Hard facts side by side: free tiers, prices, limits, SDKs and privacy. Every value links to the official page it came from and is re-checked every week.
| Fact |  AssemblyAI |
|---|---|
| Free tier | Trial credits $50 in free credits at signup, no credit card required. Source, Sep 29, 2026 |
| Starting price | $0.15 per hour Universal-2 pre-recorded speech-to-text (Universal-3.5 Pro: $0.21/hr). Source, Sep 29, 2026 |
| Rate limit | 5 concurrent transcriptions Free accounts, async; paid accounts get 200+. Source, Sep 29, 2026 |
| Size limit | 5 GB / 10 hours per file Transcript endpoint; direct uploads via /v2/upload capped at 2.2 GB. Source, Sep 29, 2026 |
| Storage |
|---|
| Transcripts kept ~30 days Async audio deleted within 24-48 hours; transcript deletion begins at 30 days. Source, Sep 29, 2026 |
| Official SDKs | PythonJavaScript / TypeScriptSource, Sep 29, 2026 |
|---|
| Trains on your data | Opt-out Certain PII-redacted files used for training unless opted out, on a BAA, or using EU servers. Source, Sep 29, 2026 |
|---|
| EU hosting | Yes EU endpoint api.eu.assemblyai.com keeps data in the EU. Source, Sep 29, 2026 |
|---|
| Compliance | SOC 2ISO 27001Source, Sep 29, 2026 |
|---|
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