# AssemblyAI vs Vosk

**Leader by Vioscale score:** AssemblyAI

| Attribute | AssemblyAI | Vosk |
|---|---|---|
| **Vioscale score** | 80.2 (60% (medium)) | 37.5 (28% (low)) |
| activity.commits_last_30d | - | 1 |
| adoption.dependent_repos | - | 183 |
| adoption.github_stars | - | 15,076 |
| deployment.options | `{"cloud":true}` | `{"on_prem":true,"self_hosted":true}` |
| description.long | A platform providing speech-to-text APIs for both pre-recorded and live audio, voice agent capabilities, and audio analysis features like speaker identification and sentiment analysis. Serves millions of developers with focus on accuracy and scalability. | 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. |
| integrations.count | 5 | 18 |
| integrations.list | `[{"name":"Semantic Kernel .NET"},{"name":"Vercel AI SDK"},{"name":"OpenAI GPT-5.6 Luna"},{"name":"OpenAI GPT-5.6 Terra"},{"name":"Google Gemini"}]` | `[{"name":"Asterisk"},{"name":"Freeswitch"},{"name":"Jigasi"},{"name":"ROS"},{"name":"openFrameworks"},{"name":"Opencast"},{"name":"IBus"},{"name":"GStreamer"},{"name":"nerd-dictation"},{"name":"dicio-android"},{"name":"openaudiosearch"},{"name":"LVTerminal"},{"name":"Dexter"},{"name":"numenvoice"},{"name":"JustSayIt"},{"name":"OpenVoiceOS"},{"name":"CaptionIt"},{"name":"voice_perception"}]` |
| language.primary | - | Jupyter Notebook |
| license.spdx | - | Apache-2.0 |
| market.availability | `{"primaryMarkets":["US","GB"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"web":true}` | `{"ios":true,"linux":true,"android":true}` |
| pricing | `{"type":"usage","plans":[{"free":false,"name":"Async Speech-to-Text","summary":"$0.37/hour","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.37,"currency":"USD"}],"description":"Pre-recorded audio transcription","contactSales":false},{"free":false,"name":"Real-time Speech-to-Text","summary":"$0.47/hour","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.47,"currency":"USD"}],"description":"Live audio stream transcription","contactSales":false},{"free":false,"name":"Sync Speech-to-Text","summary":"$0.45/hour","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.45,"currency":"USD"}],"description":"Same-request transcription for short clips","contactSales":false}],"addOns":[{"name":"Speaker Diarization","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.12,"currency":"USD"}]},{"name":"LLM Prompting","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.05,"currency":"USD"}]},{"name":"Voice Isolation","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.1,"currency":"USD"}]},{"name":"SSO","components":[{"kind":"fixed","amount":199,"period":"month","currency":"USD"}]}],"summary":"From $0.37/hour for async transcription. Free tier available.","currency":"USD","freeTier":true,"sourceUrl":"https://www.assemblyai.com/blog/lower-latency-new-pricing","retrievedAt":"2026-08-19T21:32:28.755Z","startingPrice":{"unit":"hour","amount":0.37,"currency":"USD"},"billingPeriods":["month"]}` | - |
| pricing.free_tier | yes | - |
| pricing.model | freemium | - |
| pricing.price_level | low | - |
| pricing.starting_price | `{"amount":0.37,"currency":"USD"}` | - |
| pricing.transparent | yes | - |
| release.cadence_days | - | 51 |
| release.history | - | `[{"url":"https://github.com/alphacep/vosk-api/releases/tag/v0.3.50","date":"2024-04-22T13:02:41Z","type":"stable","version":"v0.3.50"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/v0.3.45","date":"2022-12-14T23:05:03Z","type":"stable","version":"v0.3.45"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/v0.3.43","date":"2022-07-14T23:22:53Z","type":"stable","version":"v0.3.43"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/v0.3.42","date":"2022-05-26T13:45:56Z","type":"stable","version":"v0.3.42"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/v0.3.38","date":"2022-05-24T12:16:29Z","type":"stable","version":"v0.3.38"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/v0.3.32","date":"2021-10-30T21:57:48Z","type":"stable","version":"v0.3.32"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/v0.3.31","date":"2021-08-31T20:18:14Z","type":"stable","version":"v0.3.31"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/v0.3.30","date":"2021-07-11T07:50:48Z","type":"stable","version":"v0.3.30"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/v0.3.27","date":"2021-05-05T19:48:54Z","type":"stable","version":"v0.3.27"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/0.3.21","date":"2021-02-12T21:51:09Z","type":"stable","version":"0.3.21"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/0.3.18","date":"2021-02-07T22:22:35Z","type":"stable","version":"0.3.18"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/0.3.17","date":"2021-01-09T16:17:11Z","type":"stable","version":"0.3.17"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/0.3.16","date":"2021-01-07T23:24:13Z","type":"stable","version":"0.3.16"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/0.3.15","date":"2020-10-13T00:14:40Z","type":"stable","version":"0.3.15"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/0.3.10","date":"2020-06-29T12:47:05Z","type":"stable","version":"0.3.10"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/0.3.9","date":"2020-06-22T23:35:00Z","type":"stable","version":"0.3.9"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/0.3.7","date":"2020-05-03T19:45:52Z","type":"stable","version":"0.3.7"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/0.3.6","date":"2020-04-28T21:54:36Z","type":"stable","version":"0.3.6"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/0.3.5","date":"2020-04-22T20:30:58Z","type":"stable","version":"0.3.5"},{"url":"https://github.com/alphacep/vosk-api/releases/tag/0.3.3","date":"2020-02-27T14:59:58Z","type":"stable","version":"0.3.3"}]` |
| reliability.sla_pct | 99.9 | - |
| reliability.status_page | yes | - |
| security.disclosure_policy | yes | - |
| security.gdpr | yes | - |
| security.hipaa | yes | - |
| security.pci | yes | - |
| security.scorecard | - | 3.3 |
| security.soc2 | yes | - |
| security.vulnerabilities | - | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=vosk&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Speech To Text)

| Capability | AssemblyAI | Vosk |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Real time streaming | - | - |
| Speaker diarization | - | - |
| Custom vocabulary | - | - |
| Fine tuning | - | - |
| Word timestamps | - | - |
| Punctuation formatting | - | - |
| Pii redaction | - | - |
| Vertical model | - | - |
| Offline on device | - | - |
| Open source | - | - |

*Source: Vioscale. Generated 2026-09-01T14:44:30.648Z. "-" = undocumented, not absent.*