Stop forgetting the words you've already learned.
You pick up new vocabulary from Netflix, ChatGPT, tutors, and textbooks every day — then forget 80% within a week. iwill.study captures words from any source and uses science-backed spaced repetition to make them stick permanently.
iOS app coming soon
Front
Água mole em pedra dura, tanto bate até que fura
Back
Soft water on hard stone, hits until it pierces
"Persistence beats resistance — like learning vocab"
Features
Everything you need to learn faster
Traditional flashcard apps make you build everything from scratch. Gamified apps teach you words you'll never use. iwill.study gives you science-backed results without the busywork.
FSRS Algorithm
Science-backed spacing that adapts to how your memory actually works. No more guessing when to review — the algorithm decides for you.
Anki-Compatible API
Push new words from ChatGPT, Claude, or any app straight into your decks. Our open API works like Anki — collect vocabulary from anywhere you learn, automatically.
AI-Powered Cards
Paste any text and get study-ready flashcards in seconds. Or import your existing Anki .apkg decks with all progress and tags intact.
Offline Study
Download your decks and learn anywhere — on the subway, on a plane, in the mountains. Sync when you're back online.
31 Languages
Pre-built packs for English, Spanish, Japanese, French, German, Portuguese, Korean, Chinese, and more. Create decks in any of 31 supported languages.
Cross-Platform
Study on iOS and web, always in sync. Start a session on your phone, finish it on your laptop.
How it works
Three steps to fluency
No complicated setup. Start learning in under a minute.
Collect from Anywhere
Push words from ChatGPT, Claude, or any tool via our API. Import Anki decks. Or create cards manually.
Collect from Anywhere
Push words from ChatGPT, Claude, or any tool via our API. Import Anki decks. Or create cards manually.
Study Daily
Our FSRS algorithm shows you the right card at the right time — no manual scheduling.
Study Daily
Our FSRS algorithm shows you the right card at the right time — no manual scheduling.
Master It
Watch your knowledge grow with streaks, progress tracking, and long-term retention stats.
Master It
Watch your knowledge grow with streaks, progress tracking, and long-term retention stats.
Results
Learners love the results
90%
long-term retention with FSRS
5 min
average daily study session
31
languages supported
I was using Anki for years but hated building cards manually. Now I push words from ChatGPT straight into my deck. Game changer.
Marco R.
Software engineer, São Paulo — Learning Japanese, 8 months
Duolingo taught me to say 'the cat drinks milk' but not the words I actually hear in conversations. iwill.study lets me learn what matters.
Yuna K.
Graduate student, Seoul — Learning English, 4 months
I used to write vocab in a notebook and never look at it again. Now the app tells me exactly when to review. My retention went through the roof.
Lena W.
Product designer, Berlin — Learning Spanish, 6 months
Pricing
Start free, upgrade when you're ready
No credit card required. Cancel anytime.
What vocabulary learning actually costs
The price of one snack per month for vocabulary that lasts a lifetime.
For dedicated language learners
or $2.50/mo billed yearly (save 37%)
Free $0forever Perfect for getting started | Popular Pro $3.99/mo For dedicated language learners | |
|---|---|---|
| Decks | 5 | Unlimited |
| Total cards | 1,200 | Unlimited |
| Local file imports | ||
| API access | 100 cards/day | Unlimited |
| Language packs | 3 per language | All packs |
| AnkiConnect sync | ||
| Export decks | ||
| Stats history | 30 days | Unlimited |
| Get Started Free | Start Pro Trial or $2.50/mo billed yearly (save 37%) |
Every word you learn today stays with you forever.
Learners in 40+ countries use science-backed spaced repetition to build vocabulary that actually sticks.
Free forever. No credit card required.