# AssemblyAI vs Vosk

**Leader by vioscaleAI score:** AssemblyAI

| Attribute | AssemblyAI | Vosk |
|---|---|---|
| **vioscaleAI score** | 77.8 (73% (medium)) | 47.5 (39% (low)) |
| activity.commits_last_30d | - | 3 |
| adoption.dependent_repos | - | 183 |
| adoption.github_stars | - | 15,174 |
| content.faq | `[{"answer":"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. It is indexed under Speech To Text.","source":"https://www.assemblyai.com/blog/lower-latency-new-pricing","question":"What is AssemblyAI?","confidence":0.6},{"answer":"AssemblyAI offers a free tier, so you can start without paying. Paid plans start at $0.37. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.","source":"https://www.assemblyai.com/blog/lower-latency-new-pricing","question":"Is AssemblyAI free?","confidence":0.6},{"answer":"We have confirmed browser-based access to AssemblyAI. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.","source":"https://www.assemblyai.com/blog/lower-latency-new-pricing","question":"What platforms does AssemblyAI support?","confidence":0.6},{"answer":"Yes. AssemblyAI can be deployed cloud / SaaS and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://www.assemblyai.com/blog/lower-latency-new-pricing","question":"Can AssemblyAI be self-hosted?","confidence":0.6},{"answer":"We have confirmed 5 integrations for AssemblyAI, including Semantic Kernel .NET, Vercel AI SDK, OpenAI GPT-5.6 Luna, OpenAI GPT-5.6 Terra and Google Gemini. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://www.assemblyai.com/blog/lower-latency-new-pricing","question":"What does AssemblyAI integrate with?","confidence":0.6},{"answer":"We have independently confirmed SOC 2, HIPAA and GDPR for AssemblyAI. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as AssemblyAI not holding them. Always confirm compliance directly before you rely on it.","source":"https://www.assemblyai.com/blog/assemblyai-obtains-soc2-type-2-compliance-for-2022-2023","question":"What security certifications does AssemblyAI have?","confidence":0.7},{"answer":"AssemblyAI is available worldwide. Its primary markets are the United States and the United Kingdom.","source":"https://www.assemblyai.com/blog/lower-latency-new-pricing","question":"Where is AssemblyAI available?","confidence":0.75}]` | `[{"answer":"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/","question":"What is Vosk?","confidence":0.6},{"answer":"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/","question":"What platforms does Vosk support?","confidence":0.6},{"answer":"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/","question":"Can Vosk be self-hosted?","confidence":0.6},{"answer":"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/","question":"What does Vosk integrate with?","confidence":0.6},{"answer":"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.","source":"https://github.com/alphacep/vosk-api","question":"Is Vosk open source?","confidence":0.95}]` |
| deployment.options | `{"cloud":true,"self_hosted":true}` | `{"self_hosted":true}` |
| description.long | A hosted service offering speech-to-text transcription across 99 languages with real-time and batch processing, speaker identification, sentiment analysis, and infrastructure for building voice agents. | 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. |
| features.capabilities | `{"pii_redaction":true,"word_timestamps":true,"custom_vocabulary":true,"real_time_streaming":true,"speaker_diarization":true,"punctuation_formatting":true}` | `{"open_source":true,"custom_vocabulary":true,"offline_on_device":true,"real_time_streaming":true}` |
| integrations.count | 8 | 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":"Semantic Kernel","native":true,"category":"development","direction":"outbound"},{"name":"LangChain","native":true,"category":"framework"},{"name":"Twilio","native":false,"category":"communications"},{"name":"OpenAI","native":false,"category":"llm"},{"name":"Fireworks","native":false,"category":"infrastructure"},{"name":"AWS Bedrock","native":false,"category":"infrastructure"},{"name":"MiniMax","native":false,"category":"llm"},{"name":"Google Cloud Storage","native":false,"category":"storage"}]` | `[{"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":"hybrid","plans":[{"free":true,"name":"Free","contactSales":false,"includedLimits":{"streaming_hours_per_month":"333","pre_recorded_hours_per_month":"185"}},{"free":false,"name":"Pay-as-you-go","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.45,"currency":"USD"}],"contactSales":false},{"free":false,"name":"Enterprise","description":"Custom volume pricing and terms","contactSales":true}],"summary":"Free tier with limited hours; pay-as-you-go from $0.45/hr","currency":"USD","freeTier":true,"sourceUrl":"https://www.assemblyai.com/pricing","retrievedAt":"2026-09-29T10:45:03.934Z","startingPrice":{"unit":"hour","amount":0.45,"currency":"USD"}}` | `{"type":"open_source","sourceUrl":"https://alphacephei.com/vosk/","retrievedAt":"2026-10-15T20:28:01.876Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | freemium | open_source |
| pricing.price_level | low | free |
| pricing.starting_price | `{"amount":0.45,"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.certifications | `[{"name":"SOC 2 Type 2","level":"Type II","status":"active","auditor":"independent third-party"}]` | - |
| security.disclosure_policy | yes | - |
| security.gdpr | yes | - |
| security.hipaa | yes | - |
| security.pci | yes | - |
| security.scorecard | - | 3.3 |
| security.soc2 | yes | - |
| security.trust_center | https://www.assemblyai.com/security | - |
| 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: vioscaleAI. Generated 2026-10-16T02:06:49.697Z. "-" = undocumented, not absent.*