Supertext API
What Supertext API is
Supertext API is a RESTful translation service for integrating AI translation into websites, programs, and business systems. It translates text and files across 28 languages, with additional language variants, automatic language detection, glossary support, and a preferred formality setting. Supported formats include HTML, XML, DOCX, XLSX, PPTX, PDF, SRT, and TXT. Workflows can run as instant AI translation or asynchronously with human assistance; professional linguists can verify important translations from CHF/EUR 5.70. The HTTP API is designed for CMS, PIM, and TMS connections. API-key authentication, usage monitoring, and cost overviews are available in its cockpit. Supertext says hosting is on Swiss servers or on-premises, with encrypted transmission, instant text deletion, GDPR and Swiss FADP compliance, and ISO 27001, ISO 9001, ISO 17100, and ISO 18587 certification. Pricing is paid, with no free plan, a separate monthly base fee, and usage-based charges.
Who it suits
Supertext API suits developers, growth teams, and localisation specialists integrating translation into software or content systems. It is intended for document and website translation workflows requiring glossaries or optional human verification.
What it does well
- Supports translation in 28 languages
- Handles text and multiple file formats
- Glossaries help maintain terminology
- Offers API usage monitoring and cost overviews
- Human verification is available
What to know first
- No free plan
- Monthly base fee is separate
- Translation charges are usage-based
- Verification starts from CHF/EUR 5.70
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| API monthly base fee | Separate monthly API subscription | On request |
| API monthly base fee | Separate monthly API subscription | On request |
| API usage | Usage-based translation charges | On request |
| API usage | Usage-based translation charges | On request |
| API subscription | Monthly base fee; usage-based charges are billed monthly. · CHF/EUR 20 per million characters · verification billed separately | 4.90 CHF/EUR a month |
As supertext.com lists them, read 22 Sept 2026. The maker's own page has the final word.
Verdict
Supertext API provides programmable translation with file support, terminology controls, and optional linguistic verification. Buyers need to account for both the recurring API subscription and usage-based translation charges.
Facts from Supertext API's own pages
- Access and monitoring
- The API uses API-key authentication and offers usage monitoring and cost overviews in the cockpit. · supertext.com, 12 Oct 2026
- API access
- Yes · supertext.com, 22 Sept 2026
- Certifications
- Supertext states it is certified to ISO 27001, ISO 9001, ISO 17100, and ISO 18587. · supertext.com, 12 Oct 2026
- Document translation
- Yes · supertext.com, 22 Sept 2026
- File formats
- Supported formats include HTML, XML, DOCX, XLSX, PPTX, PDF, SRT, and TXT. · supertext.com, 12 Oct 2026
- File limits
- File translation supports up to 1,000,000 characters and 30 MiB per file, at up to 1 request per second. · supertext.com, 12 Oct 2026
- Free plan
- No · supertext.com, 22 Sept 2026
- Glossaries
- Requests can include glossaries and a preferred formality level to keep translations aligned with terminology and tone. · supertext.com, 12 Oct 2026
- Glossary tools
- Yes · supertext.com, 22 Sept 2026
- Headquarters
- Zurich, Switzerland · supertext.com, 4 Oct 2026
- Human verification
- Professional linguists can verify important translations through the API, with verification available from CHF/EUR 5.70. · supertext.com, 12 Oct 2026
- Integration
- The HTTP API is designed to connect with core systems such as CMS, PIM, and TMS. · supertext.com, 12 Oct 2026
- Intended users
- Supertext describes the API as built for developers, growth teams, and localisation specialists. · supertext.com, 12 Oct 2026
- Language detection
- The API can automatically detect the language of text or files. · supertext.com, 12 Oct 2026
- Languages
- The API offers automatic translation in 28 languages, with additional language variants. · supertext.com, 12 Oct 2026
- Purpose
- The RESTful API translates text and files with AI and can be integrated into websites, programs, and other systems. · supertext.com, 12 Oct 2026
- Request limits
- AI text requests allow up to 10,000 characters at 5 requests per second; fused text requests allow 3,000 characters at 1 request per second. · supertext.com, 12 Oct 2026
- Security
- Supertext says the API is hosted on Swiss servers or on-premises, uses encrypted transmission and instant text deletion, and complies with GDPR and Swiss FADP. · supertext.com, 12 Oct 2026
- Supported languages
- 28 · supertext.com, 22 Sept 2026
- Website translation
- Yes · supertext.com, 22 Sept 2026
- Workflow
- The API supports instant AI translation and asynchronous human-assisted translation workflows. · supertext.com, 12 Oct 2026
Where Supertext API stands on Freedom251
- Translation apps#150 of 158
- Translation Software#149 of 156