# Add One — Challenge your concentration

> Simple number game to test concentration and memory by adding one to each digit. (iPhone/iPad app by INNOVATIVE DIGITAL TECHNOLOGIES LIMITED.)

- Source: https://appshunter.io/ios/app/add-one/id1441608877 (this page in markdown: same URL + `.md`)
- Developer: [INNOVATIVE DIGITAL TECHNOLOGIES LIMITED](https://appshunter.io/developer/1331216448)
- Category: Games, Puzzle, Strategy
- Price: Free
- Rating: 3.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 23 MB
- Languages: American English
- Released: 2018-11-15
- Data updated: 2026-08-23
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/add-one/id1441608877/reviews.md

## What is Add One?

Add One is a simple game where you have to remember numbers and add one to each digit.
It is a way to test your concentration and memory in a specific time. You can keep track of your scores and see if you are improving your immediate memory and recall skills.
An example is 1095 will go to 2106.

## Key features

- Concentration testing
- Memory recall
- Score tracking
- Immediate memory improvement
- Timed challenges

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/add-one/id1441608877/reviews.md

### 3/5 — Not what I hoped

*2021-02-09*

Daniel Kahneman describes the Add-1 task in his book . I hoped to find an app which provided that challenge. First I didn't like to get served two ads, one of which took over the whole screen, for one simple round of the game. Second it stopped after one round, rather than keep going like Kahneman's Add-1 task.

## Frequently asked questions about Add One

### What is the main gameplay mechanic of Add One?

The core gameplay involves remembering a number and then adding one to each of its digits within a set time. For example, 1095 would transform into 2106.

### How does Add One help improve memory?

By requiring players to focus on digits and perform a simple calculation under time pressure, Add One aims to enhance immediate memory and recall abilities.

### Can I track my progress in Add One?

Yes, the game allows you to keep track of your scores, providing a way to monitor your improvement in concentration and memory skills over time.

### Is Add One available offline?

The provided information does not specify offline play capabilities. However, as a single-player game focused on memory, it is likely playable without an internet connection.

### What devices can I play Add One on?

Add One is supported on iPhone and iPod devices.

### What is the age rating for Add One?

Add One has an age rating of 4+, making it suitable for young players and above.

### How often is Add One updated?

The application was last updated on November 15, 2018, with version 1.0.0. There is no information on the frequency of future updates.

### Does Add One have ads?

No, Add One does not contain advertisements.

## Version history (last 1 release)

### 1.0.0 — 2018-11-15

No release notes.

## Apps similar to Add One

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Brain School 28 Training Games](https://appshunter.io/ios/app/brain-school-28-training-games/id525176256) | 4.5 (3,309) | Free | Games |
| [Bus Jam: Parking Go!](https://appshunter.io/ios/app/bus-jam-parking-go/id6738808829) | 4.7 (337) | Free | Games |
| [Mazes for kids - puzzle games](https://appshunter.io/ios/app/mazes-for-kids-puzzle-games/id1473114613) | 4.2 (260) | Free | Games |
| [Words Collide](https://appshunter.io/ios/app/words-collide/id1450105874) | 4.7 (299) | Free | Games |
| [Nonogram - IQ Logic Pic Puzzle](https://appshunter.io/ios/app/nonogram-iq-logic-pic-puzzle/id867654947) | 4.4 (9,199) | Free | Games |
| [Math game 3+2-1](https://appshunter.io/ios/app/math-game-3-plus-2-1/id1516080709) | 4.6 (5) | $4.99 | Games |

## More apps by INNOVATIVE DIGITAL TECHNOLOGIES LIMITED

- [Web Inspect for iPhone](https://appshunter.io/ios/app/web-inspect-for-iphone/id1333379507)
- [Color Jump!](https://appshunter.io/ios/app/color-jump/id1335515793)
- [iHost - HTML Live](https://appshunter.io/ios/app/ihost-html-live/id1338576676)
- [Stealth Shield - VPN Proxy](https://appshunter.io/ios/app/stealth-shield-vpn-proxy/id1358027922)
- [OpenTunnel](https://appshunter.io/ios/app/opentunnel/id1410669066)
- [iSniffer](https://appshunter.io/ios/app/isniffer/id1436431394)

All apps by INNOVATIVE DIGITAL TECHNOLOGIES LIMITED: https://appshunter.io/developer/1331216448

---

*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 2026-08-23.*