What is Lingo.dev used for?

Lingo.dev is an open-source localization tools and a platform for translating apps with LLMs, tuned with glossaries and brand voice, for teams shipping multilingual products. It is a good fit for localizing SaaS products into many languages, adding translation checks to CI/CD and keeping brand voice consistent across locales.

Is Lingo.dev open source?

Yes. Lingo.dev is open source under the Apache-2.0 licence. Its source code is on GitHub at lingodotdev/lingo.dev and is written mainly in TypeScript.

Yes. Lingo.dev is open source, so the software itself is free to use. A managed cloud version is also available, with paid plans from $99 per month.

What is Lingo.dev an alternative to?

Lingo.dev is an open-source alternative to Lokalise, Crowdin, Phrase and Smartling. Other open-source alternatives to Lokalise include Tolgee, Weblate and Pontoon.

Is Lingo.dev actively maintained?

Yes. The most recent commit to Lingo.dev was on 2 October 2026. The project has 5.4k stars on GitHub.

Lingo.dev: open-source alternative to Lokalise, Crowdin

About Lingo.dev

Lingo.dev is a set of open-source localization engineering tools that connect to the Lingo.dev platform. It is aimed at product teams that translate their software into multiple languages and want that work to be consistent, measurable and automated, instead of passing strings around by hand.

On the platform, teams configure localization engines with glossaries, brand voice and per-locale chains of language models, and call them from code, the command line, CI/CD pipelines or MCP. Quality criteria that teams define in plain words are used to score translations from LLMs and from native speakers, so low-scoring languages can be found and traced back to a model, a rule or a missing glossary term.

The open-source repository, written in TypeScript and licensed under Apache-2.0, includes a command-line tool and a compiler package, and its topics point to React and React Native projects. A hosted platform with sign-in, pricing and enterprise options sits alongside it.

Key features

LLM-based translation with glossaries
Configurable brand voice per locale
Per-language model selection with fallbacks
Quality scoring with custom criteria
Proofreading by native speakers
CLI, CI/CD and MCP access

Good fit for

→Localizing SaaS products into many languages
→Adding translation checks to CI/CD
→Keeping brand voice consistent across locales

Built with: TypeScript; JavaScript; React; React Native
Tags: localization; i18n; translation; llm; react; cli; typescript; ai

Lingo.dev: questions and answers

What is Lingo.dev used for?: Lingo.dev is an open-source localization tools and a platform for translating apps with LLMs, tuned with glossaries and brand voice, for teams shipping multilingual products. It is a good fit for localizing SaaS products into many languages, adding translation checks to CI/CD and keeping brand voice consistent across locales.
Is Lingo.dev open source?: Yes. Lingo.dev is open source under the Apache-2.0 licence. Its source code is on GitHub at lingodotdev/lingo.dev and is written mainly in TypeScript.
Is Lingo.dev free?: Yes. Lingo.dev is open source, so the software itself is free to use. A managed cloud version is also available, with paid plans from $99 per month.
What is Lingo.dev an alternative to?: Lingo.dev is an open-source alternative to Lokalise, Crowdin, Phrase and Smartling. Other open-source alternatives to Lokalise include Tolgee, Weblate and Pontoon.
Is Lingo.dev actively maintained?: Yes. The most recent commit to Lingo.dev was on 2 October 2026. The project has 5.4k stars on GitHub.