Five everyday sums.Can you make change?
Try a café bill, a train journey and three other quick calculations. Enter one answer at a time, then read the method before moving on. You can take as long as you like.
Five everyday sums, at your pace
0.0seconds recordedUntimed by default. Switching this option starts a fresh round. The optional timer starts at your first typing in each sum and pauses at Check or Skip. No deadline or speed ranking.
Type an answer, then press Enter or Check. Read the worked answer before moving on. Skip any sum.
Try a different kind of puzzle next.
Cognilo’s free Daily 5 mixes memory, focus, logic, numbers, spatial and language puzzles. Start an untimed session on iPhone or iPad and see a strategy tip after each round.
Try Cognilo’s free Daily 5 on the App Store ↗Optional Pro adds Lab challenges and reports. This browser score stays here; it does not transfer to the app.
For ongoing practice on iPhone, Cognilo includes Real Numbers alongside other puzzle types. Its free Daily 5 mixes puzzle categories. The browser drill above scores only the five answers you give here.
Questions you will have
Does practising sums make me better at sums?
Yes, and that is nearly all the research supports. The 2016 Simons review in Psychological Science in the Public Interest found people tend to improve on the specific tasks they practise, with little evidence for broad transfer to other tasks. So: practise the sums you actually meet, which is what Cognilo's Real Numbers round is.
Will a brain-training app make me smarter or protect my memory?
No app on this page claims that, and Cognilo's listing says its ratings describe how you play Cognilo puzzles and are not a measure of intelligence or health. In 2016 the FTC fined Lumosity $2 million over claims like that and required competent and reliable scientific evidence for any future benefit claims.
How long is a session?
About six minutes for the Daily 5 at a typical pace, per the listing; days with the Market Run shopping scenario take a little longer, and after a few rounds the app shows your own estimate before you start.
Is it timed?
Cognilo is untimed by default (Precision); Sprint adds a timer and Zen is unrated. This browser drill is also untimed by default. An optional timer records time from your first typing in each sum until Check or Skip, excluding the explanations. Changing that option starts a fresh round. There is no deadline.
Is Cognilo free?
The free tier is complete, per the listing: the Daily 5, all six skills, ratings, the Benchmark and achievements. Pro is an optional monthly or annual subscription for the Performance Lab (Pressure Response, Interference), weekly and monthly reports, and up to 12 months of rating history.
Do I need an account?
No. Local-first, no ads, no tracking; history stays on the device and exports as JSON. Purchases and optional Game Center leaderboards need a connection; competition is off by default.
What we will not claim
- No transfer promise.Practising sums improves sums. The 2016 Simons review found little evidence that brain-training gains transfer broadly; we are not going to tell you otherwise, and the app's listing says ratings are not a measure of intelligence or health.
- There is a subscription.Cognilo Pro, monthly or annual, for the Performance Lab and reports. The free tier is complete and you can tap Continue Free on the paywall.
- Ratings move slowly on purpose.Performance Ratings only move when several sessions agree, and the Benchmark uses held-out rounds. If you want a number that jumps after a good morning, this will frustrate you.
- New app.The App Store listing shows the current version and device requirements.
How a day works
- Open it; the first puzzle starts.No sign-up, no questionnaire. Five rounds from five of six categories: memory, focus, logic, numbers, spatial, language.
- Get a result and a tip per round.Plain-language reason for why that puzzle was picked, a strategy tip, pace versus accuracy, and an unrated Review replay of anything that slipped.
- Come back tomorrow, or not.Rhythm counts days per week rather than a streak; Grace and Vacation cover busy weeks. Nothing punishes a missed day.
See the real app before you install
These are current Cognilo App Store screenshots, not a browser mock-up. They show the Daily 5 entry point, the available skills and modes, an actual untimed puzzle, and the separate Benchmark view.
Who should not bother
- Anyone wanting a cognitive assessment. See a clinician. This is a puzzle app and says so.
- Children. It is a puzzle game for adults, per the listing; the sums are rent and restaurant bills, not homework.
- People who want a streak to chase. Rhythm counts days per week instead. If the streak is your fuel, pick something else.
- Android. iPhone and iPad only, iOS 18.
Yours, with the calculator still in the drawer,
Honest Little Apps
Play free on iPhone
Cognilo: Brain Training Games. Five puzzles, about six minutes, untimed by default. No account, no ads, works offline. The free tier is complete.
Open on your iPhone
On another device? Scan with your iPhone Camera, then tap the link.
Open Cognilo: Brain Training Games on the App Store
The code opens the App Store. It does not transfer entries or results from this page.
Sources
- Simons, D. J., et al. (2016). Do “Brain-Training” Programs Work? Psychological Science in the Public Interest. Summary: University of Illinois News Bureau (people improve on the specific tasks they practise; little evidence for broad transfer).
- Federal Trade Commission, 5 January 2016: Lumosity to Pay $2 Million to Settle FTC Deceptive Advertising Charges.
- Cognilo: Brain Training Games on the App Store, listing read 4 November 2026 (version 1.2.0): Daily 5, puzzle list, modes, ratings and Benchmark, free tier and Pro, privacy.
Honest Little Apps created these five sums. Answers and optional timing stay in the browser for this round; they are not saved or sent to Cognilo.
Useful for someone else?
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Open the public guide link