Comparison
OuteTTS vs FastChat
Verdict
Pick OuteTTS when tags unique to OuteTTS: llama, text-to-speech, python, tts; pick FastChat when tags unique to FastChat: evaluation system, large-language-models, chatbots, distributed serving.
Markdown twin · OuteTTS alternatives · FastChat alternatives
GraphCanon updated today
Trust & integrity
| Signal | OuteTTS | FastChat |
|---|---|---|
| Maintenance | Slowing (110d since push) As of today · github_public_v1 | Steady (71d since push) As of today · github_public_v1 |
| Provenance | Not a fork · Personal account As of today · github_public_v1 | Not a fork · Organization account As of today · github_public_v1 |
| Security (OSV) | 18 low (18 low) As of today · osv@v1 | No lockfile As of today · none |
Tagline
- OuteTTS
- Interface for OuteTTS models.
- FastChat
- An open platform for training, serving, and evaluating large language models
Stars
- OuteTTS
- 1.4k
- FastChat
- 39k
Forks
- OuteTTS
- 117
- FastChat
- 4.8k
Open issues
- OuteTTS
- 40
- FastChat
- 1.0k
Language
- OuteTTS
- Python
- FastChat
- Python
Adopt for
- OuteTTS
- -
- FastChat
- FastChat is a comprehensive open platform for managing large language models (LLMs) that includes capabilities for training, serving, evaluating, and comparing chatbot models via web UIs and RESTful APIs. It powers ChatB
Persona
- OuteTTS
- -
- FastChat
- -
Runtime
- OuteTTS
- -
- FastChat
- -
License
- OuteTTS
- Apache-2.0
- FastChat
- Apache-2.0
Last pushed
- OuteTTS
- Mar 23, 2026
- FastChat
- May 1, 2026
Categories
- OuteTTS
- Model Training, Speech & Audio, Inference & Serving
- FastChat
- Model Training, LLM Frameworks, Inference & Serving, Evaluation & Observability
Trust and health
Maintenance
- OuteTTS
- Slowing (36%)
- FastChat
- Steady (60%)
Days since push
- OuteTTS
- 110d
- FastChat
- 71d
Open issues (now)
- OuteTTS
- 40
- FastChat
- 1.0k
Owner type
- OuteTTS
- User
- FastChat
- Organization
Security scan
- OuteTTS
- 18 low (18 low)
- FastChat
- No lockfile
Full report
- OuteTTS
- Trust report
- FastChat
- Trust report
Shared compatibility
- Python · OuteTTS: Python runtime · FastChat: Python runtime
Choose OuteTTS if…
- Tags unique to OuteTTS: llama, text-to-speech, python, tts.
- Also covers Speech & Audio.
- Leaner open-issue backlog (40).
When NOT to use OuteTTS
- Last GitHub push was 110 days ago (slowing maintenance, Mar 23, 2026). Validate activity before betting a new project on OuteTTS.
- Model Training: Try prompting and RAG first; fine-tuning is the answer to style/format, not missing knowledge.
- Inference & Serving: Self-hosting rarely beats a hosted API on cost until you have steady, high-volume traffic.
Choose FastChat if…
- Tags unique to FastChat: evaluation system, large-language-models, chatbots, distributed serving.
- Also covers LLM Frameworks, Evaluation & Observability.
- - You are looking to train and evaluate state-of-the-art models such as Vicuna or MT-Bench.
When NOT to use FastChat
- - You require a proprietary or closed-source framework; FastChat is open-source under Apache-2.0 license and its use might be unsuitable for environments requiring proprietary solutions.
- - Your chatbot evaluation needs do not align with the types of data used in FastChat's datasets (e.g., human votes, MT-Bench evaluations).
- - You prefer a more user-friendly setup without the need to clone a repository and manually install dependencies; FastChat requires installation from source with additional steps for Rust and CMake on
- + Mac.
Explore
Sources
Every stat on this page traces to a dated GitHub sync, license file, enrichment field, or trust scan.
- GitHub stars (edwko/OuteTTS) · observed Jul 11, 2026
- GitHub forks (edwko/OuteTTS) · observed Jul 11, 2026
- Last push (edwko/OuteTTS) · observed Mar 23, 2026
- License file (Apache-2.0) · observed Jul 11, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
- GitHub stars (lm-sys/FastChat) · observed Jul 11, 2026
- GitHub forks (lm-sys/FastChat) · observed Jul 11, 2026
- Last push (lm-sys/FastChat) · observed May 1, 2026
- License file (Apache-2.0) · observed Jul 11, 2026
- Decision facts (enrichment) · observed Jul 11, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
GitHub stars on cards: OuteTTS 1.4k · FastChat 39k (synced Jul 11, 2026).
Common questions
- What is the difference between OuteTTS and FastChat?
- OuteTTS: Interface for OuteTTS models.. FastChat: An open platform for training, serving, and evaluating large language models. See the comparison table for live GitHub stats and shared categories.
- When should I choose OuteTTS over FastChat?
- Choose OuteTTS over FastChat when Tags unique to OuteTTS: llama, text-to-speech, python, tts; Also covers Speech & Audio; Leaner open-issue backlog (40).
- When should I choose FastChat over OuteTTS?
- Choose FastChat over OuteTTS when Tags unique to FastChat: evaluation system, large-language-models, chatbots, distributed serving; Also covers LLM Frameworks, Evaluation & Observability; - You are looking to train and evaluate state-of-the-art models such as Vicuna or MT-Bench.
- When should I avoid OuteTTS?
- Last GitHub push was 110 days ago (slowing maintenance, Mar 23, 2026). Validate activity before betting a new project on OuteTTS. Model Training: Try prompting and RAG first; fine-tuning is the answer to style/format, not missing knowledge. Inference & Serving: Self-hosting rarely beats a hosted API on cost until you have steady, high-volume traffic.
- When should I avoid FastChat?
- - You require a proprietary or closed-source framework; FastChat is open-source under Apache-2.0 license and its use might be unsuitable for environments requiring proprietary solutions. - Your chatbot evaluation needs do not align with the types of data used in FastChat's datasets (e.g., human votes, MT-Bench evaluations). - You prefer a more user-friendly setup without the need to clone a repository and manually install dependencies; FastChat requires installation from source with additional steps for Rust and CMake on + Mac.
- Is OuteTTS or FastChat more popular on GitHub?
- FastChat has more GitHub stars (39,490 vs 1,436). Stars measure visibility, not whether either tool fits your constraints.
- Are OuteTTS and FastChat open source?
- Yes - both are open-source projects on GitHub (OuteTTS: Apache-2.0, FastChat: Apache-2.0).
- Where can I find alternatives to OuteTTS or FastChat?
- GraphCanon lists graph-backed alternatives at OuteTTS alternatives and FastChat alternatives (OuteTTS markdown twin, FastChat markdown twin), ranked by typed relationship edges rather than popularity votes.
- Is there a machine-readable version of this comparison?
- Yes. The markdown twin at this comparison mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers.
- Which is better maintained, OuteTTS or FastChat?
- OuteTTS: Slowing. FastChat: Steady. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance.
- Where are the full trust reports for OuteTTS and FastChat?
- GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: OuteTTS trust report; FastChat trust report.