Alpha Cephei

license

Apache-2.0(OSI

source

public

core features withheld

yes — Alpha Cephei sells Vosk Enterprise and Vosk Mobile tiers with more languages, premium-accuracy models and iOS and Unity support that the open-source edition does not carry

The Vosk engine is Apache-2.0 and builds from the published repository. Alpha Cephei also sells Enterprise and Mobile editions that add languages, higher-accuracy models and platforms the open-source release lacks, so the open code is not the whole product.

• https://alphacephei.com/en/ recorded 2026-09-27

  Alpha Cephei products: "Vosk Enterprise more languages premium accuracy ongoing support technology training"; "Vosk Mobile more languages efficiency for the edge iOS and Unity".

• https://raw.githubusercontent.com/alphacep/vosk-api/master/COPYING recorded 2026-09-27

  COPYING body: "Apache License" / "Version 2.0, January 2004".

• https://raw.githubusercontent.com/alphacep/vosk-api/master/README.md recorded 2026-09-27

  README: "Vosk scales from small devices like Raspberry Pi or Android smartphone to big clusters."

PyPI downloads of the vosk package; the Android, Java and Node bindings install through other registries not counted here.

• https://pypistats.org/api/packages/vosk/recent recorded 2026-09-27

  "last_month":572791 for vosk.

A dependable offline recognizer that runs almost anywhere, but it serves one task on Kaldi-era models, two steps below NeMo.

• https://alphacephei.com/vosk/models recorded 2026-09-27

  Models page: "You can check Vosk recipe for details: https://github.com/alphacep/vosk-api/tree/master/training".

• https://raw.githubusercontent.com/alphacep/vosk-api/master/README.md recorded 2026-09-27

  README: "It enables speech recognition for 20+ languages and dialects"; "zero-latency response with streaming API, reconfigurable vocabulary and speaker identification."