The bill comes for six people and you reach for your phone. The sign says 40% off and you cannot tell, standing there, whether that is a good price. None of this is hard. You did it at fourteen without thinking. It just stopped being automatic, and now there is a half-second pause every time, and the pause is the part that bothers you.
The apps that promise to fix this are mostly written for nine-year-olds: mascots, star stickers, a cheer for every correct answer. The other option is a course, with video lessons and a syllabus you will abandon by the second week.
Hone Math (listed on the App Store as Mental Math Puzzles & Practice) is our attempt at a third option. It is an iPhone and iPad app for adults that teaches 66 named methods across nine units, then practises them in short sessions. The interface and the instructional content are available in English and Spanish. Details below are current as of August 2026; apps change.
Speed is a method problem, not a memory problem
Here is the thing most drill apps get wrong. They show you 47 + 38, you get it wrong or you get it slowly, and they show you 47 + 38 again. The assumption is that repetition alone will eventually carve the answer into memory.
For a handful of facts, that works. For everything else it just makes you tired, because you were never slow at recall. You were slow because you were trying to run a paper algorithm in your head: line up the columns, carry the one, hold the carry while you do the next column, lose the carry.
A method replaces that. For 47 + 38, you push the awkward number to a round one: 47 + 40 is 87, then take back the 2, so 85. No columns, no carrying, one thing held in memory instead of three. That is a move you can reuse on hundreds of problems, and it is learnable in about a minute.
Every one of the 66 skills in Hone Math works this way. Each pairs a named method with a plain-language explanation and a worked example, so you see why the shortcut is valid before you are asked to be fast with it.
The nine units, and where adults usually get stuck
The curriculum runs in order, and the order matters.
Foundations builds two habits that make everything after it easier: filling a ten, and finding a difference by counting up instead of subtracting down. Times tables reconstructs multiplication facts from doubling, halving, and friendly multiples, rather than leaning on recall alone. Then mental addition and mental subtraction: round numbers, nearby doubles, a left-to-right running total, counting up, compensation, same-difference moves.
Multiplication and division scale that up with place value, factor moves, numbers near 10 or 100, and the trick of replacing one hard division with repeated halving. Percentages is the unit adults tend to stall on: build from 10% and 1%, flip the calculation when flipping is easier, and work backward from a sale price to the original. That 40% off sign becomes 10% of 65 is 6.50, times 4 is 26, so you pay 39.
Everyday math is the unit people came for. Tips, discounts, bills, change, unit prices, budgets, receipts. Test-style problems closes it out for anyone facing an aptitude test: number series, remainders, last digits of powers, rates, and age puzzles, each broken into small arithmetic relationships.
Nine units, 66 skills, no video lectures.
Three minutes a day is the whole commitment
Practice is deliberately small. Daily Workout is a focused set of 15 problems and takes roughly three minutes. That is the size we think an adult will actually keep doing on a Tuesday in November, which matters more than any single session being impressive.
When you want something different, the shape changes. Smart Set responds to your practice history. Quick Play is a flexible session you configure. Rush is a 60-second challenge for when you want the pressure.
Some days a quiz sounds like homework, so there are also three number puzzles: Make Ten, which works number bonds, Construct, and Cross-Math, an arithmetic crossword that ranges from a compact 3x3 board up to a 10x10 grid. Same arithmetic underneath, different thing to think about.
If you want the streak, there is an optional daily reminder. It is a local notification scheduled on the device at a time you pick, and you can turn it off from the You tab or from iOS Settings. Reminder scheduling is tied to active access. Nothing about your reminder schedule reaches us.
How you can tell it is working
Progress in mental arithmetic is hard to feel from the inside, because getting faster is gradual and you have no baseline to compare against. So the app keeps a Mental Math Index: a rolling score from 0 to 1000 built from the accuracy, difficulty, and speed of your recent submitted answers, computed on the device.
Read it as a practice signal about your recent weeks, not as a lifetime exam grade. It is meant to move when your practice changes, which is exactly what you want from a number you check once a week.
Underneath it, the progress view keeps the detail: trends, records, strengths, weak spots, daily results, and every answer you have submitted. The weak-spot list is the part worth opening. It usually reveals something specific and slightly embarrassing, like the 7 and 8 tables, or subtraction across a zero.
Try the methods before you install anything
We publish the whole curriculum on the web for free. The mental-math methods and practice guide has all 66 explanations and worked examples, plus a fixed, hand-checked 24-problem sampler that covers eight representative moves with revealable steps. It runs in your browser, nothing is sent anywhere, and there is no signup.
That page is the cheapest way to find out whether this approach suits you. Read four or five method explanations. If they click, the app is the generated-practice and progress-tracking version of the same material. If they do not, you have lost ten minutes and no money.
If your gap is narrower than general arithmetic and it is really just multiplication facts, we also have a free times-tables practice page covering 2 to 12. In its Adaptive focus mode, a missed fact returns after two other questions. That page belongs to Quick Math, a separate Studio AM app built around times-table practice for families. It is not the method curriculum described here, so do not expect the two to overlap much.
What it costs, and what happens to your record
Hone Math is free to download, but there is no permanent free practice tier. After onboarding, starting practice requires an active monthly or annual subscription. Eligible new subscribers may receive a 3-day trial. Apple shows the current local billed amount, your eligibility, the renewal period, and the terms before you confirm, so check the App Store for today’s price rather than trusting a number in a blog post. If you bought the old lifetime product before we retired it, it is still honored: choose Restore purchase on the paywall while signed in to the Apple Account that made the purchase.
The data door does not depend on any of that. From the paywall or the You tab, you can inspect every stored answer, day, streak, score, and per-skill result; export complete lossless JSON plus a readable plain-text summary; or delete the local record. That stays available whether or not you are paying. Deleting the record does not cancel an Apple subscription, since subscription management lives with Apple.
There is no Studio AM account, no advertising, no analytics, no tracking, no cloud sync, and no Studio AM server holding your practice history. Problems, curriculum, progress, and the Index all work offline. The connection to Apple through StoreKit is what loads plans, processes a purchase or a restore, and verifies access. Exports leave the app only when you open the iOS share sheet and pick a destination yourself.
FAQ
Is Hone Math built for adults or for children? It is written for adults. The nine units end in everyday arithmetic (tips, discounts, bills, change, unit prices, budgets, receipts) and test-style patterns, and the app does not ask any user to create an account or provide a name or email address. The interface and the instructional content are available in English and Spanish.
How long does a daily session take? Daily Workout is a focused set of 15 problems that takes roughly three minutes. Smart Set adapts to your practice history, Quick Play is a flexible session, and Rush is a 60-second challenge.
What does Hone Math actually teach? It teaches 66 skills across nine units. The units are foundations, times tables, mental addition, mental subtraction, multiplication, division, percentages, everyday math, and test-style problems. Every skill includes a named method, a plain-language explanation, and a worked example.
Can I try the methods without paying? Yes. The free mental-math methods and practice guide on studioam.art publishes all 66 explanations and worked examples plus a fixed, hand-checked 24-problem sampler that runs in your browser. In the app there is no permanent free practice tier; after onboarding, practice requires a monthly or annual subscription, and eligible new subscribers may receive a 3-day trial. StoreKit shows the current local billed amount and renewal terms before you confirm.
Does Hone Math work offline, and where does my progress go? The curriculum, generated practice, puzzles, and progress work offline, and the record stays locally on your device. There is no Studio AM account, advertising, analytics, tracking, or cloud sync. A connection to Apple is required to load plans, purchase, restore, and verify subscription access.
What happens to my record if I stop subscribing? It stays on your device and stays available. From the paywall or the You tab you can inspect every stored answer, day, streak, score, and per-skill result; export complete lossless JSON plus a readable plain-text summary; or delete the local record. Starting new practice requires active access, and deleting the record does not cancel an Apple subscription.