loper

Loper · Subtitles, captions & localization

Open .xcstrings files on your Mac.

.xcstrings

Xcode 15+ keeps every language in one JSON catalog: keys, states and translations.

Loper is a free, minimal editor for macOS that opens Xcode string catalog (.xcstrings) 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.

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Localizable.xcstrings opened in Loper: Xcode string catalog (.xcstrings) with color-coded JSON
Show the file as text
{  "sourceLanguage" : "en",  "strings" : {    "Export" : {      "localizations" : {        "de" : { "stringUnit" : { "state" : "translated", "value" : "Exportieren" } },        "fr" : { "stringUnit" : { "state" : "needs_review", "value" : "Exporter" } }      }    }  },  "version" : "1.0"}

How to open .xcstrings files

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

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