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PianoRain

by Daniel Tapa

Install PianoRain

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  • Tap Download anyway if the browser warns about the file
  • Allow your browser to install unknown apps if Android asks
  • Open Zapstore and finish the onboarding

Open PianoRain in Zapstore

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QR code to open PianoRain in Zapstore
  • Scan the code to open PianoRain in Zapstore, or search for it there
  • Tap Install, and Download if Zapstore asks you to confirm the developer
  • Confirm in Android’s install dialog. Allow Zapstore to install unknown apps if Android asks

Claimed by the developer

Daniel Tapa cryptographically proved they hold the key that signs PianoRain. The claim is a signed proof on Nostr, tied to the certificate below.

Developer
Daniel Tapa
Developer key
npub1j05v7rta35l68yzxd5alzsh697nulg69zzv5fqtrzkrdmk4x965qca89qy
Signing certificate
298180fea2011311d419a49b74aef281fbb7fe7608cb4318f4b965e5bc61ef2d
APK checked by
relay.zapstore.devIt read the APK and found it signed with this certificate before listing the release.
Claim published
Nov 10, 2026
Valid until
Nov 9, 2028
Proof event
d2b59c3eac044702eb7f297e327608daf465972319a210bcb894829ca806b81bin relay.zapstore.dev
How trust works

An offline Android app that plays piano recordings with falling notes and a live keyboard. Record piano audio or import a file, wait for the local transcription to finish, then open it in the player. No server or account required.

An offline Android app that plays piano recordings with falling notes and a live keyboard. Record piano audio or import a file, wait for the local transcription to finish, then open it in the player. No server or account required.

Summary generated by Zapstore from source.

Original description, as the developer published it.

Zap PianoRain

Zapping anonymously. Sign in to zap with your identity.

Sats go to npub1j05v7…ca89qy, the developer who signed the app’s certificate proof.

Amount in sats

Stacked in

Latest release

Nov 10, 2026
Claimed app No Google servicesWorks offlineSource available · Apache-2.0

It uses the microphone to record piano audio. Data stays on the phone.

Permissions

  • Notifications POST_NOTIFICATIONS Send you notifications
  • Microphone RECORD_AUDIO Record audio To record piano audio.

Release notes

First public release of PianoRain, an offline Android app for playing piano recordings with falling notes.

  • Record or import piano audio and transcribe it on the device.
  • Try three bundled 30-second demos: Chopin’s Prelude in C minor, Silken Notes, and The Entertainer.
  • Play, seek, and slow down the audio while preserving pitch.

Install

Download PianoRain-v0.1-arm64.apk from Assets and open it on your Android device. Requires Android 8.0 or later and an ARM64 device. The download is 202.9 MB and includes the offline transcription model.

SHA-256: b0a14afa4b941c02d01f145b8f770dd005bce27289a501cf5694f1d0a780a0da

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Get PianoRain the private way

Updates checked on your device, and every release verified before it installs.

Get Zapstore for Android

  1. Tap Download APK below.Scan the code with your Android phone’s camera.
  2. If Android asks, allow your browser to install unknown apps.
  3. Open Zapstore and finish the onboarding.
Download APK

v2.0.4 · 71.2 MB · Android 10+

Verify the download

On a computer, run shasum -a 256 <the file you downloaded>. It should print: b13e01319fecf0b3ba1fd60132758bd0fa08a235836c52d44fddb412cf1b7137

If you have zsp, Zapstore’s publishing tool, zsp utils extract-apk <the file you downloaded> works too. Its hash should be the same SHA-256: b13e01319fecf0b3ba1fd60132758bd0fa08a235836c52d44fddb412cf1b7137

On the phone, AppVerifier should show this signing certificate: 99e33b0c2d07e75fcd9df7e40e886646ff667e3aa6648e1a1160b036cf2b9320

Source code All releases and notes

Get zsp

  1. Download the file for your computer.
  2. Make it executable and put it on your PATH.
  3. In your project folder, run zsp.

Have Go? This does the same:

go install github.com/zapstore/zsp/v2/cmd/zsp@latest
macOS, Apple silicon Linux, x86-64 Linux, arm64

v2.0.1 · macOS and Linux

Verify the download

On your computer, run shasum -a 256 <the file you downloaded>. It should print the SHA-256 for the one you chose.

macOS, Apple silicon · 18.6 MB 99018fb9744e5ace2b44557550dc333496239912c0e9b1137266d4922c803346

Linux, x86-64 · 23.8 MB 1ef5373f8ecd9ba63d2c3fab98abb0d31b2244a2aac31b3749fb205c7d5f5b38

Linux, arm64 · 22.1 MB e421005ee47cba58293dce4277bb784e4cfe706dbbcb8617d671629d0238be18

Source code All releases and notes