6 Best ChatTTS Alternatives in 2026 (Open Source)
ChatTTS β A generative speech model for daily dialogue. Purpose-built for dialogue TTS with fine-grained control over prosody (laughter, pauses, interjections) that most TTS models lack β trained on 100K+ hours, with multi-speaker and streaming support, but deliberately limited for safety
Short answer
- Closest match to ChatTTS: EmotiVoice.
- Most actively developed: Pipecat (2,861 commits in the last 90 days).
- Fastest growing: agents (+1,358 GitHub stars in the last 30 days).
- No commit in 6+ months: AudioGPT and RealChar.
These 6 open-source tools do the same job. They are ordered by how closely they match ChatTTS, with live GitHub data so you can see which projects are actively maintained.
| Tool | GitHub stars | Stars / 30d | Last commit |
|---|---|---|---|
| ChatTTS(original) | 39.9k | +141 | 2026-04-10 |
| EmotiVoice | 8.5k | +12 | 2026-09-03 |
| IndexTTS-2.5 | 24.3k | +736 | 2026-09-29 |
| AudioGPT | 10.2k | -7 | 2023-05-05 |
| RealChar | 6.2k | +1 | 2024-02-03 |
| agents | 14.4k | +1,358 | 2026-10-01 |
| Pipecat | 16.1k | +833 | 2026-10-02 |
1. EmotiVoice
EmotiVoice π: a Multi-Voice and Prompt-Controlled TTS Engine
What sets it apart: vs standard TTS engines: prompt-controlled emotional synthesis across 2000+ voices β 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
2. IndexTTS-2.5
An Industrial-Level Controllable and Efficient Zero-Shot Text-To-Speech System
What sets it apart: 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
Best for: High-quality zero-shot TTS with emotion control; Video dubbing with precise duration matching; Research on expressive speech synthesis
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
4. RealChar
Create and converse with customizable AI characters in real time on web, mobile, and terminal
What sets it apart: vs Character.AI: fully open-source with voice cloning, multi-platform (web+iOS+phone), and pluggable LLM/TTS backends β own your AI characters
Best for: Building interactive AI character experiences with voice; Developers creating multi-platform conversational AI personas
5. agents
A framework for building realtime voice AI agents π€ποΈπΉ
What sets it apart: The leading open-source framework for realtime voice AI agents with WebRTC infrastructure, semantic turn detection, multi-agent handoff, and native telephony β vs alternatives that bolt voice onto text-first frameworks
Best for: Building production voice AI agents and assistants; Real-time conversational AI with telephony integration; Multi-agent voice workflows with handoffs
6. Pipecat
Open Source framework for voice and multimodal conversational AI
What sets it apart: Only production-grade framework for real-time voice AI with composable pipelines β supports 17+ STT and 20+ TTS providers with ultra-low latency, unlike text-focused agent frameworks
Best for: Building real-time voice AI agents and assistants; Multimodal conversational interfaces with audio, video, and text
FAQ
- What are the best alternatives to ChatTTS?
- The closest open-source alternatives to ChatTTS are EmotiVoice, IndexTTS-2.5 and AudioGPT, followed by RealChar, agents and Pipecat. They are ranked by how closely they match what ChatTTS does.
- Which ChatTTS alternative is the most popular?
- IndexTTS-2.5 has the most GitHub stars among ChatTTS alternatives, with 24,262 stars.
- Which ChatTTS alternative is the most actively maintained?
- By recent activity, Pipecat (2,861 commits in the last 90 days) is the most actively developed alternative.