One pass unlocks everything
The basics of every word and root are free, and the 5,000 most common words are free in full. Pro unlocks the in-depth layer of the rest — and every course: Basics, GRE, TOEFL, and whatever we add next.
Definitions, pronunciation and morpheme structure for 18,000+ words & 600+ roots · the 5,000 most common words in full · all collections & articles · My Words — no account needed.
Monthly
Best for a short exam sprint. Cancel anytime.
- Full depth on every word & root — morpheme meanings, senses, examples, usage, etymology stories
- All root courses
- Retry-until-correct quizzes
- Progress & scores saved
Billed $20/month · cancel anytime
Lifetime
Pay once, unlock everything forever — every word, every root, every course, including future ones.
one-time · lifetime access
- Everything in Monthly
- All future courses included
- No subscription, no renewals
Business & Data
Building a product, course or research project on etymology data? Licence the full dataset instead of scraping.
- Full structured dataset: 18,000+ words, 600+ roots, morpheme breakdowns, senses, examples, etymology stories
- Commercial-use licence with periodic data refreshes
- Content data only — never any user data
- Custom exports or API access on request
Automated scraping is not permitted under our Terms — licensing is the supported way to get the data.
Frequently Asked Questions
What is the difference between monthly and lifetime?
Monthly ($20/mo) suits a short exam sprint — cancel anytime. Lifetime ($49, one payment) unlocks every course forever, including future ones, and works out cheaper the moment you study for more than a couple of months.
Which courses does Pro include?
All of them: Root Mastery Basics, the GRE Root Course, the TOEFL Root Course, and every course we add later. One pass, no per-course fees.
Do roots and words cost anything?
The basics never do: definitions, pronunciation, morpheme structure, collections and articles for every word and root are free without an account, and the 5,000 most common words — plus the roots built from them — are free in full. Pro unlocks the in-depth layer of the less common ones: morpheme meanings, senses, examples, usage notes, etymology stories and memory tips.
Can I use the data in my own product or research?
Yes — we license the full word and root dataset (content data only, never any user data) for commercial and research use. Email support@wordiyo.com. Automated scraping of the site is not permitted; see our Terms of Service.
Will I lose my data?
No. Your vocabulary book and mastery data are always yours, free plan or not.