RL Filter

Find out combinations of R, L making a desired cutoff frequency

Peter Ho · com.peterhohsy.rlcircuit

Not rated yet 1K+ downloads v2.0.20 7 MB Android 6.0+ PEGI 3 · Everyone

Download APK 7 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v2.0.20 (2020)
Updated: Jul 30, 2026 (2 months ago)
APK size: 7 MB
Requires: Android 6.0+ (API 23)
CPU support: x86 32-bit, x86 64-bit, ARM 32-bit, ARM 64-bit
Category: Tools (app)
Listed since: Jul 13, 2021 (at least)
Permissions: 4
Developer contact: [email protected]

About this APK

RL Filter is an app by Peter Ho in the Tools category, listed since at least July 2021. It includes native code for x86 32-bit, x86 64-bit, ARM 32-bit and ARM 64-bit, so it runs on practically every phone.

Since version 1.8.35, the minimum Android version rose from 4.0 to 6.0. It asks for 4 permissions, none of them sensitive. It asks for the same permissions as version 2.0.15. The app offers in-app purchases through Google Play.

What's new in v2.0.20

2.0.20 - Fix minor bugs

Description

From the listing uploaded by “appupdater”.

This app is used to calculate RL filter. It is suitable for hobbyist or electronic engineers. Features: 1. Calculate cutoff frequency by resistor and inductor values 2. To find out combinations of resistance and inductance making a desired cutoff frequency 3. Save all combinations in a CSV (Excel) file 4. Use preferred values of resistors and inductors Features in PRO version only: 1. Can use preferred value 1% for resistor and 5% for inductor 2. No Ads 3. No limitation Note : 1. For those who need support please email to the designated email. Do NOT use either the feedback area to write questions, it is not appropriate and that is not guaranteed that can read them.

Version history

4 versions are listed, going back to v1.8.35. Since v2.0.20 it requires Android 6.0+.

v2.0.20 LATEST Jul 30, 2026 7 MB TRUSTED v2.0.15 Mar 25, 2026 3.6 MB TRUSTED v2.0.10 Feb 1, 2026 3.6 MB TRUSTED v1.8.35 Jun 5, 2024 2.1 MB TRUSTED

All 4 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Jul 30, 2026.
Certificate issued to “Peter Ho” This is the certificate of the Google Play version.
Same certificate as the 2 other versions checked

Store checks and file details

Developer signature verified Jul 30, 2026
Validated against Google Play Jul 30, 2026
Signed byCN=Peter Ho
Signing certificate (SHA-1)41:02:A5:4E:EF:CC:4A:31:97:6A:CF:74:8A:ED:A1:D6:58:A7:02:DC
File MD5b6fe2aeafdaaae3854131264e74d2ad4
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (4)

RL Filter requests 4 permissions, none of them sensitive.

Full network access android.permission.INTERNET
In-app purchases (Google Play Billing) com.android.vending.BILLING
Internal broadcast protection (app-defined) com.peterhohsy.rlcircuit.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Basic touch input android.hardware.faketouch

RL Filter APK: questions and answers

Is there a version of RL Filter for older Android phones?

The current version needs Android 6.0 or later. Version 2.0.15 is the newest listed build that installs on Android 5.0 and later. Get version 2.0.15 · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is RL Filter free?

The APK is free to download, but the app offers in-app purchases through Google Play.

Is the RL Filter APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 2 other versions checked. After downloading, check that the file's MD5 is b6fe2aeafdaaae3854131264e74d2ad4.