Line 21 Pricing 2026
Complete pricing guide for Line 21 — plans, costs, and free options.
💰 Line 21 Pricing Overview
Line 21 uses a paid pricing model. Requires a paid subscription or one-time purchase. Current pricing: No plans and no subscription — everything is pay-as-you-go, priced per minute or per hour and quoted in USD, GBP or EUR. Caption Minutes are $3/hour, and the vendor states you only pay for minutes when you supply your own human captioners, otherwise the caption minutes themselves are free; this covers the caption view page, overlay app and downloads as transcripts or subtitles. Human Captioners are from $120/hour through the vendor's network of professional captioners and captioning agencies, available on-site or remote across a wide range of languages and timezones. AI Proofreader is $21/hour and uses a context-aware LLM with custom event context that can be tweaked in real time. AI Translations are $9/hour across 120+ languages with custom dictionaries. ASR is $15/hour with a stated accuracy of up to 97% and custom dictionary support, ingesting direct audio or an RTMP stream. RTMP Video Encoding is $24/hour and covers CEA 608/708 encoding, SRT and RTMP ingest and simulcast to YouTube Live, Facebook Live, Twitch, Vimeo and custom RTMP destinations. HLS Video Streaming is $0.12/hour for 1080p with an embeddable multi-language player.. Line 21 is a popular audio & music tool known for live captioning combining human captioners, asr and an ai proofreader, with 120+ language translation. You can get started with Line 21 for free and upgrade to a paid plan as your needs grow.
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🔍 Compare Before You Buy
See all 5 alternatives →Comparing Line 21 to similar tools helps you make the best choice for your budget and needs:
Speechify
FreemiumTurn any text into audio — the leading text-to-speech reading app
Free plan + paid from $139/year
Compare with Line 21 →Descript
FreemiumEdit audio and video like a document — AI-powered podcast and video editor
Free plan + paid from $24/month
Compare with Line 21 →AssemblyAI
FreemiumSpeech AI API — transcription, diarization, and audio intelligence for developers
Free plan + paid from $0.37
Compare with Line 21 →Complete Your Audio Production Stack
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Try FreeStudio-quality AI voices
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Line 21 Plans & Pricing
Pay-as-you-go
Caption Minutes are
Hour, and the vendor states you only pay for minutes when you supply your own human captioners, otherwise the caption minutes themselves are free
Human Captioners are from
Hour through the vendor's network of professional captioners and captioning agencies, available on-site or remote across a wide range of languages and timezones
AI Proofreader is
Hour and uses a context-aware LLM with custom event context that can be tweaked in real time
AI Translations are
Hour across 120+ languages with custom dictionaries
ASR is
Hour with a stated accuracy of up to 97% and custom dictionary support, ingesting direct audio or an RTMP stream
RTMP Video Encoding is
Hour and covers CEA 608/708 encoding
HLS Video Streaming is
Hour for 1080p with an embeddable multi-language player
* Pricing information is based on publicly available data and may not reflect current promotions, annual discounts, or regional pricing. Visit the official Line 21 website for the latest pricing.
Is Line 21 your tool?
Claim it to take a capped slot in Audio & Music — each category sells a fixed number — so your row ranks above every free tool in it, and above the 5 alternatives we list for Line 21, with a Featured badge.
Claim Now →Is Line 21 Free?
Line 21 offers a free tier that lets you try the platform without any payment. The free plan typically includes core features with usage limits. For power users, paid plans unlock additional features and higher usage limits.
Before you pay for Line 21
We wrote up the free routes to this job
We have not written a free-Line 21-alternatives guide yet. The closest one we have is built around Speechify — the same Audio & Music job, and every free tier in it was read off the vendor's own pricing page on a stated date: the allowance, what the free plan withholds, and the price the paid tier actually starts at. Several of the tools in it are alternatives to Line 21 too.
Free Speechify alternatives, compared →Check Line 21 pricing at the source
The breakdown above is our summary of Line 21's published pricing, not a quote. Plans, limits and what each tier includes change without notice — confirm on Line 21's own pages before you buy.
Official Line 21 site ↗We do not represent Line 21 and these links are not paid placements.
Is Line 21 Worth It?
Line 21 is a premium audio & music tool that offers 5 key features including Human captioners, ASR and AI proofreading in one pipeline, Context builder and custom dictionaries for names and jargon, AI translation into 120+ languages. Line 21 provides live captioning for events and broadcasts, and its distinguishing position is that it treats human captioners and AI as complementary rather than as alternatives. The service can be run fully automated on ASR, fully human with professional captioners, or as a hybrid where speech recognition produces the base track and an AI proofreader corrects typos and name errors in real time against a context built for that specific event. That context builder is the part that matters for conferences and corporate events, where the words that break automatic captioning are almost always proper nouns — speaker names, product names, internal jargon — and can be loaded in advance as a custom dictionary. AI translation extends captions into 120+ languages using the same pipeline. Delivery is flexible: RTMP and HLS streaming, CEA 608/708 caption encoding for broadcast, an embeddable player that lets viewers pick their caption language, a standalone caption view page, on-screen overlays, playlists and an API. Platform integrations cover YouTube, Twitch, Facebook, Vimeo, custom RTMP destinations, Microsoft Teams, Skype, Zoom and AWS, and a meeting bot joins calls directly. The customer base is described as both organisations captioning their own next event and agencies white-labelling the technology for their own clients. Documentation and a blog accompany the product.
✅ Line 21 is a good choice if you need:
- •Human captioners, ASR and AI proofreading in one pipeline
- •Context builder and custom dictionaries for names and jargon
- •AI translation into 120+ languages
- •CEA 608/708 encoding, RTMP and HLS delivery with an embeddable player
- •Meeting bot for Teams, Zoom and Skype plus a full API
💡 Value Assessment
With a free tier available, Line 21 is an easy recommendation for anyone looking to try audio & music tools without financial commitment. The paid plans offer good value for power users who need the additional features and higher usage limits.
Line 21 Key Features
Line 21 comes packed with features that make it a strong contender in the audio & music space. Here's what you get:
Human captioners, ASR and AI proofreading in one pipeline helps you work more efficiently with Line 21.
Customize Line 21 to match your specific needs and preferences.
AI translation into 120+ languages helps you work more efficiently with Line 21.
CEA 608/708 encoding, RTMP and HLS delivery with an embeddable player helps you work more efficiently with Line 21.
Integrate Line 21 into your own applications and workflows via the API.
Line 21 Alternatives & Their Pricing
Considering alternatives to Line 21? Here's how competing tools compare on pricing:
Speechify
FreemiumTurn any text into audio — the leading text-to-speech reading app
Pricing: Free (10 voices, 1x-1.5x speed). Premium $139/yr or $29/mo for all 200+ voices and 4.5x speed
Descript
FreemiumEdit audio and video like a document — AI-powered podcast and video editor
Pricing: Free (1 hr transcription/mo). Creator $24/mo, Pro $40/mo. Business custom.
AssemblyAI
FreemiumSpeech AI API — transcription, diarization, and audio intelligence for developers
Pricing: Free tier ($50 credit). Pay-as-you-go from $0.37/hr. Enterprise custom pricing
NaturalReader
FreemiumText-to-speech app for reading PDFs and documents aloud — 200+ AI voices
Pricing: Free tier (20 min/day). Plus $9.99/mo, Premium $19.99/mo. One-time personal license $149.50
Voicemod
FreemiumReal-time AI voice changer and soundboard for gaming and streaming
Pricing: Free with limited voices. Paid tiers exist but Voicemod publishes NO price anywhere on the web — voicemod.net/pricing/ 301s to the homepage, /en/pricing/ 404s, and its own page-sitemap.xml (lastmod 2026-09-28) lists no pricing or plans URL. Prices are shown in-app only (checked 2026-09-28)
Ready to try Line 21?
Visit the official website for the latest pricing and to get started.
Frequently Asked Questions
Is Line 21 free to use?
Yes, Line 21 offers a free tier that you can use without paying. Paid plans starting at Variable unlock additional features and higher usage limits.
How much does Line 21 cost in 2026?
As of 2026, Line 21 pricing is: No plans and no subscription — everything is pay-as-you-go, priced per minute or per hour and quoted in USD, GBP or EUR. Caption Minutes are $3/hour, and the vendor states you only pay for minutes when you supply your own human captioners, otherwise the caption minutes themselves are free; this covers the caption view page, overlay app and downloads as transcripts or subtitles. Human Captioners are from $120/hour through the vendor's network of professional captioners and captioning agencies, available on-site or remote across a wide range of languages and timezones. AI Proofreader is $21/hour and uses a context-aware LLM with custom event context that can be tweaked in real time. AI Translations are $9/hour across 120+ languages with custom dictionaries. ASR is $15/hour with a stated accuracy of up to 97% and custom dictionary support, ingesting direct audio or an RTMP stream. RTMP Video Encoding is $24/hour and covers CEA 608/708 encoding, SRT and RTMP ingest and simulcast to YouTube Live, Facebook Live, Twitch, Vimeo and custom RTMP destinations. HLS Video Streaming is $0.12/hour for 1080p with an embeddable multi-language player.. Visit the official Line 21 website for the most current pricing.
What is the cheapest Line 21 plan?
The cheapest option is the free tier. If you need premium features, the most affordable paid plan is Pay-as-you-go at Variable.
What are the best alternatives to Line 21?
Popular alternatives to Line 21 include Speechify, Descript, AssemblyAI. Each offers different features and pricing structures. Compare them on AISO Tools to find the best fit for your needs and budget.
Is Line 21 worth the price?
Line 21 is well-regarded in the audio space, offering features like Human captioners, ASR and AI proofreading in one pipeline, Context builder and custom dictionaries for names and jargon, AI translation into 120+ languages. Whether it's worth the investment depends on your specific needs, usage volume, and budget. The free tier lets you try it before committing to a paid plan.
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