No account · Free offline CI check · Repo-native MCP

A Lingo.dev alternative that needs no account to start

Both translate your app with AI, ship a CLI, a GitHub Action and an MCP server. The difference is shape: Lingo.dev pushes your content to a configured server-side engine; KAERIS translates the files already in your repo — free to start, with an offline CI check and a repo-native MCP.

Translate your files → $ pip install kaeris

✓ No account to start ✓ Free offline CI check ✓ 11 formats · 46 languages ✓ Repo-native MCP ✓ Flat pricing, BYOK option

Two different shapes

Engine you configure vs. files you translate

Lingo.dev

A configurable localization engine. Its CLI (lingo push / lingo pull) ships your source content to a server-side engine that holds glossary, brand voice and model configuration, then writes results back. Requires lingo login or an API key. Strong fit if your team wants persistent, configured localization infrastructure.

KAERIS

Translate-and-ship. The kaeris CLI, REST API, MCP server and GitHub Action translate the files in your repo directly — placeholder-safe, incremental via kaeris.lock. No account to start, and a free offline check that makes no API call. Strong fit if you just want your strings translated fast.

Honest comparison

KAERIS vs Lingo.dev

Both are developer-first and translate well. Here's where they genuinely differ.

Lingo.devKAERIS

AI translation, many languages✓✓ 46

CLI + GitHub Action✓✓

MCP server✓✓ repo-native

No account / API key to startlogin required✓

Free offline CI check (no API call)–✓

Reproducible lockfile✓ server✓ local

Translation modelserver-side enginedirect, per-run

Persistent glossary / brand-voice engine✓–

Bring your own AI key (BYOK)–✓ Lifetime

Facts about Lingo.dev are taken from its own CLI documentation (lingo push/pull, login/API-key requirement). If you want a persistent, configured localization engine, Lingo.dev is a legitimate choice for that job. If you want to translate your repo's files fast without an account, that's what KAERIS is built for.

Why KAERIS

✓ No account to start — free anonymous tier up to 10,000 characters, no credit card. Add a key only for higher limits.

✓ Free offline CI firewall — kaeris check fails a build on missing keys or broken placeholders with no API call and no key.

✓ Repo-native MCP — an agent audits your local files (scan, status, missing keys) with no cost before translating. See the MCP server →

✓ 11 formats, flat pricing — JSON, YAML, .strings, .po, ARB, Android XML, CSV, XLIFF, .properties, .resx, Fluent; no per-seat billing. See plans →

Questions

FAQ

How is KAERIS different from Lingo.dev?

Lingo.dev is a configurable localization engine: its CLI pushes your source content to a server-side engine that holds glossary, brand voice and model config, then you pull results back — it requires a login or API key. KAERIS translates your files directly: no account to start, a free offline check that makes no API call, 11 formats, and a repo-native MCP server. Different shapes — Lingo is engine-and-config; KAERIS is translate-and-ship.

Do I need an account or API key to try KAERIS?

No. The free anonymous tier works with no account, no credit card, up to 10,000 characters per file. A free API key raises that to 50,000; paid plans from $19/mo raise it further, or BYOK on the $79 one-time Lifetime plan removes the monthly cap using your own AI key.

Can KAERIS run in CI like Lingo?

Yes — a GitHub Action with two modes. translate updates locale files and opens a PR; check is a static i18n firewall that runs entirely offline (no API call, no key) and fails the build if a locale is missing keys or a translation broke a placeholder.

Which one should I choose?

If you want a persistent, configured localization engine — server-side glossary, brand voice and model chains your team maintains — Lingo.dev is built for that. If you want to translate the files already in your repo quickly, without an account, with a free offline CI check and a repo-native MCP server, that's what KAERIS is for.

Translate your repo without an account

46 languages, 11 formats, placeholder-safe, with a free offline CI check. Start in seconds.

$ pip install kaeris
$ kaeris translate en.json --langs de,fr,es,ja

Translate your files now →