3 Best IndexTTS-2.5 Alternatives in 2026 (Open Source)
IndexTTS-2.5 — An Industrial-Level Controllable and Efficient Zero-Shot Text-To-Speech System. vs F5-TTS/CosyVoice: First autoregressive TTS model with precise duration control for video dubbing, plus emotion-timbre disentanglement allowing independent control of voice identity and emotional expression - developed by Bilibili
Short answer
- Closest match to IndexTTS-2.5: ChatTTS.
- Most actively developed: EmotiVoice (1 commits in the last 90 days).
- Fastest growing: ChatTTS (+141 GitHub stars in the last 30 days).
- No commit in 6+ months: AudioGPT.
These 3 open-source tools do the same job. They are ordered by how closely they match IndexTTS-2.5, with live GitHub data so you can see which projects are actively maintained.
| Tool | GitHub stars | Stars / 30d | Last commit |
|---|---|---|---|
| IndexTTS-2.5(original) | 24.3k | +736 | 2026-09-29 |
| ChatTTS | 39.9k | +141 | 2026-04-10 |
| EmotiVoice | 8.5k | +12 | 2026-09-03 |
| AudioGPT | 10.2k | -7 | 2023-05-05 |
1. ChatTTS
A generative speech model for daily dialogue.
What sets it apart: Purpose-built for dialogue TTS with fine-grained control over prosody (laughter, pauses, interjections) that most TTS models lack — trained on 100K+ hours, with multi-speaker and streaming support, but deliberately limited for safety
Best for: Research on conversational TTS with prosodic control; Building dialogue-oriented voice interfaces (non-commercial); Chinese language TTS applications
2. EmotiVoice
EmotiVoice 😊: a Multi-Voice and Prompt-Controlled TTS Engine
What sets it apart: vs standard TTS engines: prompt-controlled emotional synthesis across 2000+ voices — the ability to specify emotion (happy, sad, angry) alongside text sets it apart from monotone alternatives
Best for: Multilingual content creation requiring emotional nuance; Voice cloning applications with custom datasets; Applications needing diverse voice options with emotional variation
3. AudioGPT
AudioGPT: Understanding and Generating Speech, Music, Sound, and Talking Head
What sets it apart: It brings speech, singing, general audio, and talking-head capabilities together in one open-source conversational system.
Best for: Researchers and developers experimenting with conversational audio understanding and generation; Projects combining multiple speech, sound, music, and talking-head models
FAQ
- What are the best alternatives to IndexTTS-2.5?
- The closest open-source alternatives to IndexTTS-2.5 are ChatTTS, EmotiVoice and AudioGPT. They are ranked by how closely they match what IndexTTS-2.5 does.
- Which IndexTTS-2.5 alternative is the most popular?
- ChatTTS has the most GitHub stars among IndexTTS-2.5 alternatives, with 39,889 stars.
- Which IndexTTS-2.5 alternative is the most actively maintained?
- By recent activity, EmotiVoice (1 commits in the last 90 days) is the most actively developed alternative.