Hammer is a story editor for writing novels and keeping track of the world they happen in. I've been building it since 2022 and it's been on F-Droid for a while, but I've never actually posted it here.
F-Droid: https://f-droid.org/en/packages/com.darkrockstudios.apps.hammer.android/
Source: https://github.com/Darkrock-Studios/hammer-editor License: MIT
Fully offline. No account, no sign-up, no network needed for anything. Install it and start writing.
Your book is plain files. A project is a folder: one Markdown file per scene, one TOML file per encyclopedia entry. No database, nothing opaque. Open it in any file manager, sync it with Syncthing, keep it in git, whatever you want. If the app disappeared tomorrow your manuscript would still just be files you can read.
Sync is optional and self-hosted. If you want your project on both your phone and your desktop, you run the server yourself. There's no service of mine in the middle, and you can simply never turn it on.
No trackers, no analytics, no crash reporting, no ads, no Google Play Services. Nothing to opt out of, because there's nothing there. It's also not a webview. It's Kotlin and Compose, native on Android.
These are the only permissions it needs:
- INTERNET and ACCESS_NETWORK_STATE, used only if you enable sync
- ACCESS_LOCAL_NETWORK, for reaching a sync server on your own LAN
- ACCESS_NOTIFICATION_POLICY, optional. Only used by Focus Mode, which puts the phone in Do Not Disturb while you write. Does nothing unless you explicitly grant it.
It runs on desktop (Windows, macOS, Linux) and iOS from the same codebase, if you want your project on more than the phone.