kitio.aiWhisper vs Line 21
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Whisper is completely free, while Line 21 is paid.
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
- Human and ASR live captioning
- AI translation
- AI proofreader
- RTMP and HLS streaming
- Meeting bot
- API
| Feature | Whisper | Line 21 |
|---|---|---|
| Best for | OpenAI's open-source speech recognition and translation model | Live captions that mix human captioners with AI tools |
| Category | Audio & voice | Audio & voice |
| Pricing model | Free | Paid |
| Starting price | Free | $3 / hour |
| Free plan | Yes, fully free | No |
| Made by | OpenAI | Line 21 |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Whisper is completely free, while Line 21 is paid.
Free plan
Cheapest paid plan
Top plan
Free trial
6 plans
Caption minutes
$3 / hour
- Only when you bring your own captioners
- Caption view page
Meetings
$6 / hour
- Speech-to-text and translation
- Diarization
- Dedicated meeting page
AI translations
$9 / hour
- 120+ languages
- Custom dictionaries
ASR
$15 / hour
- Speech-to-text models
- Custom dictionaries
- Audio or RTMP ingest
AI proofreader
$21 / hour
- Context-aware LLM checks
- Custom event context
Human captioners
From $120 / hour
- Certified professional writers
- On-site or remote
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
Line 21
- Combines human and AI captioning
- Works with Zoom, Teams and streaming platforms
- Pay-as-you-go billing
- Human captioning starts at $120 an hour
- Prices are per service per hour
- Built mainly for events and broadcasts
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 Line 21 if you want:
- Combines human and AI captioning
- Works with Zoom, Teams and streaming platforms
- Pay-as-you-go billing
Watch out: human captioning starts at $120 an hour.
Whisper vs Line 21 FAQ
What is the difference between Whisper and Line 21?
Whisper: OpenAI's open-source speech recognition and translation model. Line 21: Live captions that mix human captioners with AI tools. Both are audio & voice tools.
Is Whisper or Line 21 cheaper?
Whisper is completely free, while Line 21 is paid.
Do Whisper and Line 21 have free plans?
Whisper: Yes, fully free. Line 21: No.
Who makes Whisper?
Whisper is made by OpenAI, based in United States.
Who makes Line 21?
Line 21 is made by Line 21.
Which should I choose, Whisper or Line 21?
Choose Whisper if you value free under the mit license and robust to accents and noise. Choose Line 21 if you value combines human and ai captioning and works with zoom, teams and streaming platforms.