Other apps give you four cards for run · runs · ran · running.
CoreWords gives you one — and schedules it using FSRS, the most accurate spaced-repetition algorithm available.
Fully local. No account. Any browser.
CoreWords is in the final stretch — we’re fixing the last few rough edges before opening it up. Leave your email and we’ll reach out the moment it’s ready. A few optional questions help us get the first release right.
Why CoreWords
Most apps are built around individual word forms. CoreWords is built around vocabulary concepts — the way a linguist, or a fluent speaker, thinks about words.
run · runs · ran · running is one vocabulary concept, not four. CoreWords groups all grammatical forms together, so your deck count reflects the words you actually know — not an inflated list of variants.
Frequency lists let you spend your study time where it matters. CoreWords is built around the top-X most common words in a language — the ones you’ll actually encounter and use every day.
CoreWords uses FSRS (Free Spaced Repetition Scheduler), the current state-of-the-art algorithm. It predicts your forgetting curve and schedules each review at exactly the right moment for maximum retention.
Everything lives in your browser — no signup, no server, no cloud sync. Your progress is stored privately on your device and can’t be lost to a service shutting down.
Built as a responsive web app that works beautifully on Android, iPhone, laptop, or desktop — in Chrome, Firefox, Edge, or Safari. No install required.
Mark a card as permanently learned. Hide it for a week. Study whole conjugation tables, split a grouped card into individual forms, or suspend words you don’t need yet. CoreWords adapts to how you want to learn.
How it works
Choose your native language for the interface, then pick a target language to study. Start with English, Czech, or French — more coming soon.
Study whole word families, grammar tables, or individual forms. Start with the top-10 most frequent words and expand at your own pace.
Rate each card — Again, Hard, Good, or Easy. FSRS schedules the next review automatically. The more consistently you study, the longer the intervals grow.