Quizlet is the biggest free flashcard platform in the world — millions of user-made decks, including thousands for the NCLEX, NHA certifications, and the TEAS, with a paid Plus tier that lifts limits on its Learn and test modes. Trelos is a complete daily study system built per exam: authored concepts in the exam's own structure, exam-style questions with explanations, and review scheduled across days and weeks, not sessions. Quizlet is free vocabulary drilling at any scale; Trelos is a curriculum that decides what you review tomorrow. It does not include user-generated decks or a card-creation tool.
Quizlet is a general-purpose study tool: anyone can create a flashcard set, and nearly everything has one. Flashcards and the Match game are free without limit; the Learn mode (mixed-format questions that bring back terms you miss within a session) and practice tests are capped daily on the free tier, per current reviews. Quizlet Plus — $7.99 a month or $35.99 a year — raises those caps, removes ads, and adds offline study; a Plus Unlimited tier at $44.99 a year removes them. Decks are user-made, so accuracy and coverage vary by author, and nothing ties a deck to a specific exam's content plan. Current plans are on Quizlet's upgrade page.
Trelos is a mobile-first retention engine with a separate, authored track per exam. Every concept runs the same loop: guess first, short lesson, practice, then scheduled review timed to just before you'd forget — across days, not within one sitting. Confident mistakes come back first; practice is interleaved. Tracks include the NCLEX-RN (216 questions across 36 concepts), NCLEX-PN (216 across 36), CPT phlebotomy (168 across 28), CMAA (94 across 24), and CCMA (180 across 30), each organized by that exam's official sections. Standard multiple choice with an explanation on every answer; the NCLEX tracks include six clinical-judgment cases written as standard questions, with no NGN item formats such as bowtie, matrix or extended drag-and-drop. You can't upload your own cards — the content is the product.
| Trelos | Quizlet | |
|---|---|---|
| Content | Authored per exam, aligned to the official content plan | User-made decks; accuracy and coverage vary |
| Explanations | Every question | Depends on the deck author |
| Spaced review | Automatic, across days and weeks | Learn mode re-asks misses within a session; limited cross-session scheduling, per reviews |
| Question format | Exam-style multiple choice | Flashcards, matching, Learn, practice tests |
| Exams | Separate tracks: NCLEX-RN/PN, NHA certs, TEAS, HESI, FINRA, CFA, real estate | Any subject with a deck |
| Access | 12 months, one payment | Free; Plus $7.99/mo or $35.99/yr |
| Price | Free to start · from $14 launch price (from $29 after Nov 30) · pass guarantee | Free; Plus from $35.99/yr |
| Best for | Learning and keeping an exam's full content plan | Fast, free drilling of terms and definitions |
Choose Quizlet if you need free term drilling at scale — drug names, lab values, medical terminology — and you're willing to vet decks yourself or build your own.
Choose Trelos if you want the exam's actual content plan taught in order, explanations on every miss, and a system that schedules your reviews across the weeks before test day without you managing a deck.
Quizlet's price is unbeatable and its vocabulary drilling is genuinely useful. Its limits are the ones free, user-made content always has: no guarantee the deck matches the current exam, no explanation when you're wrong, and nothing that returns a concept on day three, ten, and thirty — the schedule that decides whether week one survives to test day. Trelos is built around exactly that schedule, with authored content in the exam's structure. Its first topics are free with no sign-up to start; one payment buys 12 months, extended free if you meet the guarantee's conditions and don't pass.
Pass guarantee: learn every concept in your track and keep up your scheduled reviews, and if you still don't pass, your access is extended free — three more months per attempt — until you do. It's an extension, not a refund.
Preparing for the NCLEX, an NHA certification, or the TEAS? Pick your track:
No credit card. Feel the retention engine work in your first session.
Related: Free NCLEX Practice Questions · Free CPT Practice Questions · CCMA Study Plan, or browse all Trelos exam guides.
How Trelos works · why guessing first, spaced review and mixed practice make it stick.
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