Remember everything.
Cram nothing.

Nimbus schedules every card for the exact moment you are about to forget it. Desktop, offline-first, and genuinely yours.

Download Nimbus See the method
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.

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.

Studied once Reviewed on the Nimbus schedule

Built for the whole study loop.

Five ways to be tested

Flashcards, adaptive Learn, type-the-answer Write, a timed Match grid, and full mock Tests with marking.

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 proteins
18

Streaks 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 friction

Learn

Starts with multiple choice, promotes to typed recall once you are reliable, demotes the moment you slip.

Best first pass

Write

Type the answer. Fuzzy matching forgives typos and accents, and shows a character-level diff when you miss.

Hardest recall

Match

Race the clock pairing terms to definitions. Good for shaking a deck loose when you have gone stale.

Warm up

Test

Generates a mixed paper from the deck, marks it, and tells you which cards cost you the marks.

Exam rehearsal

Cram

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 won

Progress

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.

Free, and finished.

Solo

Free

The whole app on one machine, forever. No account needed.

  • Every study mode
  • Full SM-2 scheduler
  • Focus timer and streaks
  • Import and export
Download

Nimbus Pro

CA$4.99/month

Everything in Solo, plus the same decks on every machine.

  • Hosted sync across unlimited machines
  • Share a deck with a private link
  • Ask about the card you are studying
  • Draft cards from a PDF or a PowerPoint
  • Publish decks to the public library
  • Your review history follows you
  • Cancel in one click, any time
Get Nimbus Pro

Nimbus Pro Lifetime

CA$25once

Everything in Nimbus Pro, paid for once instead of every month.

  • Every Pro feature, with nothing held back
  • The AI features, on the same daily allowance
  • No renewal and no card kept on file
  • Already subscribed? It cancels your subscription for you
  • For as long as the hosted service runs
Get Lifetime

Nimbus Pro

Later

Hosted sync between your machines, when it is ready.

  • The same decks on every machine
  • Publish decks to a public library
  • Your review history follows you
Not available yet

Class Planned

$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
Not available yet

Nimbus Pro pays for the parts that run on a server, which are the parts that cost money to run. Everything the app does on your own machine is free and stays free: all six study modes, the cram planner, the focus timer, progress, import and export, and unlimited decks and cards, with no account at all. The AI features send text to a model provider and a model can be wrong, so generated cards are always shown for you to check and edit before they are added. What is sent and what is kept is set out in the privacy policy. The sync server is in the repository under an MIT licence, so you can also run it yourself and pay nothing. Class is not built yet and cannot be bought. Cancelling takes one click. See the refund policy.

Prices exclude sales tax, VAT and GST. The exact total for your country is shown at checkout, before you pay. Nimbus Pro is sold by Stripe, which handles the payment, the tax and the receipt, so the purchase appears as Sold through Link and on your statement as LINK.COM. The terms and the privacy policy say what that means.

Nimbus takes no payments at all today. Nothing on this page can charge you, and there is nothing to subscribe to. The app is free and complete right now: all six study modes, the cram planner, the focus timer, progress, import and export, and unlimited decks and cards, with no account and no network. Hosted sync is what the paid plan will eventually cover, and the sync server is already in the repository under an MIT licence if you would rather run it yourself. See the refund policy.

Start the first review today.

Nimbus is a real desktop app. Download it, open it, and your first deck takes about two minutes.

Requires macOS 11, Windows 10, or a modern Linux desktop.