Hammer
Hammer is a free, open-source notes app for Android and iOS. A simple tool for building stories. It has 769 GitHub stars and is released under the MIT license, and you can install it from F-Droid, Google Play and the App Store.
github.com/Darkrock-Studios/hammer-editor (opens in a new tab)
- Android
- iOS
- Desktop
- Jetpack Compose
- Notes & to-do
- Actively maintained
About Hammer
Please join our Discord to report issues! Multi-platform This app is where ever you are. Your phone, tablet, desktop, laptop, this program can be installed and run, not simply a website-in-a-box, but instead using native client side technologies to provide the best experience possible. Offline first I was frustrated with most of the story writing software I was finding as they were using web technologies (aka: Web Page in a box) which always seems to run into problems while being used offline for long periods of time. Hammer is designed from the ground up to be entirely local, no internet connection required, ever. Transparent Data Your data is yours.
Privacy and F-Droid
F-Droid builds Hammer from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.
No anti-features flagged on the latest F-Droid build.
Screenshots
Screenshots from the app's F-Droid listing.
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What is Hammer?
Hammer is a free, open-source notes app for Android and iOS. A simple tool for building stories. It has 769 GitHub stars and is released under the MIT license, and you can install it from F-Droid, Google Play and the App Store.
Is Hammer free and open source?
Yes. Hammer's source code is public on GitHub under the MIT license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.
How do I install Hammer?
You can install Hammer from F-Droid (package com.darkrockstudios.apps.hammer.android), from Google Play and from the App Store; the links are on this page. Its GitHub repository also publishes releases (latest: v3.12.0).
Is Hammer still maintained?
The repository's most recent commit was on Oct 6, 2026. Its F-Droid listing was last updated on Aug 26, 2026. appsgit only lists apps whose repository had a commit in the last six months.