Santa by Socra AI (formerly Riiid)
AI test prep, best known for TOEIC
Riiid renamed itself Socra AI; its TOEIC tutor is still called Santa (checked 4 October 2026).
The Four Mismatches · Santa by Socra AI (formerly Riiid)
Fits on everything we could check
For a student in South Korea, the country it was built for.
CurriculumNo exam claimed
It names no school exam, so this counts neither for nor against it.
LanguageFits
Teaches in the classroom languages of South Korea.
- The maker lists: Korean
- Classrooms in South Korea use: Korean
PriceNot verified
We haven't found its price on the maker's own pages.
DeviceFits
Works on a laptop or tablet, what most students in South Korea use.
Independence: our publisher builds learning products too. We never review or score its products, and no tool pays to be listed or to rank higher — how we assess fit.
What it does
What the AI actually does — Knowledge-tracing deep-learning models estimate what a learner knows from answer history and serve the next question predicted to most raise their score; open-sourced the EdNet dataset (~131M interactions).
Why it was built — Use knowledge-tracing AI to hit a target score with the fewest questions, then generalise the engine to other exams.
Who built it
- Company
- Riiid Labs, Inc.
- Founders
- YJ Jang · Jaewe Heo · Minsung Noh
- HQ / origin
- Seoul, South Korea
- Founded
- 2014 (Santa launched 2017)
- Model
- B2C / B2B
- Exam systems
- TOEIC · later SAT
- Languages
- Korean · Japanese · English
We record durable facts only — no funding-raised or user-count figures. Unverified fields are marked [TBD] rather than guessed.
Where it sits
Santa by Socra AI (formerly Riiid) is on the Learning Tools Index, in exam prep & regional platforms, built in South Korea.