--- title: "vosk-api vs dia2" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/alphacep-vosk-api-vs-nari-labs-dia2" tools: ["alphacep-vosk-api", "nari-labs-dia2"] --- # vosk-api vs dia2 *GraphCanon updated Jul 30, 2026* ## Verdict Pick vosk-api when vosk-api is primarily Jupyter Notebook; dia2 is Python; pick dia2 when dia2 is primarily Python; vosk-api is Jupyter Notebook. [vosk-api](https://github.com/alphacep/vosk-api) reports 15k GitHub stars, 1.7k forks, and 600 open issues, last pushed Jul 2, 2026. [dia2](https://github.com/nari-labs/dia2) has 1.2k stars, 99 forks, and 5 open issues, last pushed Nov 29, 2025. Figures are from public GitHub metadata via [vosk-api's repository](https://github.com/alphacep/vosk-api) and [dia2's repository](https://github.com/nari-labs/dia2). | | [vosk-api](/tools/alphacep-vosk-api.md) | [dia2](/tools/nari-labs-dia2.md) | | --- | --- | --- | | Tagline | Offline speech recognition API | TTS model capable of streaming conversational audio in real-time. | | Stars | 15,013 | 1,160 | | Forks | 1,740 | 99 | | Open issues | 600 | 5 | | Language | Jupyter Notebook | Python | | Adopt for | Vosk-api is an offline speech recognition toolkit enabling continuous large-vocabulary transcription for over 20 languages, fitting onto small devices while offering speaker identification. | - | | Persona | - | - | | Runtime | - | - | | License | Apache-2.0 | Apache-2.0 | | Categories | Speech & Audio | Speech & Audio | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [vosk-api](/tools/alphacep-vosk-api.md) | [dia2](/tools/nari-labs-dia2.md) | | --- | --- | --- | | Maintenance | Active (82%) | Slowing (36%) | | Days since push | 27d | 243d | | Open issues (now) | 600 | 5 | | Full report | [trust report](/tools/alphacep-vosk-api/trust.md) | [trust report](/tools/nari-labs-dia2/trust.md) | ## Decision facts: vosk-api - **Adopt for:** Vosk-api is an offline speech recognition toolkit enabling continuous large-vocabulary transcription for over 20 languages, fitting onto small devices while offering speaker identification. ## Choose when ### Choose vosk-api if… - vosk-api is primarily Jupyter Notebook; dia2 is Python. - Tags unique to vosk-api: android, asr, deep-learning, deeplearning. - When offline operation is required as Vosk operates without internet connection ### Choose dia2 if… - dia2 is primarily Python; vosk-api is Jupyter Notebook. - Tags unique to dia2: open-weight, text-to-speech. - When you need real-time streaming capabilities for text-to-speech applications. ## When NOT to use vosk-api - When the project requires real-time transcription with high accuracy, possibly surpassing Vosk's performance limitations - For projects limited to languages not currently supported by Vosk's model lineup - If the application necessitates a cloud solution or benefits from regular over-the-air updates and improvements ## When NOT to use dia2 - For projects aimed at batch processing or non-realtime TTS applications where instantaneous audio output isn't required. - If you are looking for an open-source model that does not include specific proprietary components like the Kyutai Mimi codec. ## Common questions ### What is the difference between vosk-api and dia2? vosk-api: Offline speech recognition API. dia2: TTS model capable of streaming conversational audio in real-time.. See the comparison table for live GitHub stats and shared categories. ### When should I choose vosk-api over dia2? Choose vosk-api over dia2 when vosk-api is primarily Jupyter Notebook; dia2 is Python; Tags unique to vosk-api: android, asr, deep-learning, deeplearning; When offline operation is required as Vosk operates without internet connection. ### When should I choose dia2 over vosk-api? Choose dia2 over vosk-api when dia2 is primarily Python; vosk-api is Jupyter Notebook; Tags unique to dia2: open-weight, text-to-speech; When you need real-time streaming capabilities for text-to-speech applications. ### When should I avoid vosk-api? When the project requires real-time transcription with high accuracy, possibly surpassing Vosk's performance limitations For projects limited to languages not currently supported by Vosk's model lineup If the application necessitates a cloud solution or benefits from regular over-the-air updates and improvements ### When should I avoid dia2? For projects aimed at batch processing or non-realtime TTS applications where instantaneous audio output isn't required. If you are looking for an open-source model that does not include specific proprietary components like the Kyutai Mimi codec. ### Is vosk-api or dia2 more popular on GitHub? vosk-api has more GitHub stars (15,013 vs 1,160). Stars measure visibility, not whether either tool fits your constraints. ### Are vosk-api and dia2 open source? Yes - both are open-source projects on GitHub (vosk-api: Apache-2.0, dia2: Apache-2.0). ### Where can I find alternatives to vosk-api or dia2? GraphCanon lists graph-backed alternatives at [vosk-api alternatives](/tools/alphacep-vosk-api/alternatives) and [dia2 alternatives](/tools/nari-labs-dia2/alternatives) ([vosk-api markdown twin](/tools/alphacep-vosk-api/alternatives.md), [dia2 markdown twin](/tools/nari-labs-dia2/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/alphacep-vosk-api-vs-nari-labs-dia2.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, vosk-api or dia2? vosk-api: Active. dia2: Slowing. 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 vosk-api and dia2? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [vosk-api trust report](/tools/alphacep-vosk-api/trust); [dia2 trust report](/tools/nari-labs-dia2/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=alphacep-vosk-api`](/api/graphcanon/graph?tool=alphacep-vosk-api) - 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/_