Supertext API review
A developer-focused API combining AI translation with optional human verification.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Supertext API is a RESTful translation service for developers, growth teams, and localization specialists. It handles plain text and uploaded files with AI, supports automatic language detection, and offers optional human-verified fused translation. The API can connect translation workflows across websites, applications, CMS, PIM, and TMS environments. Supported file types include HTML, XML, Office documents, PDFs, subtitles, and plain text, giving teams a focused option for programmatic content localization rather than a standalone desktop translation tool.
Its strongest fit is workflow integration. API-key authentication supports controlled access, while quote endpoints allow advance cost checks before translation requests. Asynchronous file translation and download suit processes that do not need an immediate response, and usage and cost monitoring helps teams track API activity. Glossary parameters add terminology control for repeated or specialized language. The integration list includes Across, Drupal, memoQ, Microsoft Outlook, Microsoft PowerPoint, Microsoft Word, STAR Transit, Trados Studio, Wordbee, and XTM, alongside CMS, PIM, and TMS connections.
The pricing structure is built around a separate monthly API subscription and usage-based translation charges, so it is better suited to organizations planning recurring API workflows than to occasional users seeking a free starting point. There is no free plan, and the supported language set is limited to 28 verified languages. Choose Supertext API when file handling, human verification, terminology controls, and localization-system integration matter. Teams needing broader language coverage, a free tier, or a simpler point-and-click translation experience should consider an alternative.
Supertext API pros and cons
- Where it wins
- Translates plain text and uploaded files with AI
- Adds optional human verification and glossary controls
- Supports quotes, asynchronous downloads, and cost monitoring
- Where it doesn't
- No free plan is available
- Requires separate monthly and usage-based API charges
- Supports 28 verified languages
Supertext API fact sheet, pricing and score →
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