compare
IndexTTS vs Piper
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | IndexTTS | Piper |
|---|---|---|
| Language | Python | C++ |
| Licence | Other | GPL-3.0 |
| Stars | 24k | 5.8k |
| Latest | v2.5.0 | v1.8.0 |
| Last push | 2026-09-29 | 2026-09-28 |
| Release cadence | about 173 days between releases | about 13 days between releases |
| Active contributors | 11 commit authors on the default branch in the last 90 days | 9 commit authors on the default branch in the last 90 days |
| Flags | none | none |
How they relate
Both replace ElevenLabs. Alternatives to ElevenLabs →
PartialIndexTTSZero-shot TTS with voice cloning and control over duration and emotion.
PartialPiperFast offline voices that run on a Raspberry Pi, without voice cloning.
Piper
- v1.8.02026-09-04Add Thai phonemizer using TLTK in the new th extra
- v1.7.02026-08-15Add Japanese phonemizer using OpenJTalk (pyopenjtalk-plus) in the new ja extra
- v1.6.12026-08-13Run the g2pW model through piper.g2pw_onnx instead of g2pw.api, dropping torch (~750 MB installed) and requests from th…
- v1.6.02026-07-23Add Hebrew phonemizer using Nakdimon
- v1.5.02026-07-17Add libpiper C++ CLI executable ported from the legacy Piper repository, plus a C++ test suite
IndexTTS
✓ signed The latest release, v2.5.0, carries a signature GitHub verified.
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Piper
unsigned The latest release, v1.8.0, carries no signature GitHub could verify.
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