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Themes / Apps / Mods [App]Galaxy Max Hz (Refresh Rate Mods, Screen-off Mods and More)

About this app:
Refresh Rate Control: Easily control the max refresh rate (Hz) of android devices with multiple refresh rates (e.g. note20 ultra, s20/S20+/S20Ultra, z fold 2, s21/s21+/s21Ultra, tab S7/S7+). This app can limit max refresh rate to 96hz (or any available refresh rate) on supported smartphones - you can save power with negligible difference on smoothness. Use either the in-app toggle or quick settings tile - ADB setup or Root NOT needed.
Switch to High: Option to use High(Fixed) motion smoothness mode on Samsung devices with native Adaptive motion smoothness***
Current Samsung smartphones natively supporting adaptive refresh rates:
Galaxy Note 20 Ultra
Galaxy Z Fold 2
Galaxy S21, S21+, S21 Ultra
Refresh Rate Monitor: Observe how multiple refresh rates work on your device. Use either the in-app toggle or quick settings tile
Quick Resolution Switcher: Easily switch to any supported resolutions using the included quick setting tile***
Quick High/Adaptive on Power Saving Mode: Easily switch to high or adaptive motion smoothness mode (from Standard) even on power saving mode on supported Samsung smartphones.***
Force to Lowest Hz: Force lowest refresh rate on screen-off/AOD. This overrides Samsung's strange stock behavior which sets the refresh rate to the highest on screen off (update: it is now at 60hz since oneui3.0) - to improve standby power consumption a bit - ADB setup or Root NOT needed.
Auto apply power saving mode during screen-off***
Tasker plugin support: Automate GMH settings using Tasker plugin support. Supported actions/variables: Max Refresh Rate, Keep Motion Smoothness on PSM, Motion Smoothness Mode, Quick-doze Mod, Change Screen Resolution.
Ad-Free Exclusive Features:​
Keep motion smoothness when power saving mode is enabled - either manually or by the system/adaptive power saving***
Adaptive refresh rate mod: Experimental adaptive refresh rate mod for devices supporting multiple refresh rates but do not have the native Adaptive motion smoothness (e.g. S20 series, S20FE, TabS7/S7+, A52, A72)***
Quick-doze mod: Quick doze mode during screen-off to improve standby power consumption***
Set minimum refresh rate for adaptive mode to 60hz or lower (if available)***
Resolution switcher filter: Filter what screen resolutions to include for the resolution switcher QS tile.
Statusbar net speed indicator
7-day Ad-Free Trial is available. Just click "Activate Ad-free" button and activate free trial when prompted.
***these marked features require one-time ADB setup (this is not root)
Download link , FAQs and more info in original xda thread

v7.10.00 in-app update now available!
tribalfs said:
v7.10
- Custom max hz option for power saving mode- Automate GMH settings using Tasker plugin support. Supported actions/variables: Max Refresh Rate, Keep Motion Smoothness on PSM, Motion Smoothness Mode, Quick-doze Mod, Change Screen Resolution.- Some code refactoring and optimizations
Click to expand...
Click to collapse

v7.10.21 in-app update now available
- Bug fixesv7.10 changes- Separate Max hz setting for power saving mode- Automate GMH settings using Tasker plugin support. Supported actions/variables: Max Refresh Rate, Keep Motion Smoothness on PSM, Motion Smoothness Mode, Quick-doze Mod, Change Screen Resolution. Check FAQs for the basic setup guide.- Some code refactoring and optimizationsNote: Clear app's data if experiencing any issues

Isn't it possible to get the screen damaged/worn out, when its switching the refresh basically every couple of seconds?

SkylinesHD said:
Isn't it possible to get the screen damaged/worn out, when its switching the refresh basically every couple of seconds?
Click to expand...
Click to collapse
I don't think so as long as it's switching only between supported refresh rates.

v7.12 in-app update now available
- More customizable maintenance window interval for Quick-Doze Mode
v7.11
- Added turn-off autosync option under screen-off mods

v7.14.00 in-app update now available.
tribalfs said:
v7.14
Added Auto SENSORS OFF (experimental non-root workaround): Device sensors will automatically turn off while screen is off until the device is unlocked. With tasker support so you can enable and disable this setting on the conditions you set.
Click to expand...
Click to collapse
tribalfs said:
v7.13
Anti-flicker: added minimum brightness threshold for Adaptive mod similar to the native one. When the device's display brightness falls below the set minimum brightness threshold, adaptive mod will pause and will resume once the brightness increases again above the threshold. This is for devices who are experiencing flickers when refresh rate switches at certain low brightness level.Stability and bug fixes
Click to expand...
Click to collapse

v7.14.10 in-app update now available
-48hz on force lowest on screen off/AOD now works on S20/+/Ultra on any refresh rate mode-improvements on brightness threshold for adaptive mod performance(anti-flicker)-added quick settings tille to toggle min hz for adaptive mod on supported devices-added tasker option to toggle min hz for adaptive mod on supported devices-other fixes
v7.14
Added Auto SENSORS OFF (experimental non-root workaround): Device sensors will automatically turn off while screen is off until the device is unlocked. With tasker support so you can enable and disable this setting on the conditions you set.

Thanks for your work, gonna test with my A72 as soon as it arrives

v7.14.18 in app update
Fixed bugs on OneUi4.0: brightness threshold for adaptive mod bug, netspeed indicator bug
Fixed bug on minimum hz tile and minimum hz tile tasker command
Minor layout and tile improvements
Auto dim refresh rate overlay when not changing after few seconds
Fixed crashes on netspeed indicator
v7.14.17
Workaround for auto sensors off for OneUI4.0. Prior method was already blocked in A12.
Experimental workaround: enabling High/Adaptive on PSM on OneUI4.0 (not working on some models)
Fixed: setting min hertz for adaptive (%lhz) using Tasker not working

Question Quick toggle or widget toggling 60/120 Hz

Hi all,
does anyone know if there is a possibility to get a quick toggle (quick settings) or maybe a widget to quickly toggle between 120 and 60 Hz refresh rate?
Thx in advance

kniffo80 said:
Hi all,
does anyone know if there is a possibility to get a quick toggle (quick settings) or maybe a widget to quickly toggle between 120 and 60 Hz refresh rate?
Thx in advance
Click to expand...
Click to collapse
the only way i would know is to set 60Hz in power saving mode and toggle it like that
i found two other ways also, one is this
[App]Galaxy Max Hz (Refresh Rate Mods, Screen-off Mods, QS Tiles, Tasker Support and More)
About this app: Refresh Rate Mods Change default refresh rates -Easily change the overall refresh rate settings of devices supporting multiple refresh rates. -Set supported mid refresh rates as the maximum refresh rate limit for battery...
forum.xda-developers.com
and one is a macrodroid script you can search on the internet.

I've just added 2 macrodroid macros in "example" section.
You can search for "120 Hz" and you'll find my two macros, that can be imported in your list.
One forces user_refresh_rate to 120
The other one forces to 1
Just edit the "event" part, adding a macrodroid bar (which is the toggle added in quick settings panel by macrodroid app itself).
Save!!
Quit macrodroid and Open quick settings panel.
Edit it's toggles list, adding macrodroid bar you just created.
It will add a tile like in the attached pic and when you press it 120hz will be forced apply, like when you press the 120 option in display setting

Themes / Apps / Mods [App]Galaxy Max Hz (Refresh Rate Mods, Screen-off Mods, QS Tiles, Tasker Support and More)

{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
About this ap:
Refresh Rate Mods
Change default refresh rates
-Easily change the overall refresh rate settings of devices supporting multiple refresh rates.
-Set supported mid refresh rates as the maximum refresh rate limit for battery savings (e.g. 96hz instead of 120Hz).
-Quick settings shortcut
-Tasker plugin support
Motion smoothness mode switcher(Normal, Adaptive or High)***
-Set you device motion smoothness mode to stationary refresh rates (high mode) for better smoothness if so desired on Samsung devices with native Adaptive motion smoothness with a little trade-off to the battery.
-Apply adaptive mod on device that don't natively support adaptive mode [premium]
-Tasker plugin support
Per-app refresh rate settings:
Set different refresh rate settings for every app either adaptive or fixed(stationary) [premium].
Motion smoothness on power saving mode
-GMH will apply a workaround to bypass 60Hz limitation on Power Saving Mode (PSM) on supported Samsung smartphones.
-Automatically apply workaround when PSM is enabled [premium]
Need extra steps starting OneUI5.* except when rooted with magisk and using lsposed(experimental). Test it first
Screen-off Mods:
Force to Lowest Hz
-Force the lowest refresh rate on screen-off or Always-On Display(AOD) to improve standby power consumption a bit.
-Select refresh rate to set for AOD/screen-off[premium]
-Tasker plugin support.
Auto apply power saving mode during screen-off ***
Auto disable Autosync***
Quick-doze mod
-Quickly enter doze mode during screen-off that can not be interrupted by motion [premium]***
-Tasker plugin support
Auto SENSORS OFF (experimental non-root workaround)
-Device sensors will automatically turn off while screen is off until the device is unlocked to help minimize battery-draining motion-triggered wakelocks while device is not being used [premium]
-Tasker plug-in support
- Supports up to OneUI4.* only
Others
Battery protection mod (Experimental)
-Option to set maximum charge to 86%-95%(for OneUI4+)[premium]
Customizable refresh rate monitor
-Use statusbar or overlay which you can place anywhere on screen.
-Tasker plugin support
Net speed statusbar indicator
OneUI inspired UI. Dynamic theme and Icon. Manual language selection
Note: The premium license is on a per device basis (not per user).
***these marked features require a one-time ADB procedure (this is not root)
Galaxy Max Hz background service is highly optimized. Background battery usage p is very negligible .
Info:
This app targets older android sdk in order to control refresh rates without ADB setup or root. Just tap OK the dialog that says "This app was built for an older version of Android...." when opened for the first time. If OK button is not visible, just tap the blank space on the lowest portion of the dialog.
If google play protect will prompt during install that the app is built for older version of android and doesn't include the latest privacy protections, you can ignore it and proceed to the installation. For privacy related concern, please refer to FAQ No. 3.
Download
v8.0.0
Changelogs
Github wiki
Localization/Translations ​Contributors
Italian: @Orlaf
German:devj3ns, drbeat
Russian: @a43
Swedish:Steffe2
Turkish: osmanakar312
Greek: Nick
Spanish: @Sebastiansm
Czech: @Chrono Leggionaire
Simplified Chinese: @xiaolu7233123
French: @Jaxom84
Polish: @Pichulec
If you want to contribute on translations, please send me a message

Great that you've brought support to fold 4! I have small issue, it is randomly setting me on standard instead of adaptive,before I do any changes in settings (apart from ash obviously). Any ideas? Thanks!

morley636 said:
Great that you've brought support to fold 4! I have small issue, it is randomly setting me on standard instead of adaptive,before I do any changes in settings (apart from ash obviously). Any ideas? Thanks!
Click to expand...
Click to collapse
Maybe triggered by power saving mode being turned on?

It looks totally different on my fold 4? It's like stuck on adaptive but seems to be letting me set per app rate.
Does the screen off 10 work with aod?

Smittyzz said:
It looks totally different on my fold 4? It's like stuck on adaptive but seems to be letting me set per app rate.
Does the screen off 10 work with aod?
Click to expand...
Click to collapse
We don't have the Z Fold4 to test yet but it should be since Z Fold4 is capable of 10Hz.

the problem with 10Hz is that all apps (instagram, reddit etc) that shows videos are stuttering, so I need to use 24-120hz on those apps.

tribalfs said:
We don't have the Z Fold4 to test yet but it should be since Z Fold4 is capable of 10Hz.
Click to expand...
Click to collapse
I more less was thinking if the aod holds the screen on 24/7 if the 10hz lock still happens?
Looking to save battery if I can loli need aod on due to media controls with the phone "off"
Either way thanks

[email protected] said:
the problem with 10Hz is that all apps (instagram, reddit etc) that shows videos are stuttering, so I need to use 24-120hz on those apps.
Click to expand...
Click to collapse
Yes, that's a known limitation of GMH when setting min hz to 10Hz (for these apps which are restored from backup or not installed directly from play store).
For device like ZFold4, It's recommended to keep default min refresh rate to 24Hz and just use the per app settings to adjust individual app refresh rate settings to your liking..

Hey, thank you very much for this amazing app!
Two Issues:
I can just choose between "standard" and "adaptive" mode. The "high" option is greyed out. Why is that, and how can I use high mode?
I can't use the Tasker plugin. I can just add the plugin, but the edit button doesn't show the configurations. Am I doing this wrong?
Questions:
Can you add a QS tile/toggle for "PSM when screen is off"?
the option to limit the refresh rate while tying is just 60Hz, why can't this be lower like 10-24Hz?
At the top of the app it shows the device and says the model, Android 12, but it says "OneUi4.5", but it's on "OneUi4.1.1."
Thank you very much for your help

Mr6P said:
Hey, thank you very much for this amazing app!
Two Issues:
I can just choose between "standard" and "adaptive" mode. The "high" option is greyed out. Why is that, and how can I use high mode?
I can't use the Tasker plugin. I can just add the plugin, but the edit button doesn't show the configurations. Am I doing this wrong?
Questions:
Can you add a QS tile/toggle for "PSM when screen is off"?
the option to limit the refresh rate while tying is just 60Hz, why can't this be lower like 10-24Hz?
At the top of the app it shows the device and says the model, Android 12, but it says "OneUi4.5", but it's on "OneUi4.1.1."
Thank you very much for your help
Click to expand...
Click to collapse
What version of the app you installed?
And what is the exact model number of your device?
Thank you.
That OneUI4.5 version is a bit strange. That value is actually read from a field in OneUI's Build class.

tribalfs said:
What version of the app you installed?
And what is the exact model number of your device?
Thank you.
That OneUI4.5 version is a bit strange. That value is actually read from a field in OneUI's Build class.
Click to expand...
Click to collapse
It says: Version 8.0.0, I set it to alpha update channel. It doesn't say "beta" like in your screenshot here
In settings app, it says: SM-F936B/DS
I don't understand the One UI version either
I bought premium, and it also says that it's activated
------------------------
EDIT: I cleared cache & data and installed the most recent version from GitHub. Now the "high" mode is available again.
I've set up Adaptive to 24-96Hz. Now I have a weird bug, that locks the front screen to 24-60Hz and on the main screen it's correct 24-96Hz. No PSW or anything.
I don't know how to use the Tasker plugin. When I open it, then it just shows a long block of text, (see attached screenshot). There's an edit button (pencil icon) at the top right, but pressing it does nothing. Is there any configurator or even an (G)UI? Or how am I supposed to use the plugin?
Thank you very much

Hi there. Despite changing the update channel to beta, I cannot get the beta version of the app. Tried clearing cache and data several times but still no success. Any idea? I also bought a license. Thought that was the issue but still no update to beta. Helps please? Really wan to use high refresh in PSM. THANKS.

"Keep Smoothness on PSM" is missing on OneUI 5 beta, G998B.

LeeXDA18 said:
"Keep Smoothness on PSM" is missing on OneUI 5 beta, G998B.
Click to expand...
Click to collapse
I'm on oneui 4.1.1

Just reporting that the per-app settings master toggle seems to be ignored. I set my device globally from 10 Hz to 120 Hz and found that YouTube would fall down to 10 Hz when playing videos rather than 24 Hz (which also shouldn't happen). I rectified that by setting YouTube alone to 24 Hz - 120 Hz, but forgot to activate the master toggle for per-app settings. When I switched to YouTube however, it was now working correctly. It wasn't until later that I discovered that I never changed that setting, and testing with it both enabled and disabled seem to have no impact on the behavior. Only completely resetting the individual setting for the YouTube app restored the original (buggy) behavior.

Mr6P said:
...
------------------------
EDIT: I cleared cache & data and installed the most recent version from GitHub. Now the "high" mode is available again.
...
Click to expand...
Click to collapse
Great!
Mr6P said:
..
I've set up Adaptive to 24-96Hz. Now I have a weird bug, that locks the front screen to 24-60Hz and on the main screen it's correct 24-96Hz. No PSW or anything.
..
Click to expand...
Click to collapse
Seems Samsung set higher brightness threshold for 96hz on the front screen which disables 96hz on low brightness condition. Unfortunately, this is beyond control of GMH or any third party app.
Mr6P said:
I don't know how to use the Tasker plugin. When I open it, then it just shows a long block of text, (see attached screenshot). There's an edit button (pencil icon) at the top right, but pressing it does nothing. Is there any configurator or even an (G)UI? Or how am I supposed to use the plugin?
Thank you very much
Click to expand...
Click to collapse
Please check #16 in FAQs.
Thank you.

jooniloh said:
Just reporting that the per-app settings master toggle seems to be ignored. I set my device globally from 10 Hz to 120 Hz and found that YouTube would fall down to 10 Hz when playing videos rather than 24 Hz (which also shouldn't happen). I rectified that by setting YouTube alone to 24 Hz - 120 Hz, but forgot to activate the master toggle for per-app settings. When I switched to YouTube however, it was now working correctly.
Click to expand...
Click to collapse
I believe that the installed youtube app was restored from backup and then subsequently updated from play store.
This is related to the limitation I mentioned here. Thank you.
tribalfs said:
Yes, that's a known limitation of GMH when setting min hz to 10Hz (for these apps which are restored from backup or not installed directly from play store).
For device like ZFold4, It's recommended to keep default min refresh rate to 24Hz and just use the per app settings to adjust individual app refresh rate settings to your liking..
Click to expand...
Click to collapse

tribalfs said:
I believe that the installed youtube app was restored from backup and then subsequently updated from play store.
This is related to the limitation I mentioned here. Thank you.
Click to expand...
Click to collapse
I understand that youtube not correctly applying 24 Hz falls under the limitation you mentioned, however shouldn't setting the per-app profile for youtube to 24 Hz minimum, but not having the master per-app toggle on not alter youtube's behavior at all from the global behavior set?

jooniloh said:
I understand that youtube not correctly applying 24 Hz falls under the limitation you mentioned, however shouldn't setting the per-app profile for youtube to 24 Hz minimum, but not having the master per-app toggle on not alter youtube's behavior at all from the global behavior set?
Click to expand...
Click to collapse
No, global behavior for apps detected as video player is 24hz min unless higher min hz is set as default.

tribalfs said:
No, global behavior for apps detected as video player is 24hz min unless higher min hz is set as default.
Click to expand...
Click to collapse
I get that, but with the GLOBAL setting set to 10-120, and the master per-app toggle OFF--meaning NO settings within per-app settings should affect behavior--YouTube falls down to 10 Hz during playback when the YouTube per-app setting is left cleared, but correctly plays back at 24 Hz when its per-app setting is set to a minimum of 24 Hz. Why is YouTube's per-app setting having an affect on refresh rate within the YouTube app when the master per-app toggle is set to off?

Themes / Apps / Mods [App]Galaxy Max Hz (Refresh Rate Mods, Screen-off Mods and More)

App Features
Refresh Rate Mods
Change default refresh rates
-Easily change the overall refresh rate settings of devices supporting multiple refresh rates.
-Set supported mid refresh rates as the maximum refresh rate limit for battery savings (e.g. 96hz instead of 120Hz).
-Quick settings shortcut
-tasker plugin support.
Motion smoothness mode switcher(Normal, Adaptive or High)***
-Apply adaptive mod on device that don't natively support adaptive mode [premium]
-Tasker plugin support.
Per-app refresh rate settings:
Set different refresh rate settings for every app either adaptive or fixed(stationary) [premium].
Motion smoothness on power saving mode (not working to all devices with OneUI4.**+, test first). ***
-GMH will apply a workaround to bypass 60Hz limitation on Power Saving Mode (PSM) on supported Samsung smartphones.
-Automatically apply workaround when PSM is enabled [premium]
Screen-off Mods:
Force to Lowest Hz: Force the lowest refresh rate on screen-off or Always-On Display(AOD). This overrides Samsung's strange stock behavior which sets the refresh rate to the highest on screen off (update: it is now at 60hz since OneUI3.0) to improve standby power consumption a bit.
-Tasker plugin support
Auto apply power saving mode during screen-off (after ~ 10 secs)***
Auto disable Autosync***
Quick-doze mod
-Quickly enter doze mode during screen-off that can not be interrupted by motion [premium].***
-Tasker plugin support
Auto SENSORS OFF (experimental non-root workaround)
-Device sensors will automatically turn off while screen is off until the device is unlocked to help minimize battery-draining motion-triggered wakelocks while device is not being used.
-Tasker plug-in support
- Supports up to android 12 only
Others
Battery protection mod
-Option to set maximum charge to 86%-95%(for OneUI4+)[premium]
Quick resolution switcher
-Easily switch to any supported resolutions using the included quick setting tile***
-Tasker plugin support
Customizable refresh rate monitor
-Use statusbar or overlay which you can place anywhere on screen.
-Tasker plugin support.
Net speed statusbar indicator
OneUI inspired UI. Dynamic theme and Icon. Manual language selection
Note: The premium license is on a per device basis (not per user).
***these marked features require a one-time ADB procedure (this is not root)
Galaxy Max Hz background service is highly optimized. Background battery usage p is very negligible .
Info: This app targets older android sdk in order to control refresh rates without ADB setup or root. Just tap OK the dialog that says "This app was built for an older version of Android...." when opened for the first time. If OK button is not visible, just tap the blank space on the lowest portion of the dialog.
Download
v8.0.0
Changelogs
Github wiki

Localization/Translations ​Contributors
Italian: @Orlaf
German:devj3ns, drbeat
Russian: @a43
Swedish:Steffe2
Turkish: osmanakar312
Greek: Nick
Spanish: @Sebastiansm
Czech: @Chrono Leggionaire
Simplified Chinese: @xiaolu7233123
French: @Jaxom84
Polish: @Pichulec
If you want to contribute on translations, please send me a message
If you want to get GMH Premium features and/or support GMH development but paypal is not available in your place, you can use Google Play Store.
Just download GMH Donation app from Google Play Store.
Note: The price might be slightly higher due to the relatively higher tax imposed on play store.

Been using it for a while now, it's great! Totally recommended.

I can't get adaptive hz on the phone it's greyed out

Themes / Apps / Mods [App]Galaxy Max Hz (Refresh Rate Mods, Screen-off Mods, QS Tiles, Tasker Support and More)

About this app:
Refresh Rate Mods
Change default refresh rates
- Easily change the overall refresh rate settings of devices supporting multiple refresh rates.
- Set separate refresh rates for power saving mode and for low battery state [1]
- Quick settings shortcut
- Tasker plugin support
Refresh rate (motion smoothness) mode switcher(Normal, Adaptive or High)[2]
- Set you device motion smoothness mode to static refresh rates (high mode) for better smoothness if so desired
- Tasker plugin support
Per-app refresh rate settings:
-Set different refresh rate settings for every app either adaptive or static [1]
Keep selected refresh rate mode on power saving mode[1]
- On devices with One4 or lower, GMH will automatically apply a workaround to bypass 60Hz limit on Power Saving Mode.
- Need extra steps on OneUI5.* except when using magisk and lsposed(experimental). Test it first.
Screen-off Mods:
Screen off/AOD refresh rate (Force to Lowest Hz)
- Force the lowest refresh rate on screen-off or Always-On Display(AOD)
- Tasker plugin support
- Select custom refresh rate for AOD/screen-off [1]
Auto apply power saving mode during screen-off [2]
Auto disable Autosync
Quick-doze mod
- Quickly enter doze mode (than usual) during screen-off that can not be interrupted by motion with customizable maintenance window interval [1][2]
- Tasker plugin support
Auto SENSORS OFF (non-root workaround)
- Device sensors will automatically turn off while screen is off until the device is unlocked to help minimize battery-draining motion-triggered wakelocks while device is not being used [premium]
- Tasker plug-in support
- Supports up to OneUI4.* only
Others
Battery protection mod
- Option to set maximum charge to 86%-95%(for OneUI4+)/40%-95% if rooted [1][2]
Quick resolution switcher
- Easily switch to any supported resolutions using the included quick setting tile[2]
- Tasker plugin support
Customizable refresh rate monitor
- Use statusbar or overlay which you can place anywhere on screen.
- Tasker plugin support
Animation mod
Net speed statusbar indicator
OneUI inspired UI.
[1] Enabled for premium users (with 2 days premium trial)
[2] These features require WRITE_SECURE_SETTINGS permission granted thru a one-time ADB procedure (this is not root)
Info:
This app targets older android sdk in order to control refresh rates without ADB setup or root. Just tap OK the dialog that says "This app was built for an older version of Android...." when opened for the first time. If OK button is not visible, just tap the blank space on the lowest portion of the dialog. If google play protect prompts during install that the app is built for older version of android and doesn't include the latest privacy protections, you can ignore it and proceed to the installation. For privacy related concern, please refer to FAQ No. 3.
Download and changelogs
Github wiki

--reserved--