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Vosk

alphacephei.com

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Spec score 8.4 #15 of 46 in AI transcription tools

What it is

Vosk is an open-source toolkit for speech recognition that works offline, including on devices such as Raspberry Pi, Android, and iOS. It supports more than 20 languages and dialects and includes a streaming API. Developers can reconfigure vocabulary; most small models support dynamic changes. Small models are typically around 50 MB and need about 300 MB of runtime memory, while large server models can require up to 16 GB. Language bindings include Python, Java, C#, and JavaScript, among others. Vosk Server has implementations for WebSocket, gRPC, MQTT, and WebRTC, and listed integrations include Asterisk, FreeSWITCH, Jigasi, and UniMRCP. The server can be installed with Docker and configured to use a locally mounted model folder. Listed systems include Linux x86_64 and arm64, Raspberry Pi 3/4, macOS x86 and M1, and Windows x86 and 64 for the Python package. ARMv6 and Windows ARM64 are unsupported; iOS builds are available on request. The API repository lists an Apache-2.0 license.

Spec sheet

Product
Vosk is a speech recognition toolkit for offline speech recognition.Read 11 Oct 2026 · alphacephei.com
Intended users
The FAQ describes Vosk as a practical, plug-and-play speech recognition library for applications, while suggesting Kaldi for research.Read 11 Oct 2026 · alphacephei.com
Deployment
The server can be installed with Docker and configured to use a locally mounted model folder.Read 11 Oct 2026 · alphacephei.com
Integrations
The integrations page lists Asterisk, FreeSWITCH, Jigasi, and UniMRCP integrations.Read 11 Oct 2026 · alphacephei.com
Support
The project directs users to GitHub issues, email, Telegram, and an invitation-only WeChat group for questions.Read 11 Oct 2026 · alphacephei.com
License
The Vosk API GitHub repository identifies its license as Apache-2.0.Read 11 Oct 2026 · github.com
API access
YesRead 20 Sep 2026 · alphacephei.com
Developer interfaces
The project provides bindings for Python, Java, C#, and JavaScript, among other languages.Read 11 Oct 2026 · alphacephei.com
Export formats
TXT,SRTRead 20 Sep 2026 · alphacephei.com
Languages
The toolkit supports more than 20 languages and dialects.Read 11 Oct 2026 · alphacephei.com
Model sizes
Small models are typically around 50 MB and require about 300 MB of runtime memory; large server models can require up to 16 GB.Read 11 Oct 2026 · alphacephei.com
Offline use
Vosk works offline, including on lightweight devices such as Raspberry Pi, Android, and iOS.Read 11 Oct 2026 · alphacephei.com
Platform limits
The installation page says ARMv6 and Windows ARM64 are not supported, and iOS builds are available on request.Read 11 Oct 2026 · alphacephei.com
Server protocols
Vosk Server has implementations for WebSocket, gRPC, MQTT, and WebRTC.Read 11 Oct 2026 · alphacephei.com
Speaker identification
Vosk supports speaker identification alongside speech recognition.Read 11 Oct 2026 · alphacephei.com
Speaker identification
YesRead 20 Sep 2026 · alphacephei.com
Streaming
Vosk provides a streaming API for speech recognition.Read 11 Oct 2026 · alphacephei.com
Supported systems
The installation page lists Linux x86_64, Linux arm64, Raspberry Pi 3/4, macOS x86 and M1, and Windows x86 and 64 for its Python package.Read 11 Oct 2026 · alphacephei.com
Timestamp support
YesRead 20 Sep 2026 · alphacephei.com
Vocabulary
Vosk allows vocabulary reconfiguration, and its models page says most small models support dynamic vocabulary changes.Read 11 Oct 2026 · alphacephei.com

Plans and prices

Vosk Open Source Free offline speech recognition · mobile and server · 10 platforms Read 11 Oct 2026 · alphacephei.com

Every Vosk plan and price →

Strong points and limits

Strong points

  • Works offline, including on lightweight devices
  • Supports more than 20 languages and dialects
  • Streaming API and configurable vocabulary
  • Bindings include Python, Java, C#, and JavaScript

Limits

  • ARMv6 and Windows ARM64 are unsupported
  • iOS builds are available on request
  • Large server models can require up to 16 GB

Who it suits

Vosk suits developers building applications that need offline or streaming speech recognition. Its FAQ presents it as a practical library for applications and points to Kaldi for research.

Verdict

Vosk offers offline recognition with streaming, vocabulary changes, and several developer interfaces. Model memory needs vary substantially, and some system targets have stated limits.

Where Specifiction places it

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