kitio.aiWhisper vs AssemblyAI
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Whisper is completely free, while AssemblyAI is freemium.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Multilingual transcription
- Speech translation to English
- Several model sizes
- Command-line tool
- Python API
- Batch and streaming transcription
- Speaker diarization
- PII redaction
- Sentiment and topic detection
- LLM features over transcripts
| Feature | Whisper | AssemblyAI |
|---|---|---|
| Best for | OpenAI's open-source speech recognition and translation model | Speech AI API for transcription, diarization and audio understanding |
| Category | Audio & voice | Audio & voice |
| Pricing model | Free | Freemium |
| Starting price | Free | See pricing page |
| Free plan | Yes, fully free | Yes |
| Made by | OpenAI | AssemblyAI |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Whisper is completely free, while AssemblyAI is freemium.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Free
Free
- Try the API for free
- No commitment
Pay as you go
$0.21 / hr (Universal-3.5 Pro)
- Universal-2 at $0.15/hr
- Streaming from $0.45/hr
- Add-ons billed per hour
Custom
Custom
- Custom rate limits
- Higher concurrency
- Enterprise-grade flexibility
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Whisper
- Free under the MIT license
- Robust to accents and noise
- Huge ecosystem of tools
- No built-in speaker labels
- Large models need a GPU for speed
AssemblyAI
- High accuracy on English
- Rich analysis features
- Clear documentation
- Add-on features cost extra
- No end-user app
Which one should you choose?
Choose Whisper if you want:
- Free under the MIT license
- Robust to accents and noise
- Huge ecosystem of tools
Watch out: no built-in speaker labels.
Choose AssemblyAI if you want:
- High accuracy on English
- Rich analysis features
- Clear documentation
Watch out: add-on features cost extra.
Whisper vs AssemblyAI FAQ
What is the difference between Whisper and AssemblyAI?
Whisper: OpenAI's open-source speech recognition and translation model. AssemblyAI: Speech AI API for transcription, diarization and audio understanding. Both are audio & voice tools.
Is Whisper or AssemblyAI cheaper?
Whisper is completely free, while AssemblyAI is freemium.
Do Whisper and AssemblyAI have free plans?
Whisper: Yes, fully free. AssemblyAI: Yes.
Who makes Whisper?
Whisper is made by OpenAI, based in United States.
Who makes AssemblyAI?
AssemblyAI is made by AssemblyAI, based in United States.
Which should I choose, Whisper or AssemblyAI?
Choose Whisper if you value free under the mit license and robust to accents and noise. Choose AssemblyAI if you value high accuracy on english and rich analysis features.