Translation.io
Translation.io is a localization service for developers whose applications keep changing.
What Translation.io is
Translation.io is a localization service for developers whose applications keep changing. Teams can push new source keys and pull updated translations while development continues, using shared translation memory. Integrations are listed for Ruby on Rails, Laravel, React, Angular, and JavaScript; other stacks can use a custom library guide and documented REST API. Source keys can be pre-translated with Google Translate, DeepL, or Neurooo through OpenAI, Anthropic, and DeepSeek models, then reviewed by invited human translators. Teams assign roles and target languages, tag and filter segments, and use tags in statistics reporting. Projects, languages, teammates, machine translation, translation memory, and API calls are listed as unlimited. Active projects cost €0.01/mo with only translated keys billed; frozen projects cost half as much but cannot synchronize or translate. A seven-day trial requires no card.
Good
- Continuous source-key synchronization
- Shared translation memory for teams
- Human review of machine translations
- Integrations for major development stacks
- API access and workflow automation
Watch out
- Frozen projects cannot synchronize or translate
- Paid usage bills translated keys
- Absolute security cannot be guaranteed
Who it suits
It suits development teams localizing frequently changing applications. Open-source projects with a public repository and README mention can qualify for a free unlimited account.
Verdict
Translation.io brings continuous localization, machine translation, human review, and developer integrations together. Its per-translated-key billing and frozen-project restrictions should be checked against your workflow.
Plans and prices
From Translation.io's own pricing page, checked 21 Sep 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Active project | €0.01 a month | Unlimited projects, languages and teammates · Only translated keys are billed · Translation memory included · API calls included · billed monthly |
| Frozen project | €0.01 a month | Billed at half the active-project price · Synchronization and translation are unavailable while frozen · billed monthly |
| Open Source | — | Free unlimited account for qualifying open-source projects · Requires selecting Open Source and specifying a public repository · Requires mentioning Translation.io in the public README |
| Pay per translated target key | €0.01 a month | Only translated keys are billed · projects, languages, teammates, machine translation, translation memory, and API calls are unlimited · €0.01/month per translated target key; frozen projects are half price. |
The facts
Each one read from Translation.io's own pages, with the date it was checked.
What it does
- API
- The API uses REST principles, requires HTTPS and authentication, and accepts JSON parameters with JSON responses.checked 3 Oct 2026
- API access
- Yeschecked 21 Sep 2026
- Continuous localization
- Developers can push new source keys and pull updated translations while continuing to develop the application.checked 3 Oct 2026
- Custom stacks
- For other stacks, the site offers a guide to create a library and a documented API to customize translation workflows.checked 3 Oct 2026
- Frozen project limit
- A frozen project costs half as much, but cannot be synchronized or translated until unfrozen.checked 3 Oct 2026
- Human review
- Teams can invite human translators to review machine translations and continue translating.checked 3 Oct 2026
- Integrations
- The site lists integrations for Ruby on Rails, Laravel, React, Angular, and JavaScript.checked 3 Oct 2026
- Open-source offer
- The pricing page offers a free unlimited account for life when an open-source project has a public repository and mentions Translation.io in its public README.checked 3 Oct 2026
- Project limits
- Projects, languages, teammates, machine translation, translation memory, and API calls are listed as unlimited.checked 3 Oct 2026
- Purpose
- Translation.io helps developers localize and translate applications that are constantly evolving.checked 3 Oct 2026
- Security and privacy
- The privacy policy says it uses commercially acceptable means to protect personal data but cannot guarantee absolute security; it identifies the company as GDPR data controller.checked 3 Oct 2026
- Support
- The site provides documentation and lists [email protected] for questions and help getting localization started.checked 3 Oct 2026
- Translation memory
- Yeschecked 21 Sep 2026
- Workflow tools
- Users can tag segments, filter them, and use tags in the statistics screen for reporting.checked 3 Oct 2026
Money
- Free plan
- Yeschecked 21 Sep 2026
- Trial and refund
- The site advertises a 7-day trial with no credit card required and a 100% refund within 45 days of payment if the customer is dissatisfied.checked 3 Oct 2026
The company
- Headquarters
- Mons, Belgiumchecked 28 Sep 2026
- Team features
- Teams can assign roles and target languages, and teammates share project translation memory.checked 3 Oct 2026
Where it runs
- Machine translation
- The service can pre-translate source keys with Google Translate, DeepL, or Neurooo using OpenAI, Anthropic, and DeepSeek models.checked 3 Oct 2026
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