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Open TLC

Free#27 of 29 in Computer-Assisted Translation Software

Open TLC: A format-focused, open-source CAT tool for translators handling diverse file workflows. Ranked #27 of 29 in Computer-Assisted Translation Software by our editors (6.4/10); pricing: Free plan; best for open-source browser CAT with format-focused workflows.

6.4/10Editor score

Visit Open TLC

Open TLC6.4 Visit Open TLC

At a glance

Editor score
6.4 / 10
Pricing
Free plan
Best for
Open-source browser CAT with format-focused workflows
Free plan
Yes
Paid from
Free
Facts checked
21 Sep 2026

Where it wins
- Supports 44 office, web, localization, publishing, subtitle, and media workflows
- Handles TMX, TBX, XLIFF, protected codes, and structural metadata
- Includes local OCR, transcription, QA checks, and CAT package returns
Where it doesn't
- Projects are stored locally in the browser using IndexedDB
- The application is available as a web platform
- No verified integrations are presented beyond exchange workflows

Our verdict on Open TLC

Open TLC is a browser-based, open-source computer-assisted translation tool for professional translators, learners, and teams. Its focus is structured work across office documents, web and localization resources, publishing files, subtitles, media, and CAT exchange formats. The application supports translation memory, terminology management, protected inline content, validation, and export, making it suited to translators who need format-aware processing rather than a general text editor.

Its strongest area is format coverage. Open TLC supports 44 registered workflows and includes format-aware import, translation, validation, and export. Translation teams can exchange TMX memories, use TBX terminology resources, and work with XLIFF 1.2, 2.0, and 2.1 projects. Protected inline codes, placeholders, and structural metadata help preserve content that should not be translated. Format-specific checks run before translated output is generated, while CAT package return workflows cover Trados, WorldServer, memoQ, Transit, TIPP, and COTI. Local OCR and audio/video transcription extend the workflow beyond manually prepared text.

Open TLC’s open-source model and free plan make it suitable for users who want a browser CAT tool without a hosted Open TLC storage server. Projects are stored locally in the browser with IndexedDB, and the published platform is web-based. That local approach fits individual work and controlled file handling, but teams seeking centrally managed projects or verified third-party integrations should evaluate alternatives. Open TLC is a strong fit for format-heavy translation, exchange-package work, and users comfortable with local browser storage; it is less suitable for organizations that require a broader connected platform around the CAT workspace.

Your product? Our editors can test Open TLC in depth and publish a review, labelled as paid · from $149/mo →

Open TLC pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on opentlc.org

Open TLC fact sheet

Free plan	Yes
Paid from	Free
Translation memory	Yes
Terminology management	Yes
QA checks	Yes
Alignment tool	Not verified
Deployment model	Web
Offline desktop use	Not verified
Deployment	Cloud
Platforms	Web
Support	Community
Built for	Solo, Small business (editorial estimate)
Pricing	Free plan
Website	opentlc.org
Facts checked	21 Sep 2026

Alternatives to Open TLC

See all Open TLC alternatives →

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Featured on iTechGuides

Open TLC is listed in our Computer-Assisted Translation Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update