Turnitin
Similarity and AI-writing checks
Independence: Addestra builds learning products too (MathsTutor, TinkerWell). We never review or score our own, and no tool pays to be listed or to rank higher — how we assess fit.
What it does
What the AI actually does — Text-similarity matching against a large indexed corpus, plus an AI-writing-detection feature flagging passages statistically likely to be LLM-generated.
Why it was built — Academic-integrity infrastructure — check student work for originality against the web, publications and a huge archive.
Who built it
- Company
- Turnitin (iParadigms)
- Founders
- John M. Barrie
- HQ / origin
- Oakland, California, USA
- Founded
- 1998
- Model
- B2B / B2G
- Ownership
- Owned by Advance Publications (acquired 2019)
- Languages
- Multiple
We record durable facts only — no funding-raised or user-count figures. Unverified fields are marked [TBD] rather than guessed.
Where it sits
Turnitin is on the EdTech AI 100 map, in assessment & academic integrity, built in United States.