Line 21 vs StreamText
StreamText and Line 21 both give human captioners a way to deliver live text to an audience, and both now add AI captions. StreamText focuses on caption delivery with per-minute pricing; Line 21 adds a choice of AI engines, live proofreading, translation, dubbing and streaming in one platform.
At a glance
| Feature | Line 21 | StreamText |
|---|---|---|
| Live AI captions | Yes, in 100+ languages | Yes |
| Human (CART) captioners | Yes: accredited stenographers and respeakers, or your own captioners, free | Yes: a delivery platform for CART captioners |
| Speech recognition engines | Choose per language: Speechmatics, Deepgram, Gladia, AWS Transcribe, Microsoft | Not stated publicly |
| Correcting AI captions | AI Proofreader checks every line against your event's names and terms | Not stated publicly |
| Live translation | Yes, 90+ languages with DeepL, Google, Azure and OpenAI | Yes |
| Live AI dubbing | Yes (beta): 75 languages with Gemini Live Translate | Not stated publicly |
| Captions encoded into streams | Yes: CEA-608 into RTMP and SRT, in the cloud | Yes: 608/708 cloud encoding, priced separately |
| Multi-language HLS player | Yes: a caption and dubbed audio track per language | Not stated publicly |
| Zoom and Teams | Yes: caption token for Zoom and Teams, plus a Zoom app | Yes: Zoom, Webex and Adobe Connect |
| Pricing | Free pay as you go; plans from $199 a month | Per minute, no subscription |
Key differences
Free for captioners
Line 21 is free for individual captioners and the agencies that book them; StreamText charges per minute of use.
AI that knows your event
Line 21 chooses from several speech engines and checks every line with the AI Proofreader against your event's names and terms.
Translation and dubbing
Line 21 translates captions live into 90+ languages and can dub speech into 75 languages.
Streams and players
Line 21 includes CEA-608 encoding and a multi-language HLS player, alongside the captions page and overlay.
Choose Line 21 if
- You are a captioner looking for a free platform
- You want AI captions that know your event's vocabulary
- You need translation, dubbing or video streaming in the same place
Choose StreamText if
- Your clients already expect StreamText links
- You need Webex or Adobe Connect integrations
About StreamText
StreamText has been used by CART captioners and court reporting firms since 2003 to deliver human-written captions. It offers an embeddable caption player, integrations with Zoom, Webex and Adobe Connect, translation, AI captioning, and a separately priced 608/708 cloud encoding service, all paid per minute.
Sources
Based on StreamText's public information, reviewed October 2026. Spotted something out of date? Tell us.
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