--- title: "whisper.cpp vs TTS" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/ggml-org-whisper-cpp-vs-mozilla-tts" tools: ["ggml-org-whisper-cpp", "mozilla-tts"] --- # whisper.cpp vs TTS *GraphCanon updated Jul 12, 2026* ## Verdict Pick whisper.cpp when whisper.cpp is primarily C++; TTS is Jupyter Notebook; pick TTS when tTS is primarily Jupyter Notebook; whisper.cpp is C++. [whisper.cpp](https://github.com/ggml-org/whisper.cpp) reports 52k GitHub stars, 5.9k forks, and 1.2k open issues, last pushed Jul 11, 2026. [TTS](https://github.com/mozilla/TTS) has 10k stars, 1.3k forks, and 38 open issues, last pushed Nov 9, 2023. Figures are from public GitHub metadata via [whisper.cpp's repository](https://github.com/ggml-org/whisper.cpp) and [TTS's repository](https://github.com/mozilla/TTS). | | [whisper.cpp](/tools/ggml-org-whisper-cpp.md) | [TTS](/tools/mozilla-tts.md) | | --- | --- | --- | | Tagline | Port of OpenAI's Whisper model in C/C++ for speech-to-text inference | :robot: :speech_balloon: Deep learning for Text to Speech (Discussion forum: https://discourse.mozilla.org/c/tts) | | Stars | 51,715 | 10,159 | | Forks | 5,898 | 1,323 | | Open issues | 1,216 | 38 | | Language | C++ | Jupyter Notebook | | Adopt for | A port of OpenAI's Whisper model to C++, optimized with `ggml`, for lightweight speech-to-text transcription. | - | | Persona | - | - | | Runtime | - | - | | License | MIT License - permissive license that allows users to use the software in any way, including closed-source applications. | MPL-2.0 | | Categories | Inference & Serving, Speech & Audio | Model Training, Speech & Audio | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [whisper.cpp](/tools/ggml-org-whisper-cpp.md) | [TTS](/tools/mozilla-tts.md) | | --- | --- | --- | | Maintenance | Very active (96%) | Dormant (18%) | | Days since push | 0d | 974d | | Open issues (now) | 1.2k | 38 | | Security scan | No lockfile | 636 low (636 low) | | Full report | [trust report](/tools/ggml-org-whisper-cpp/trust.md) | [trust report](/tools/mozilla-tts/trust.md) | ## Decision facts: whisper.cpp - **Requirements:** Requires C++ setup and knowledge; Needs audio files converted into a compatible format supported by `ggml`. - **Adopt for:** A port of OpenAI's Whisper model to C++, optimized with `ggml`, for lightweight speech-to-text transcription. - **License detail:** MIT License - permissive license that allows users to use the software in any way, including closed-source applications. ## Choose when ### Choose whisper.cpp if… - whisper.cpp is primarily C++; TTS is Jupyter Notebook. - License: whisper.cpp is MIT, TTS is MPL-2.0. - Requirements: Requires C++ setup and knowledge; Needs audio files converted into a compatible format supported by `ggml`.. - Tags unique to whisper.cpp: speech-to-text, openai, transformer, speech-recognition. - Also covers Inference & Serving. - You need a lightweight solution that does not require Python or PyTorch ### Choose TTS if… - TTS is primarily Jupyter Notebook; whisper.cpp is C++. - License: TTS is MPL-2.0, whisper.cpp is MIT. - Tags unique to TTS: gantts, deep-learning, glow-tts, python. - Also covers Model Training. ## When NOT to use whisper.cpp - When you prefer to work with higher-level languages like Python which might offer more ease-of-use and extensive libraries - If your project requires real-time speech transcription and has limited computational resources as `ggml` optimization might still require significant CPU/GPU power for high-performance ## When NOT to use TTS - Last GitHub push was 975 days ago (dormant maintenance, Nov 9, 2023). Validate activity before betting a new project on TTS. - Model Training: Try prompting and RAG first; fine-tuning is the answer to style/format, not missing knowledge. ## Common questions ### What is the difference between whisper.cpp and TTS? whisper.cpp: Port of OpenAI's Whisper model in C/C++ for speech-to-text inference. TTS: :robot: :speech_balloon: Deep learning for Text to Speech (Discussion forum: https://discourse.mozilla.org/c/tts). See the comparison table for live GitHub stats and shared categories. ### When should I choose whisper.cpp over TTS? Choose whisper.cpp over TTS when whisper.cpp is primarily C++; TTS is Jupyter Notebook; License: whisper.cpp is MIT, TTS is MPL-2.0; Requirements: Requires C++ setup and knowledge; Needs audio files converted into a compatible format supported by `ggml`.; Tags unique to whisper.cpp: speech-to-text, openai, transformer, speech-recognition; Also covers Inference & Serving; You need a lightweight solution that does not require Python or PyTorch. ### When should I choose TTS over whisper.cpp? Choose TTS over whisper.cpp when TTS is primarily Jupyter Notebook; whisper.cpp is C++; License: TTS is MPL-2.0, whisper.cpp is MIT; Tags unique to TTS: gantts, deep-learning, glow-tts, python; Also covers Model Training. ### When should I avoid whisper.cpp? When you prefer to work with higher-level languages like Python which might offer more ease-of-use and extensive libraries If your project requires real-time speech transcription and has limited computational resources as `ggml` optimization might still require significant CPU/GPU power for high-performance ### When should I avoid TTS? Last GitHub push was 975 days ago (dormant maintenance, Nov 9, 2023). Validate activity before betting a new project on TTS. Model Training: Try prompting and RAG first; fine-tuning is the answer to style/format, not missing knowledge. ### Is whisper.cpp or TTS more popular on GitHub? whisper.cpp has more GitHub stars (51,715 vs 10,159). Stars measure visibility, not whether either tool fits your constraints. ### Are whisper.cpp and TTS open source? Yes - both are open-source projects on GitHub (whisper.cpp: MIT, TTS: MPL-2.0). ### Where can I find alternatives to whisper.cpp or TTS? GraphCanon lists graph-backed alternatives at [whisper.cpp alternatives](/tools/ggml-org-whisper-cpp/alternatives) and [TTS alternatives](/tools/mozilla-tts/alternatives) ([whisper.cpp markdown twin](/tools/ggml-org-whisper-cpp/alternatives.md), [TTS markdown twin](/tools/mozilla-tts/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/ggml-org-whisper-cpp-vs-mozilla-tts.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, whisper.cpp or TTS? whisper.cpp: Very active. TTS: Dormant. 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 whisper.cpp and TTS? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [whisper.cpp trust report](/tools/ggml-org-whisper-cpp/trust); [TTS trust report](/tools/mozilla-tts/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=ggml-org-whisper-cpp`](/api/graphcanon/graph?tool=ggml-org-whisper-cpp) - 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/_