Numeos

For iPhone

Mental math,
trick by trick.

A feed of mental-math puzzles you can swipe like a timeline. Tap a card and it gives you the answer, and then the shortcut that gets you there without a pen.

Coming to the App Store

The trick, not just the answer

An answer on its own teaches you nothing. Every card names the shortcut behind it, then opens onto the worked steps one at a time, plus a short explanation of why the shortcut is allowed at all.

48 × 25

1,200

Quarter of a hundred
  1. 25 is 100 ÷ 4, so multiply by 100 and take a quarter.
  2. 48 × 100 = 4,800.
  3. 4,800 ÷ 4 = 1,200.

Break the tens. Anchor at 50. Build it from 10%. Pay the complement. Take the gap out first. Numeos names each one as it uses it, so the method is what you keep, not the particular numbers.

Nine cards, then a quick three-option test on one of the nine you have just read. Being asked about something you have just seen is the point: a fresh question would only measure what you already knew. The wrong options are near-misses built by nudging the real answer, so there is not much in guessing.

Built on your phone, not fetched

Numeos has no list of questions to run out of. Every card is generated at the moment you reach it, which is also why none of it needs a network.

58

Problem types

Across ten topics, generated fresh. Scroll back and the cards are where you left them; tomorrow brings a new set.

✈

Works on a plane

The feed, Practice, your saved cards, your streak and your numbers all run on the device with no network at all.

10→50

Points and tiers

A test pays 10 points at Gentle, up to 50 at Expert, and answering quickly earns up to that much again. Bronze to Diamond.

0

Accounts required

No sign-up wall, no email to confirm, nothing to skip past on first launch. Never sign in and nothing ever leaves the phone.

A look at it

Captured from the app running on an iPhone. Nothing here is a mockup.

A card asking a multiplication question. The same card turned over, showing the answer and the named shortcut. The worked solution, one step at a time. Ask AI: the on-device tutor walking through the steps, with the conversation's follow-up questions below. A quick test with three options. Streak, daily goal and a seven-day chart. Points and tier on the leaderboard.

For whoever picks it up

The same feed reads differently in different hands. A card takes half a minute, so it fits wherever half a minute happens to be.

A family of four laughing around a kitchen table while a kid holds a phone up in triumph.
Match night in the kitchen. A group lives behind a six character code, so the youngest can be the one who starts it.
A commuter smiling at her phone on a subway platform as a train passes behind her.
The feed works underground. Every card is built on the phone, so a tunnel does not interrupt it.
Three friends on a sofa at night, phones in hand, one laughing with his head thrown back.
Ten questions, served to everyone at once, with the table moving while you watch. Somebody always shouts.
An older man in a cardigan and reading glasses smiling at a phone in an armchair by a lamp.
Ten at night, one more card. No account to make, nothing to set up, nothing asked of you at all.

These scenes are rendered, not photographed. The screenshots above are the real thing.

And, if you want company

Groups: up to thirty people behind a six-character code, playing a season of ten live matches. Whoever starts the group picks the night, the hour, how often it comes round (every day, every week or every month) and the difficulty, from elementary to Fields Medal. Ten questions served one at a time, with the table moving while you watch, and a lobby to talk in before the first question; nothing said there is ever stored. Entirely optional, the rest of the app never asks about it.

Live at the hour your group chose, in your group's time zone

Ten topics

Follow all ten, or narrow it to the one you want to get good at.

MultiplyingSquaresPercentsFractionsSequencesAlgebraProbabilityEstimationWord problemsQuant
Oversized serif numerals pressed into cream paper, one in the app's teal and a small coral dot.

No adverts. No analytics.
No tracking. No account required.