head to head · open source
ebook2audiobook vs substance
ebook2audiobook has 20,495 GitHub stars, 1,748 forks, 4 open issues and last shipped 1 months ago. substance has 2,737 stars, 121 forks, 41 open issues and last shipped 7 months ago. ebook2audiobook leads on adoption by 649% (20,495 vs 2,737 stars). ebook2audiobook is written in Python under Apache-2.0; substance is written in JavaScript under MIT. ebook2audiobook has attracted 9% as many forks as stars, substance 4%. ebook2audiobook 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
| ebook2audiobook | substance | |
|---|---|---|
| GitHub stars | ★ 20K | ★ 2.7K |
| License | Apache-2.0 | MIT |
| Written in | Python | JavaScript |
| Last push | 2026-10-06 | 2026-04-02 |
| Forks | ⑂ 1.7K | ⑂ 121 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ebook2audiobook if
- You weight community size — 20K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick substance if
- You want the substance feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and substance fits your workflow better
About ebook2audiobook
📚 ebook2audiobook (E2A) CPU/GPU Converter from E Book to audiobook with chapters and metadata using advanced TTS engines and much more. Supports voice cloning and 1158 languages! [!IMPORTANT] This tool is intended for use with non DRM, legally acquired eBooks only. The authors are not responsible for any misuse of this software or any resulting legal consequences. Use this tool responsibly and in accordance with all applicable laws. Thanks to support ebook2audiobook developers! Run locally Run Remotely GUI Interface Click to see images of Web GUI Demos New Default Voice Demo More Demos ASMR Voice Rainy Day…
read the full ebook2audiobook overview →
About substance
Substance.js Substance is a JavaScript library for web based content editing. It provides building blocks for realizing custom text editors and web based publishing system. It is developed to power our online editing platform Substance. Development Install the dev dependencies. Run the dev server. Navigate to for the running the browser test suite. The test suite is rebuilt as you make changes to the source files. To run the test suite headless.
read the full substance overview →
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Frequently asked questions
Is ebook2audiobook or substance more popular?
ebook2audiobook has 20,495 GitHub stars and substance has 2,737. ebook2audiobook has the larger community by that measure.
Are ebook2audiobook and substance free?
Both are open source. ebook2audiobook is licensed under Apache-2.0 and substance under MIT. Neither carries a licence fee.
What is the difference between ebook2audiobook and substance?
ebook2audiobook is written in Python and substance in JavaScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, ebook2audiobook or substance?
Choose ebook2audiobook if you want the larger community (20,495 stars) or its Apache-2.0 licence terms. Choose substance if its feature set, stack or MIT licence fits better. Both are self-hostable.