Formuls — 392 physics formulas you learn to recall, not just look up
Formuls is a physics app for students preparing for school-leaving and university entrance exams. It combines a reference of 392 formulas with exercises that train recall: swipe cards, choosing the right equation, rebuilding a formula from fragments and spaced reviews. We designed and built the web app, the installable version for phones and the Formuls Plus subscription.
Challenge
Physics formula sheets are easy to find and hard to remember. Students reread the same pages before an exam, recognise a formula when they see it and still cannot write it down from memory. Notation adds to the confusion: the same letter means voltage in one textbook and work in another. The founders wanted a product that turns a reference into a daily habit of five to fifteen minutes, works on the phone a student already carries, and stays useful even without a subscription.
Approach
We built Formuls around one sequence: understand, test yourself, remember. Every formula has its own page with the equation, each symbol and its unit, and every exercise type asks for a little more recall than the last, from recognising an equation among four to restoring it from fragments. Answers feed spaced reviews, so a formula returns just as it starts to fade. The reference and basic practice are free; Plus adds the harder exercises, the learning path and detailed progress.
A reference that explains every symbol
The catalogue holds 392 formulas across six areas of physics: mechanics, thermal physics, electricity and magnetism, oscillations and waves, optics, and atomic and nuclear physics. Search works by name, topic, symbol or physical quantity, so a student who only remembers that the answer involves g still finds it.
Each formula page shows the equation, properly typeset, and a table of its symbols with their meaning and SI unit. A short note on notation explains that letters differ between textbooks and countries, and that the page's own definitions apply: U may be voltage, and A may be work.
Try it before signing up
The home page does not ask for an account. Three formula cards sit next to the headline: tap a card to reveal the formula, swipe right for "Know it" and left for "Don't know". In ten seconds a visitor has done the exercise the product is built on, which explains Formuls better than any feature list.
Practice that climbs from recognition to recall
A lesson takes up to five formulas and moves through three steps: meet the new formulas, practise them, see the results. Mistakes come back within the same lesson until the student answers correctly without opening a hint, and the first answer is recorded separately from any later correction, so progress reflects what the student actually knew.
The exercise types ask for more each time:
- Self-check cards: reveal a formula and judge yourself, with an undo for a mis-swipe.
- Choose from four: find the correct equation among plausible distractors.
- Rebuild from fragments: restore the right-hand side of a formula from quantities, with some fragments deliberately not needed.
- Mixed checkpoint: up to 15 questions across everything studied, where checked answers and self-assessment are kept apart.
Answers feed spaced reviews. A formula a student recalls with confidence returns less often, and one they struggle with comes back sooner.
A path through physics
"My learning" turns the catalogue into a route of 28 topics in a sensible order, from kinematics and dynamics to nuclear physics. The next step is always on top, with the number of new formulas waiting in it. Every topic stays open, so a student who needs electrostatics for tomorrow's test can go straight there. Reviews strengthen the topics they belong to without being counted twice as newly studied.
On the phone, like an app
Students revise in short sessions on their phones, so Formuls is built phone-first, with a floating tab bar for Home, Formulas, Progress and Plus. It installs from the browser to the home screen on iPhone and Android, and an Android build is available as well. Once loaded, the catalogue works offline, so formulas are at hand on the bus or in the exam corridor.
The interface runs in English and Russian with light and dark themes, and one Plus account works across both language versions.
Free first, Plus for depth
The reference, self-check cards and quick practice are free, which keeps Formuls useful to every student who finds it. Formuls Plus adds rebuilding formulas, mixed lessons, spaced reviews, checkpoints, explanations with examples and detailed progress, with a seven-day trial to try it.
Build
Formuls is a React application built with Vite, with formulas rendered by KaTeX, accounts and progress in Supabase, and an offline-capable web app powered by a service worker. The Android build is packaged with Capacitor from the same code. Analytics only use cookies after consent.
Formuls combines our product design and web and mobile development. For another learning product of ours, see Copilot EGE, an adaptive maths exam platform. Planning an app of your own? Our guide to what a SaaS MVP costs shows where the budget goes, or tell us about it.
What shipped
- Reference of 392 formulas with symbols, SI units and search by symbol or quantity
- Self-check cards, choose-from-four, rebuilding from fragments and mixed checkpoints
- Spaced reviews and a learning path of 28 topics with progress tracking
- Installable app for iPhone and Android with an offline catalogue
- Formuls Plus subscription with a seven-day trial, in English and Russian
Frequently asked
A physics app that combines a reference of 392 formulas with exercises for remembering them: self-check cards, choosing the right equation, rebuilding formulas from fragments, spaced reviews and checkpoints.
Students preparing for school-leaving and university entrance exams in physics, and anyone who needs physics formulas at hand and wants to recall them without a cheat sheet.
The formula reference, self-check cards and quick practice are free. Formuls Plus adds rebuilding formulas, mixed lessons, spaced reviews, checkpoints, explanations and detailed progress, with a seven-day trial.
Yes. Formuls is built phone-first, installs to the home screen on iPhone and Android, and keeps the catalogue available offline once it has loaded.
English and Russian. One Plus account works across both versions.
Inside the site
“We wanted students to stop rereading formula sheets and start remembering them. Sakura turned that idea into exercises that feel like a game but actually work, and built it so it lives on the phone like a real app. Five minutes on the bus now counts.”