loper

Loper · Subtitles, captions & localization

Open .arb files on your Mac.

.arb

Application Resource Bundles for Flutter: messages, placeholders and translator notes in JSON.

Loper is a free, minimal editor for macOS that opens Flutter translations (.arb) instantly and colors every part of the file, so you find the value you need at a glance and can fix it right there. No IDE, no project to load, no gray wall of text.

Download Loper – freeAll formats
app_de.arb opened in Loper: Flutter translations (.arb) with color-coded JSON
Show the file as text
{  "@@locale": "de",  "exportButton": "Exportieren",  "@exportButton": { "description": "Main toolbar button" },  "copyProgress": "Kopiere {done} von {total} Dateien",  "@copyProgress": {    "placeholders": {      "done": { "type": "int" },      "total": { "type": "int" }    }  }}

How to open .arb files

  1. Download Loper (free, Apple silicon, signed and notarized) and move it to Applications.
  2. Double-click your .arb file, drag it onto the Loper window, or right-click it and choose Open With › Loper.
  3. Want every .arb file to open in Loper? Choose Loper › Make Loper the Default Editor….

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