head to head · open source
calibre vs gradle-play-publisher
calibre has 26,327 GitHub stars, 2,743 forks, 6 open issues and last shipped yesterday. gradle-play-publisher has 4,323 stars, 351 forks, 22 open issues and last shipped 20 days ago. calibre leads on adoption by 509% (26,327 vs 4,323 stars). calibre is written in Python under GPL-3.0; gradle-play-publisher is written in Kotlin under MIT. calibre has attracted 10% as many forks as stars, gradle-play-publisher 8%. calibre was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| calibre | gradle-play-publisher | |
|---|---|---|
| GitHub stars | ★ 26K | ★ 4.3K |
| License | GPL-3.0 | MIT |
| Written in | Python | Kotlin |
| Last push | 2026-11-02 | 2026-10-14 |
| Forks | ⑂ 2.7K | ⑂ 351 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick calibre if
- You weight community size — 26K stars and counting
- You want the GPL-3.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick gradle-play-publisher if
- You want the gradle-play-publisher feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Kotlin
- You evaluated both and gradle-play-publisher fits your workflow better
About calibre
calibre calibre is an e book manager. It can view, convert, edit and catalog e books in all of the major e book formats. It can also talk to e book reader devices. It can go out to the internet and fetch metadata for your books. It can download newspapers and convert them into e books for convenient reading. It is cross platform, running on Linux, Windows and macOS. For more information, see the calibre About page. Screenshots Screenshots page Usage See the User Manual. Development Setting up a development environment for calibre. A tarball of the source code for the current calibre release. Bugs Bug reports and…
read the full calibre overview →
About gradle-play-publisher
Gradle Play Publisher Gradle Play Publisher (GPP) is Android's unofficial release automation Gradle Plugin. It can do anything from building, uploading, and then promoting your App Bundle or APK to publishing app listings and other metadata. Project status: maintenance mode Issues are ignored, but pull requests are not. If you need to get something done, submit a PR! Table of contents 1. Quickstart guide 2. Prerequisites 1. Initial Play Store upload 2. Signing configuration 3. Service Account 3. Basic setup 1. Installation 2. Authenticating Gradle Play Publisher 4. Task organization 5. Managing artifacts 1…
read the full gradle-play-publisher overview →
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Frequently asked questions
Is calibre or gradle-play-publisher more popular?
calibre has 26,327 GitHub stars and gradle-play-publisher has 4,323. calibre has the larger community by that measure.
Are calibre and gradle-play-publisher free?
Both are open source. calibre is licensed under GPL-3.0 and gradle-play-publisher under MIT. Neither carries a licence fee.
What is the difference between calibre and gradle-play-publisher?
calibre is written in Python and gradle-play-publisher in Kotlin. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, calibre or gradle-play-publisher?
Choose calibre if you want the larger community (26,327 stars) or its GPL-3.0 licence terms. Choose gradle-play-publisher if its feature set, stack or MIT licence fits better. Both are self-hostable.