kitio.aiSonix vs Line 21
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Sonix starts at $25/mo and Line 21 starts at $3 / hour. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Multilingual transcription
- Transcript translation
- Speaker identification
- AI summaries and themes
- Subtitle and NLE exports
- Human and ASR live captioning
- AI translation
- AI proofreader
- RTMP and HLS streaming
- Meeting bot
- API
| Feature | Sonix | Line 21 |
|---|---|---|
| Best for | Automated transcription and translation in 50+ languages | Live captions that mix human captioners with AI tools |
| Category | Audio & voice | Audio & voice |
| Pricing model | Free trial | Paid |
| Starting price | $25/mo | $3 / hour |
| Free plan | No, trial available | No |
| Made by | Sonix | Line 21 |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Sonix starts at $25/mo and Line 21 starts at $3 / hour. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Pay As You Go
$10 / hour
- Transcription and translation
- 5 GB storage
- Single user
Core
$25/mo
- 5 hrs/month transcription
- 5 hrs/month AI workspace
- 25 GB storage
- 1 user, +$25 per seat
Advanced
$50/mo
- 20 hrs/month transcription
- 25 hrs/month AI workspace
- 50 GB storage
Pro
$80/mo
- 40 hrs/month transcription
- 100 hrs/month AI workspace
- 100 GB storage
- Priority support
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
Sonix
- Wide language support
- Pay per hour, no lock-in
- Strong export options
- Costs add up for heavy users
- Free trial is only 30 minutes
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 Sonix if you want:
- Wide language support
- Pay per hour, no lock-in
- Strong export options
Watch out: costs add up for heavy users.
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.
Sonix vs Line 21 FAQ
What is the difference between Sonix and Line 21?
Sonix: Automated transcription and translation in 50+ languages. Line 21: Live captions that mix human captioners with AI tools. Both are audio & voice tools.
Is Sonix or Line 21 cheaper?
Sonix starts at $25/mo and Line 21 starts at $3 / hour. Check both pricing pages for current plans.
Do Sonix and Line 21 have free plans?
Sonix: No, trial available. Line 21: No.
Who makes Sonix?
Sonix is made by Sonix, based in United States.
Who makes Line 21?
Line 21 is made by Line 21.
Which should I choose, Sonix or Line 21?
Choose Sonix if you value wide language support and pay per hour, no lock-in. Choose Line 21 if you value combines human and ai captioning and works with zoom, teams and streaming platforms.