Tolgee

Tolgee is an open-source, developer-focused platform for translation management and application localization without modifying code. Its in-context editor lets translators work within an application, while its AI Translator uses context from native JavaScript SDKs, including in-context dialogs. It is designed for web applications and can also serve mobile and desktop apps.

Listed integrations include React, Angular, Vue, Svelte, Next.js, i18next, Flutter, Slack, Figma, Unreal Engine and a REST API. Supported formats include JSON, XLIFF, gettext PO, Apple strings, Android XML, Flutter ARB, CSV and XLSX. Tolgee also lists translation memory, glossary management, context screenshots, role permissions and a plugin for in-game delivery. The free plan includes 30,000 words and three seats. Paid plans list unlimited seats and 400,000 MT credits; Optimise costs €133.00 per month billed annually. Tolgee says it is ISO 27001 certified, complies with the EU GDPR, and encrypts SaaS data at rest and in transit. It says customer data is not used to train AI models.

Tolgee combines in-context localization with integrations, translation memory and AI-assisted translation. Teams should compare the free plan's word and seat limits with the paid plan allowances.

Tolgee suits development and localization teams translating web, mobile or desktop applications. Its in-context editor and integrations are relevant for teams working within application frameworks and design tools.

Tolgee is an open-source localization system built around software projects, especially web applications. It suits developer–translator teams that need to edit strings in application context, while mobile, desktop and self-hosted deployments broaden its reach. The main trade-off is capacity: the free tier is useful for small projects, but growing teams must account for its word and seat ceiling.

Overview

Tolgee brings translation work into the application workflow, so teams can localize without repeatedly changing source code for each string. Its in-context editor lets translators work while viewing the application, and developers can connect projects through SDKs, framework integrations or the REST API. Translation memory, glossary management, context screenshots and role permissions provide the controls needed for consistency and collaboration.

The platform is open source and can be used as SaaS or self-hosted. Self-hosted customers retain control of their infrastructure; Tolgee says it cannot access their projects, accounts or logs. That is a strong fit for organizations with deployment and compliance requirements, while SaaS is simpler for teams that do not want to operate the service themselves.

Key features

In-context editing is Tolgee's clearest advantage. Translators can see where text appears instead of relying only on a key or a detached translation screen, and screenshots provide an additional visual cue. The AI Translator uses context from Tolgee's native JavaScript SDKs, including in-context dialogs, to inform its translations. This makes the feature more relevant to application strings than a context-free machine-translation workflow.

Translation memory and glossaries help preserve terminology across releases. Role permissions support division of responsibility, while the plugin for in-game delivery extends the workflow to game projects. Integrations cover React, Angular, Vue, Svelte, Next.js, i18next, Flutter, Slack, Figma and Unreal Engine, with a REST API for other connections. Supported formats include JSON, XLIFF, gettext PO, Apple strings, Android XML, Flutter ARB, CSV and XLSX, giving teams practical import and export options across common stacks.

Tolgee states that it is ISO 27001 certified and complies with the EU General Data Protection Regulation. Its SaaS encrypts databases, file storage and backups with AES-256, and network traffic with HTTPS/TLS. Customer data is not used to train AI models, and selected LLM providers state that API-submitted data is not used for model training.

Pricing

Tolgee uses a freemium model. The Free plan costs nothing and includes 30,000 words, three seats, standard localization features, automation and machine translation. That combination suits a small product or an evaluation project, but the word and seat limits can become restrictive as soon as several contributors or a larger language set are involved.

The Translate plan is €58 a year, billed annually, with unlimited seats, 400,000 MT credits and standard localization features. Manage costs €373 a year, also billed annually, and includes the same stated seat and MT-credit allowances plus standard localization features. Optimise is €133 a month, billed annually, with unlimited seats and 400,000 MT credits. The paid plans remove the Free plan's seat restriction and provide substantially more translation capacity, so they fit active teams rather than occasional personal projects.

Enterprise has custom pricing and adds premium support, SSO, a dedicated Slack channel, an account manager, team training and prioritized feature requests. On-Premises also has custom pricing, with monthly or annual licensing tailored to the customer; self-hosting, advanced features and support are included. Those offerings are aimed at organizations that need procurement, assistance or infrastructure control beyond the standard SaaS tiers.

Platforms

Tolgee supports Android, iOS, web, API, browser extension and self-hosted deployments. It is designed for web applications but can also serve mobile and desktop applications, with integrations and file formats covering both developer-led and design-led workflows.

Who it's for

Tolgee is a good match for software companies whose translators need application context and whose developers want framework, SDK and API connectivity. It is particularly suitable when open-source availability, self-hosting or stated data controls matter. Small teams can start on Free; larger engineering organizations should compare paid allowances with their word volume and machine-translation needs. Teams looking primarily for general-purpose document translation, rather than product localization, should consider a broader service.

Pros and cons

Pros

• In-context workflow: Translators can edit within the application, with screenshots supplying visual context.
• Developer coverage: Framework integrations, native JavaScript context, Flutter and a REST API fit varied application stacks.
• Deployment control: Open-source and On-Premises options let customers retain infrastructure control.
• Operational safeguards: ISO 27001 certification, GDPR compliance and stated encryption practices support security-conscious teams.

Cons

• Free-tier ceilings: 30,000 words and three seats limit the no-cost plan for expanding teams.
• Paid-plan complexity: Translate, Manage and Optimise present different annual or annual-billed price terms, so buyers must match the allowance to their workflow.
• Enterprise and On-Premises cost visibility: Both require custom pricing, making budgeting less direct.

Alternatives

Crowdin is worth choosing when a team wants a freemium service with a free trial and support across Android, iOS, web, desktop and Linux platforms.

OneSky suits buyers looking for freemium localization with AI-driven quality estimation or multi-agent translation offerings.

locize is a better fit when a small project prioritizes a clearly defined free allowance of 2,000 words, two languages, five namespaces and one user.

LingoHub offers a paid Starter plan at €45 a month with unlimited seats and roughly 15,000 words of monthly capacity.

Transifex is an option for teams prepared for paid plans starting at $160 a month and collaborator-based limits.

Applanga is for teams wanting a two-week free trial rather than a permanent free plan.

XTM Cloud targets organizations seeking a paid, enterprise-scale platform.

Localizely is an alternative with a free plan offering 250 hosted string keys, one project and unlimited users and languages.

For broader comparisons, see Translation Management Software, Game Localization Software and Translation Software.

Verdict

Tolgee is a strong choice for software teams that want context-rich translation, developer integrations and the option to self-host. Its main reason to look elsewhere is scale or budget: the Free plan's 30,000-word, three-seat cap is narrow for a growing product, while custom-priced enterprise options require a larger commitment.