An Actual Morse Code Trainer — Not Just A Morse Code Generator
About this app
Introduction Ham radio ops who like QRP will sooner or later want to learn Morse code so they can communicate using CW. This app teaches amateur radio enthusiasts how Morse code works and helps them build their speed.
Custom-Tailored Lessons You set your current level of proficiency and what you aim for (e.g. all letters with 20 words per minute). Dahdidahdit guides you from where you are to where you want to be — It teaches you new letters when you are ready and increases your speed when you seem bored.
Requirements The only things you need (other than a phone and the app) are a sheet of paper and a pen.
Usage When you start the session, Dahdidahdit plays Morse code letters so you can determine which speed you are comfortable with. You jot down the letters you recognized. When the session ends, Dahdidahdit shows you what it sent and you compare notes. Then you tap the button that shows the number of mistakes.
Automated Curriculum When you complete enough practice sessions with only a few mistakes, Dahdidahdit starts the next lesson, by introducing a new letter or by increasing the speed.
Additional Features
• Learning Q-codes
• Sending practice using either an on-screen or an actual paddle connected by USB
• Morse QSOs via internet with Morserino or Dahdidahdit users
• Game: Morse Tennis
Licensed under GPL-3.0-only.
What's New in v1.19.0
Imported from the F-Droid repository index.
- • Very low values for word length, WPM and effective WPM are allowed. (#35)
- • The QSO generator can generate POTA QSOs. (#37)
Version history
Jun 22, 2026 · 3.1 MB · Android API 24–36 · code 1190001
Imported from the F-Droid repository index.
- • Very low values for word length, WPM and effective WPM are allowed. (#35)
- • The QSO generator can generate POTA QSOs. (#37)
SHA-256 1ba200f9b11e19a65a3f6aa14f2e136f4c21291049ebc4299e1287b7d315873a
Feb 24, 2026 · 3.1 MB · Android API 24–36 · code 1180002
Imported from the F-Droid repository index.
SHA-256 d37226eef0e18a574eaff11fdc70c6fc009c35c0deea4977d25d752396d4f8a2
Jan 6, 2026 · 3.1 MB · Android API 24–36 · code 1170001
Imported from the F-Droid repository index.
- • User-selected theme (dark, bright, system)
- • User-selected on-screen paddles (large, normal)
- • Drilling of user-selected letters in custom training.
SHA-256 8a50f03e897bb1dbfd2fc1917fcaa32f81d2a996aa92ff3d09d071a93cba6797
Will it run on your device?
92%
- Runs on a broad range of modern Android versions.
- Multiple CPU architectures are covered.
- 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 com.paddlesandbugs.dahdidahdit 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, 1.18.0 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Dahdidahdit — The Morse Trainer 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 Dahdidahdit — The Morse Trainer, and a listing is removed when the evidence for it stops holding up.
Get Dahdidahdit — The Morse Trainer
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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
1ba200f9b11e19a65a3f6aa14f2e136f4c21291049ebc4299e1287b7d315873a
Signing certificate
b52ddde7cf27eff6ebc57ee796dabb30415f21d120d616018d00dc0e2ba8e21d
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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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