Vosk
Open-source offline speech recognition toolkit for mobile devices and servers
- Also known as
- vosk
What is Vosk?
A lightweight speech recognition toolkit that works offline and supports over 20 languages. It provides real-time transcription with small models (50 MB) optimized for devices ranging from Raspberry Pi to large clusters.
Vosk pricing
We don't have Vosk's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
What Vosk does
The capabilities that matter for speech to text, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Real time streaming
- ✓
- Speaker diarization
- -
- Custom vocabulary
- ✓
- Fine tuning
- -
- Word timestamps
- -
- Punctuation formatting
- -
- Pii redaction
- -
- Vertical model
- -
- Offline on device
- ✓
- Open source
- ✓
Platform & deployment
Independently observed- iOS
- Linux
- Android
- Self-hosted
Integrations (18)
Independently observed- Asterisk
- Freeswitch
- Jigasi
- ROS
- openFrameworks
- Opencast
- IBus
- GStreamer
- nerd-dictation
- dicio-android
- openaudiosearch
- LVTerminal
- Dexter
- numenvoice
- JustSayIt
- OpenVoiceOS
- CaptionIt
- voice_perception
Security & compliance
Known vulnerabilities: 0 (0 in the last 12 months) sourcea count reflects scale & disclosure, not quality
Vosk FAQ
Common questions about Vosk, answered from independent, dated evidence.
What is Vosk?
Vosk enables voice-to-text conversion that runs locally without internet connectivity, supporting over 20 language variants with portable models suitable for mobile and embedded systems. It provides real-time streaming capabilities and allows dynamic vocabulary adjustment. It is indexed under Speech To Text.
Source: https://alphacephei.com/vosk/
What platforms does Vosk support?
Vosk supports Linux, iOS and Android. Platforms we have not confirmed are simply not listed here rather than ruled out.
Source: https://alphacephei.com/vosk/
Can Vosk be self-hosted?
Yes. Vosk can be deployed on-premise and self-hosted, so it does not have to run on the vendor's infrastructure.
Source: https://alphacephei.com/vosk/
What does Vosk integrate with?
We have confirmed 18 integrations for Vosk, including Asterisk, Freeswitch, Jigasi, ROS, openFrameworks, Opencast, IBus and GStreamer, plus 10 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.
Source: https://alphacephei.com/vosk/
Is Vosk open source?
Yes. Vosk is published under the Apache-2.0 licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.
Vosk alternatives
Other speech to text we track, ranked by the same independent score.
- AssemblyAIAPI platform for converting audio to text and building voice-powered applicationsmedium · 73%
- SpeechmaticsSpeech recognition API for voice-driven applications and AI assistantsmedium · 54%
- Deepgrammedium · 55%
- whisper.cppRun speech transcription offline on any hardwarelow · 34%
- faster-whisperA faster, open-source implementation of speech-to-text transcriptionlow · 33%
- Amazon TranscribeConvert spoken audio and video into text using cloud-based automatic speech recognitionlow · 45%
Compare Vosk
Side by side against other speech to text, attribute by attribute, with a source on every value.
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Vosk, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Release cadence | 72 | 0.08 | 5.8 | ✓ |
| Capabilities | 67 | 0.08 | 5.4 | ✓ |
| Stars | 79 | 0.05 | 3.7 | ✓ |
| Development activity | 19 | 0.14 | 2.6 | ✓ |
| Integrations | 37 | 0.05 | 2.0 | ✓ |
| Dependent projects | 38 | 0.05 | 2.0 | ✓ |
| Security score | 33 | 0.05 | 1.8 | ✓ |
| Security posture | 0 | 0.12 | 0.0 | - |
| Package downloads | 0 | 0.04 | 0.0 | - |
| Developer Q&A activity | 0 | 0.14 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 3 | mediumsource · 2026-10-15 · 65% |
Adoption
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 5 items | mediumsource · 2026-09-10 · 67% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Open source, Custom vocabulary, Offline on device, Real time streaming | mediumsource · 2026-10-15 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 18 | mediumsource · 2026-08-20 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | Jupyter Notebook | highsource · 2026-10-15 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | Apache-2.0 | highsource · 2026-10-15 · 95% |
Pricing
Release
Security
Is Vosk the right choice for you?
Tell us the job, the constraints and what you weigh most, and we will rank Vosk against the rest of the speech to text we index, using the same dated evidence weighted your way.
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