Five ways to be tested
Flashcards, adaptive Learn, type-the-answer Write, a timed Match grid, and full mock Tests with marking.
Remember everything.
Cram nothing.
Nimbus schedules every card for the exact moment you are about to forget it. Desktop, offline-first, and genuinely yours.
Nimbus - Organic Chemistry
24
Due now
18
Day streak
91%
Retention
Nimbus does not invent a learning theory. It implements three that have been replicated for a century.
- Spaced repetition Ebbinghaus, 1885. Reviewing at widening intervals beats massed practice at every retention horizon.
- Retrieval practice Roediger & Karpicke, 2006. Pulling an answer out of memory encodes it better than reading it again.
- Interleaving Rohrer & Taylor, 2007. Mixing topics feels harder in the session and measures better on the test.
The scheduler
Every card gets its own forgetting curve.
Nimbus runs SM-2 with a difficulty factor per card. Grade a card and the interval stretches or collapses. The chart below is live - drag the slider and watch the real scheduler respond.
Built for the whole study loop.
Paste notes, get cards
Drop a block of text and Nimbus splits it on your delimiters, or generates cloze deletions from the sentences you highlight.
photosynthesis - converts light to sugar
mitochondria - produces ATP
ribosome - assembles proteinsStreaks that survive a bad week
Hit your daily card goal to bank the day. Two freeze tokens a month cover the days life gets in the way.
25:00
Focus timer that logs itself
Pomodoro cycles attach to the deck you were in, so your session history is real data rather than a guess.
Offline first, synced when you want
Everything writes to a local database immediately. Sign in and Nimbus reconciles across machines; stay signed out and nothing leaves the laptop.
Pick the pressure.
Each mode trades comfort for retention differently. Nimbus tells you which one the current deck actually needs, including the one for when you have left it too late.
Flashcards
Classic flip with a four-point grade. Keyboard driven: space to flip, 1 to 4 to grade.
Lowest frictionLearn
Starts with multiple choice, promotes to typed recall once you are reliable, demotes the moment you slip.
Best first passWrite
Type the answer. Fuzzy matching forgives typos and accents, and shows a character-level diff when you miss.
Hardest recallMatch
Race the clock pairing terms to definitions. Good for shaking a deck loose when you have gone stale.
Warm upTest
Generates a mixed paper from the deck, marks it, and tells you which cards cost you the marks.
Exam rehearsalCram
The mode this page argues against. Tell Nimbus when the exam is and it spaces what time is left, drops cards once you have recalled them, and shows you what will survive the week after.
When the deadline already wonProgress
Know what you will forget before you forget it.
Nimbus projects your review load forward, flags the cards whose intervals keep collapsing, and shows retention per deck instead of one meaningless global number.
- Leech detection after four lapses
- Forecast of the next 30 days of reviews
- Per-deck retention, not a vanity average
- Year heatmap of every session you logged
Review forecast
0 cards
Year heatmap
Free for one person. Fair for a group.
Solo
Free
Unlimited decks and cards on one machine, forever.
- Every study mode
- Full SM-2 scheduler
- Focus timer and streaks
- Import and export
Sync
$4/month
Everything in Solo, plus your account across devices.
- Sync across unlimited machines
- Publish decks to the library
- Version history on every deck
- Priority on new modes
Class
$3/seat
For a study group, a cohort, or a department.
- Shared deck collections
- Group progress overview
- Assign decks with due dates
- Self-hosted server option
Start the first review today.
Nimbus is a real desktop app. Download it, open it, and your first deck takes about two minutes.