Compare ICU source and translation messages

Paste the source message and its translation to compare their structure. Confirm the final messages with your production ICU or i18n library.

Runs locally in your browser

Messages are parsed entirely in this browser. They are not uploaded, translated, or stored by KivTools.

Source ICU message

Translation ICU message

Message compatibility report

—Source arguments

—Translation arguments

—Issues

INFOPaste both messages, then run the local compatibility check.

Catch translation contract mistakes before rendering

The checker validates practical ICU MessageFormat structures, including nested arguments, select branches, plural/selectordinal fallbacks, and placeholder parity. It is a review aid, not a replacement for rendering messages with your production i18n library.