Proofreading API for spell and grammar checking

You're looking for an easy to use spell check API to integrate into your software? Then you've come to the right place. LanguageTool Enterprise offers spell and grammar checking using one common API, even for multiple languages.

Our API is already successfully used by web agencies, websites and software companies.

Details

  • Spell checking: based on the Hunspell dictionary also used by LibreOffice/OpenOffice, but with more than 10,000 new entries (all checked manually)
  • More than 2,000 error detection rules for English that go beyond spell checking and can find errors depending on context. For example:
    • Uppercase: This house is old. it was built in 1950. → This sentence does not start with an uppercase letter
    • Grammar: Please answers quickly. → Did you mean "answer"?
    • Punctuation: "I'm over here, she said. → Unpaired symbol: " seems to be missing
    • Confused words: They were largely on there own that night. → Did you mean "their"?
    • Date check: It was released on Thursday, 27 June 2017. → The date 27 June 2017 is not a Thursday, but a Tuesday.
  • HTTP API using JSON as its output format. The input is just plain text. The text language can be detected automatically.
  • Unlike services such as Grammarly, we support English and German and offer basic support for 12 additional languages: Catalan, Chinese, Dutch, French, Greek, Italian, Japanese, Persian, Romanian, Russian, Spanish, Ukrainian
  • Performance: about 300 ms per 1000 characters
  • Proven technology: we check more than 500,000 texts every day for our websites and browser add-ons
  • Available as a cloud API or as an on-premise solution to meet any privacy requirements

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