# Kaldi vs Speechmatics

**Leader by Vioscale score:** Speechmatics

| Attribute | Kaldi | Speechmatics |
|---|---|---|
| **Vioscale score** | 17.8 (15% (low)) | 81.4 (55% (medium)) |
| activity.commits_last_30d | 0 | - |
| adoption.dependent_repos | 1 | - |
| adoption.github_stars | 15,469 | - |
| deployment.options | `{"cloud":true,"self_hosted":true}` | `{"cloud":true,"hybrid":true,"on_prem":true,"self_hosted":true}` |
| description.long | A free, open-source framework for building and deploying speech recognition systems, supporting multiple platforms from desktop to mobile and in-browser execution. | Speech recognition and synthesis platform offering real-time and batch transcription, audio analysis, and text-to-speech across 55+ languages. Supports flexible deployment with privacy-first design and compliance-ready infrastructure. |
| features.capabilities | - | `{"fine_tuning":true,"vertical_model":true,"word_timestamps":true,"custom_vocabulary":true,"offline_on_device":true,"real_time_streaming":true,"speaker_diarization":true,"punctuation_formatting":true}` |
| integrations.count | - | 7 |
| integrations.list | - | `[{"name":"Stenograph CATalyst VP"},{"name":"Adobe Premiere"},{"name":"Zapier"},{"name":"Twilio"},{"name":"Python SDK"},{"name":"JavaScript SDK"},{"name":".NET SDK"}]` |
| language.primary | Shell | - |
| market.availability | - | `{"hqCountry":"GB","primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"mac":true,"web":true,"linux":true,"android":true,"windows":true}` | `{"cli":true,"web":true}` |
| pricing | `{"type":"open_source","freeTier":true,"sourceUrl":"https://kaldi-asr.org/","retrievedAt":"2026-08-20T12:17:47.249Z"}` | `{"type":"usage","plans":[{"free":true,"name":"Free","summary":"$100 credit, no card required","features":["Speech-to-Text (55+ languages)","Text-to-Speech (English)","Multi-region cloud options","2 concurrent real-time sessions"],"components":[{"kind":"one_time","amount":100,"currency":"USD"}],"description":"For developers and early exploration","contactSales":false,"includedLimits":{"credit":"$100","concurrent_real_time_sessions":"2"}},{"free":false,"name":"Pro","summary":"Usage-based from $0.24/hour for Real-time Standard transcription","features":["Speech-to-Text (55+ languages)","Text-to-Speech","Real-time sessions (up to 50 concurrent)","Speaker diarization","Custom vocabulary","Advanced punctuation and casing","Precise timestamps","Multi-channel support","Online email support","20% volume discount over 500 hours/month"],"commitment":"monthly","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.24,"currency":"USD"},{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.43,"currency":"USD"},{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.4,"currency":"USD"}],"description":"For demanding projects and growing needs","contactSales":false,"includedLimits":{"file_jobs_per_second":"10","concurrent_real_time_sessions":"50"}},{"free":false,"name":"Enterprise","summary":"Volume discounts, custom pricing","features":["Unlimited concurrent real-time sessions","No rate limits","Custom models and voices","Custom language development","SaaS or on-premises or on-device deployment","Privacy-first deployment options","Dedicated Customer Success Manager","Prioritized service and support"],"description":"Custom pricing with unlimited scale and flexible deployment options","contactSales":true}],"addOns":[{"name":"Model Training Discount Program","components":[{"of":"Speech-to-Text usage","kind":"percentage","rate":33}]}],"summary":"Usage-based from $0.24/hour; free tier with $100 credit; volume discounts available","currency":"USD","freeTier":true,"sourceUrl":"https://www.speechmatics.com/pricing","retrievedAt":"2026-08-25T15:40:09.401Z","startingPrice":{"unit":"hour","amount":0.24,"currency":"USD"},"billingPeriods":["month"]}` |
| pricing.free_tier | yes | yes |
| pricing.model | open_source | freemium |
| pricing.price_level | free | low |
| pricing.starting_price | - | `{"amount":0.24,"currency":"USD"}` |
| pricing.transparent | - | yes |
| security.disclosure_policy | - | yes |
| security.gdpr | - | yes |
| security.hipaa | - | yes |
| security.iso27001 | - | yes |
| security.scorecard | 3.9 | - |
| security.soc2 | - | yes |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=conda&package_name=kaldi&per_page=100","last_12m":0,"max_severity":null}` | - |

## Capabilities (Speech To Text)

| Capability | Kaldi | Speechmatics |
|---|:--:|:--:|
| **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 2026-09-01T17:02:55.611Z. "-" = undocumented, not absent.*