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Rule "missing hyphen in 'in app'"

This is one of many errors that LanguageTool can detect.

Description: missing hyphen in 'in app'
Message: The adjective <suggestion>\3-\4</suggestion> is spelled with a hyphen.
Category: Grammar (ID: GRAMMAR)
Link: https://languagetool.org/insights/post/hyphen/#compound-adjectives-with-hyphens
Incorrect sentences
that this rule can detect:
  • Most of their revenue came from in app purchases.
    Correction suggestion: in-app
Correct sentences
for comparison:
  • Only Tech Support can knock out a logged in App session.
ID: IN_APP_HYPHEN [2]
Version: 6.6-SNAPSHOT (2024-11-24 22:33:09 +0100)