Similarity Texter

Additional Information


Software Profile | Description | Pros & Cons | Coverage results | Usability results | Screenshots

Software Profile

Software-TypeOnline, can be integrated with API and WordPress
Contact sales
Test DateNovember 2018 – November 2019


Copyscape declares itself to be a plagiarism checker. The primary aim is to provide a tool for owners of websites to check if their original content was not used by others. They also provide a service of regular checks and email alerts. Copyscape, which started in 2004 (Greenspan, 2019), is operated by a private company, Indigo Stream Technologies Ltd., which is apparently based in Gibraltar. It does not have its own database but uses Google services to crawl the web.

Pros & Cons

  • Copyscape system found more than half of similarities in manually paraphrased text when one Wikipedia article was used for English, German, Czech and Turkish languages.
  • Can upload url or paste text for testing, but not a document.
  • The system did not find any similarities (more than one sentence) in both manually and human translated texts.
  • This system has very low usability results – test results are displayed online and can’t be saved or downloaded, evidence of similarity is not displayed side-by-side with the source.
  • After seeing results, if user again presses to test the same text, system again takes money and shows the same results.

Coverage results

Single source

Multi source

Usability results

Workflow process usability

  • Can upload and test multiple documents together
  • Auto-fill metadata for documents
  • The system uses original file names for report
  • There are no word limit for the testing document
  • The system display text in the chosen language only
  • The system can process large documents (for example, a bachelor thesis)

Result presentation usability

  • Reports are downloadable
  • Results are saved in the user’s account and can be reviewed afterwards
  • Matched passages are highlighted in the online report
  • Matched passages are highlighted in the downloaded report (offline)
  • Evidence of similarity is demonstrated side-by-side with the source in the online report
  • Evidence of similarity is demonstrated side-by-side with the source in the downloaded report
  • Document formatting is not changed in the report
  • Document page numbers are shown in the report
  • The report is not spoiled by false positives

Other usability aspects

  • System costs are clearly stated in the system homepage
  • Information about a free system trial version is advertised on the web-page
  • The system can be integrated as an API to a learning management system
  • The system can be integrated with the Moodle platform
  • The system provides call support
  • The call support is provided in English
  • English is properly used on the website and reports
  • There are no external advertisements



Greenspan, G. (2019). Gideon Greenspan. Retrieved from

Company Statement