Choose the caption output before choosing a translator. A Browser Source puts subtitles into the broadcast video; a Twitch channel extension gives each viewer separate controls; native player CC requires a compatible caption-data track. A tool that translates written chat solves a different task.
StreamTranslate publishes this comparison. It is based on the linked product documentation, not a controlled head-to-head accuracy or latency test. The options below are grouped by workflow, not ranked by measured performance.
Compare the requirements that matter
- Input: your own microphone or OBS audio, another browser tab, written chat, or a recorded file.
- Output: captions in the video, a viewer-selected Twitch extension, native player CC, or private subtitles for a viewer.
- Processing: cloud services need a connection; local models need installation and suitable local resources.
- Evidence: test the same language pair, audio and streaming workload. A provider model benchmark does not establish caption timing on your channel.
StreamTranslate: cloud captions for your broadcast
StreamTranslate supports 65 live-caption target languages. Supply audio through a supported browser microphone, OBS audio plugin or RTMP route, then display captions through an OBS or Streamlabs Browser Source. The Browser Source workflow needs no OBS caption plugin; the optional audio plugin is a separate OBS Studio integration. Cloud speech processing still requires local audio capture and browser rendering.
For per-viewer language choice on Twitch, the broadcaster installs, activates and links the official channel extension and starts an audio caption session. Viewers then choose their caption language on the enabled channel. That extension does not automatically translate every Twitch channel for a viewer.
Caption timing varies with speech, connection and caption settings. Test the full speech-to-visible-caption path with your own audio and selected languages.
Streamlabs Browser Source steps · Official Twitch extension setup · What Twitch viewers control
Local OBS processing: LocalVocal
LocalVocal’s official repository documents local speech recognition and translation, CPU processing with no required GPU, and optional cloud translation providers. Check the release, operating system, model and provider settings you intend to use. A cloud provider selected inside a local plugin can still send text or audio off the computer and incur service costs.
A local workflow may suit a streamer who wants offline processing and is willing to install and configure models. We have not measured its caption latency, accuracy, frame rate or setup time against StreamTranslate. Compare the workflow and privacy choices.
Twitch caption services: Stream Closed Captioner
Stream Closed Captioner offers a Twitch caption workflow with basic captions and Bits-based translation features. Check its current language choices, viewer controls and translation terms. Do not treat basic same-language captions, translated captions and native player CC as interchangeable.
Choose by the output your audience needs and verify the result in an actual viewer window. The number of languages or a “real-time” label alone does not establish comprehension or timing for your audio.
Watching a stream, reading chat or translating a recording
- Watch Party translates selected browser-tab audio into private live subtitles in Control. It is included with Elite; browser audio-sharing support and protected content can limit capture.
- Chat Translator is a separate free browser extension for written incoming chat and reply drafts on supported Twitch, YouTube, Kick, X and TikTok LIVE pages. It does not caption spoken audio.
- Video and VOD Translator processes uploaded recordings into subtitles in 60 languages, with up to three tracks. It is billed separately from live-caption plans.
Compare monthly hours and one-time use
Free Plan: 3 active streaming hours every month, card required; no payment unless you upgrade. Stream Pass is $12 one-time for 12 active hours across sessions, without a wall-clock expiry. Starter is $14.99/mo for 25 hours per month; Pro is $34.99/mo for 50 hours per month; Elite is $149/mo with unlimited streaming hours. Starter overage is $1/hour and Pro overage is $0.50/hour. The $1 first-month Starter offer is for first-time customers.
The 25-hour Starter and 50-hour Pro allowances are monthly, not weekly. A Stream Pass supplies active caption hours that can be used across sessions; it is not limited to one stream. Choose using your expected active caption hours and review overages before starting. Current plan and billing details.
Rehearse before you commit
- Use representative speech, accents, names and game or technical vocabulary.
- Record the original audio and the caption output together; review timing, translation and readability separately.
- For an extension, test two viewer windows with different language choices. For an overlay, inspect the outgoing recording.
- Stop the caption session before private speech; hiding an overlay or muting only an OBS mixer does not necessarily stop browser microphone capture.
Reviewed October 20, 2026. Official sources: LocalVocal, Stream Closed Captioner, Twitch caption guide and the linked StreamTranslate setup and pricing pages. Product availability can change; no universal speed or growth result is claimed.
Frequently Asked Questions
Which live stream translator should I choose for Twitch?
Choose by input, caption output, language pair, privacy needs and budget. StreamTranslate provides cloud caption overlays and a broadcaster-enabled Twitch extension; LocalVocal documents local OBS processing. Rehearse the workflow you intend to use rather than relying on an unmeasured ranking.
What does StreamTranslate cost?
Free Plan: 3 active streaming hours every month, card required; no payment unless you upgrade. Stream Pass is $12 one-time for 12 active hours across sessions, without a wall-clock expiry. Starter is $14.99/mo for 25 hours per month; Pro is $34.99/mo for 50 hours per month; Elite is $149/mo with unlimited streaming hours. Starter overage is $1/hour and Pro overage is $0.50/hour. The $1 first-month Starter offer is for first-time customers.
Does StreamTranslate create native Twitch CC?
A StreamTranslate Browser Source puts captions into the video, and its official Twitch extension provides separate viewer controls. Neither alone creates the native Twitch player caption-data track.
Can viewers translate a stream without the broadcaster enabling the extension?
The official Twitch caption extension requires broadcaster setup and an active audio session. The separate Elite Watch Party workflow can capture supported browser-tab audio for a viewer, subject to browser and content restrictions.
How fast is StreamTranslate?
Caption timing varies with speech, connection and caption settings. Test the full speech-to-visible-caption path with your own audio and selected languages.
How many languages are supported?
Live captions support 65 target languages. Uploaded-video subtitles support 60 languages and up to three subtitle tracks. Source-language recognition and audio capture depend on the selected setup.