Audio Oscilloscope and Spectrum
About this app
An audio oscilloscope and spectrum.
* Timebase 0.1 ms - 0.5 sec * Sync control * Single shot * Storage * Index * Spectrum
There are toolbar icons to control single step, sync timebase, storage and scrolling. The spectrum display has a display lock function and shows the current dominant frequency and signal level in the toolbar.
Licensed under GPL-3.0-only, by Bill Farmer.
What's New in v1.39
Imported from the F-Droid repository index.
- * Use executor for background tasks
- * Update SDK, build tools
Version history
Mar 27, 2026 · 0.1 MB · Android API 23–35 · code 139
Imported from the F-Droid repository index.
- * Use executor for background tasks
- * Update SDK, build tools
SHA-256 aca6069254339bff2d4d078541287eb7c33da75724506a5f99c02fbb4fa42f41
Nov 26, 2023 · 0.1 MB · Android API 23–30 · code 138
Imported from the F-Droid repository index.
- * Add THD calculation
SHA-256 deec480e940a881dad367cda42c7af0ef3b241e9dd4e9d35f0c69e9d6eebabf6
Nov 5, 2023 · 0.1 MB · Android API 21–28 · code 137
Imported from the F-Droid repository index.
- * Update icons
SHA-256 a5fc2f1522d373aecad5f892b97da7eaefe2c40cd544eabe5a366508f66bffe5
Will it run on your device?
78%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be org.billthefarmer.scope is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 1.38 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Oscilloscope first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Oscilloscope, and a listing is removed when the evidence for it stops holding up.
Get Oscilloscope
Every source we list for org.billthefarmer.scope is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
aca6069254339bff2d4d078541287eb7c33da75724506a5f99c02fbb4fa42f41
Signing certificate
fd5234e89e82d2834a24df14c0ef4ac34589eb70ba6a374dd9fb29aa9dda8c0c
Permissions Required
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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