--- title: "fastrtc vs RealtimeTTS" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/gradio-app-fastrtc-vs-koljab-realtimetts" tools: ["gradio-app-fastrtc", "koljab-realtimetts"] --- # fastrtc vs RealtimeTTS *GraphCanon updated Jul 29, 2026* ## Verdict Pick fastrtc when fastrtc is primarily JavaScript; RealtimeTTS is Python; pick RealtimeTTS when realtimeTTS is primarily Python; fastrtc is JavaScript. [fastrtc](https://fastrtc.org/) reports 4.6k GitHub stars, 434 forks, and 79 open issues, last pushed Jan 12, 2026. [RealtimeTTS](https://github.com/KoljaB/RealtimeTTS) has 4.0k stars, 399 forks, and 125 open issues, last pushed May 31, 2026. Figures are from public GitHub metadata via [fastrtc's repository](https://github.com/gradio-app/fastrtc) and [RealtimeTTS's repository](https://github.com/KoljaB/RealtimeTTS). | | [fastrtc](/tools/gradio-app-fastrtc.md) | [RealtimeTTS](/tools/koljab-realtimetts.md) | | --- | --- | --- | | Tagline | The python library for real-time communication | Converts text to speech in realtime | | Stars | 4,619 | 4,002 | | Forks | 434 | 399 | | Open issues | 79 | 125 | | Language | JavaScript | Python | | Adopt for | fastrtc is a Python library offering real-time communication capabilities such as pause detection and text-to-speech. | - | | Persona | - | - | | Runtime | - | - | | License | MIT | MIT | | Categories | Speech & Audio | Speech & Audio | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [fastrtc](/tools/gradio-app-fastrtc.md) | [RealtimeTTS](/tools/koljab-realtimetts.md) | | --- | --- | --- | | Maintenance | Slowing (36%) | Steady (60%) | | Days since push | 197d | 58d | | Open issues (now) | 79 | 125 | | Owner type | Organization | User | | Full report | [trust report](/tools/gradio-app-fastrtc/trust.md) | [trust report](/tools/koljab-realtimetts/trust.md) | ## Shared compatibility - **Python**: [fastrtc](/tools/gradio-app-fastrtc.md) - Python runtime; [RealtimeTTS](/tools/koljab-realtimetts.md) - Python runtime ## Decision facts: fastrtc - **Adopt for:** fastrtc is a Python library offering real-time communication capabilities such as pause detection and text-to-speech. ## Choose when ### Choose fastrtc if… - fastrtc is primarily JavaScript; RealtimeTTS is Python. - Tags unique to fastrtc: artificial-intelligence, hacktoberfest, hacktoberfest2025, llm. - Use fastrtc for projects that require pause detection in audio streams as it provides the specific ReplyOnPause feature. ### Choose RealtimeTTS if… - RealtimeTTS is primarily Python; fastrtc is JavaScript. - Tags unique to RealtimeTTS: realtime, speech-synthesis. - Use RealtimeTTS when you need to integrate real-time text-to-speech capabilities into a Python application that requires immediate audio output without delays. ## When NOT to use fastrtc - Avoid fastrtc when the project requires real-time communication features not covered by its pause detection or text-to-speech services. - Do not use fastrtc if support for multiple languages beyond what Python and this library's built-in features provide is necessary. ## When NOT to use RealtimeTTS - Avoid using RealtimeTTS in scenarios where pre-recorded or highly customized voice outputs are crucial, given its focus on speed over customization options. - Do not use RealtimeTTS if heavy reliance on external cloud services is a requirement, since it emphasizes local execution for performance. ## Common questions ### What is the difference between fastrtc and RealtimeTTS? fastrtc: The python library for real-time communication. RealtimeTTS: Converts text to speech in realtime. See the comparison table for live GitHub stats and shared categories. ### When should I choose fastrtc over RealtimeTTS? Choose fastrtc over RealtimeTTS when fastrtc is primarily JavaScript; RealtimeTTS is Python; Tags unique to fastrtc: artificial-intelligence, hacktoberfest, hacktoberfest2025, llm; Use fastrtc for projects that require pause detection in audio streams as it provides the specific ReplyOnPause feature. ### When should I choose RealtimeTTS over fastrtc? Choose RealtimeTTS over fastrtc when RealtimeTTS is primarily Python; fastrtc is JavaScript; Tags unique to RealtimeTTS: realtime, speech-synthesis; Use RealtimeTTS when you need to integrate real-time text-to-speech capabilities into a Python application that requires immediate audio output without delays. ### When should I avoid fastrtc? Avoid fastrtc when the project requires real-time communication features not covered by its pause detection or text-to-speech services. Do not use fastrtc if support for multiple languages beyond what Python and this library's built-in features provide is necessary. ### When should I avoid RealtimeTTS? Avoid using RealtimeTTS in scenarios where pre-recorded or highly customized voice outputs are crucial, given its focus on speed over customization options. Do not use RealtimeTTS if heavy reliance on external cloud services is a requirement, since it emphasizes local execution for performance. ### Is fastrtc or RealtimeTTS more popular on GitHub? fastrtc has more GitHub stars (4,619 vs 4,002). Stars measure visibility, not whether either tool fits your constraints. ### Are fastrtc and RealtimeTTS open source? Yes - both are open-source projects on GitHub (fastrtc: MIT, RealtimeTTS: MIT). ### Where can I find alternatives to fastrtc or RealtimeTTS? GraphCanon lists graph-backed alternatives at [fastrtc alternatives](/tools/gradio-app-fastrtc/alternatives) and [RealtimeTTS alternatives](/tools/koljab-realtimetts/alternatives) ([fastrtc markdown twin](/tools/gradio-app-fastrtc/alternatives.md), [RealtimeTTS markdown twin](/tools/koljab-realtimetts/alternatives.md)), 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](/compare/gradio-app-fastrtc-vs-koljab-realtimetts.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, fastrtc or RealtimeTTS? fastrtc: Slowing. RealtimeTTS: 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 fastrtc and RealtimeTTS? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [fastrtc trust report](/tools/gradio-app-fastrtc/trust); [RealtimeTTS trust report](/tools/koljab-realtimetts/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=gradio-app-fastrtc`](/api/graphcanon/graph?tool=gradio-app-fastrtc) - LLM index: [/llms.txt](/llms.txt) - Full corpus: [/llms-full.txt](/llms-full.txt) _GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_