# Carry the One: Mental Math — Train the method, not the fact

> Train the method, not the fact (iPhone/iPad app by Lars Haneveld.)

- Source: https://appshunter.io/ios/app/carry-the-one-mental-math/id6792379525 (this page in markdown: same URL + `.md`)
- Developer: [Lars Haneveld](https://appshunter.io/developer/6792379527)
- Category: Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 23 MB
- Languages: American English, German (Germany), European Spanish
- Released: 2026-09-03
- Data updated: 2026-10-24

## What is Carry the One?

Carry the One trains the way you actually get faster at mental maths: one technique at a time, measured, and adapted to you.

QUESTIONS MADE FRESH, NEVER MEMORISED
There is no deck. Every question is generated, so the numbers change while the skill stays the same - the only way to know you have really learned it.

IT MEASURES, IT DOESN'T ASK
A short adaptive check finds your level from how you actually answer, including how long you take. No self-assessment, no picking a grade and hoping.

371 SKILLS ACROSS 12 PACKS
Whole numbers, fractions, decimals, percentages, powers and roots, algebra, measurement, probability and more - sequenced so each one rests on the last.

THE MISTAKE LAB
Carry the One names the mistake behind your errors, not just which questions you got wrong. Train a named pattern and it tracks whether the fix actually held a day and three days later.

MASTER CLASSES
A class takes a single technique - splitting instead of carrying, say - and teaches it on purpose: the method first, then guided practice, then speed.

THE BLITZ EXAM (Pro)
Every other screen adapts to you, which is why none of them can grade you. The Blitz Exam gives that up on purpose: a fixed 20-question paper across everything you have practised, scored out of 100 - and kept, so a single number becomes a trend you can watch climb.

CARRY THE ONE PRO
The Blitz Exam, the Diagnosis (the one mistake behind most of your errors, across every topic), Review Sets with a goal and an exam date, full manual mode over all 371 skills, unlimited practice, and the advanced statistics.

Free to use every day. Pro is a subscription; there is a free trial and you can cancel any time.

Terms of Use (EULA): https://economic-rugby-9a9.notion.site/Alcor-Terms-of-Use-39ebe0b6b7cb81398bacdd28ab91c5db

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Monthly | $3.99 | per month |
| Pro Yearly | $29.99 | per year |


## Is Carry the One safe?

Not enough ratings yet to assess Carry the One.

## Is Carry the One legit?

Carry the One: Mental Math has limited verification signals. The AppsHunter Legitimacy Score for Carry the One is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1 — 2026-10-14

Blitzcalc is now Carry the One. Same app, same developer, new name and icon. Your progress, streaks and subscription carry over untouched.

Also in this update:
• Smarter question selection in practice sessions
• Fixes and polish throughout

### 1.0 — 2026-09-03

No release notes.

## Apps similar to Carry the One

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Mathy — Mental Math Trainer](https://appshunter.io/ios/app/mathy-mental-math-trainer/id6779676249) | 5.0 (1) | Free | Education |
| [Math Fractions Trainer by CS](https://appshunter.io/ios/app/math-fractions-trainer-by-cs/id6752518284) | — | Free | Education |
| [Math Speed Booster: Fast Calc](https://appshunter.io/ios/app/math-speed-booster-fast-calc/id6768878089) | — | Free | Education |
| [Simple Mental Math Practice](https://appshunter.io/ios/app/simple-mental-math-practice/id6755456204) | — | Free | Education |
| [Kopfrechnen Trainer](https://appshunter.io/ios/app/kopfrechnen-trainer/id6764520128) | — | Free | Education |
| [Math Buddy: Learn & Practice](https://appshunter.io/ios/app/math-buddy-learn-and-practice/id6760890048) | — | Free | Education |

## More apps by Lars Haneveld

- [Heptavo: IB Exam Practice](https://appshunter.io/ios/app/heptavo-ib-exam-practice/id6805221111)

All apps by Lars Haneveld: https://appshunter.io/developer/6792379527

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-24.*