# picocalc — Simple Number Memo

> Minimalist number memo app with home screen badge display. (iPhone/iPad app by Masayuki Akamatsu.)

- Source: https://appshunter.io/ios/app/picocalc/id284740333 (this page in markdown: same URL + `.md`)
- Developer: [Masayuki Akamatsu](https://appshunter.io/developer/284722836)
- Category: Productivity, Lifestyle
- Price: Free with in-app purchases
- Rating: 5.00/5 from 3 App Store ratings · 32 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 6 MB
- Languages: American English, Japanese
- Released: 2019-02-12
- Data updated: 2026-08-31
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/picocalc/id284740333/reviews.md

## What is picocalc?

picocalc is a tiny number memo which can be set, added and subtracted. The number is show as an application badge in the home screen. Zero and a negative number won't be shown in the badge.

## Key features

- Set a number
- Add to number
- Subtract from number
- Home screen badge display
- Hides zero and negative numbers

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Recent user reviews (10 of 32)

All indexed reviews: https://appshunter.io/ios/app/picocalc/id284740333/reviews.md

### 2/5 — Broken

*2024-02-20*

This little app used to be brilliant, now it is broken and I can’t seem to find any instructions about the problem, or how to fix it. There’s now a message appears on the home screen, saying ‘Please grant permission to display badge’. I have gone into settings and made sure the permissions are correct to display a badge, but still the message remains. Also, pressing the + or - key does nothing. Is there a fix for this?

### 5/5 — A Classic

*2024-02-11*

So happy to see that this app is here! Picocalc is of the first apps I ever downloaded—way back on the 1st gen iPod Touch running system software 2. Right now things feel unexplored and exciting like 2008 again!

### 5/5 — Simple, No Other Counter App with Badge Out There

*2018-10-01*

Been using this app for 10 years. I may change phones but I always keep this app on my first or second screen. It’s simple: just set a number and then use the calculator to add or subtract from that starting number, and the result posts as a little red badge in the home screen app icon.

I tend to use this as a quick budget calculator. I set it to my monthly budget for food and expenses, and it gives me a quick-glance preview of the number by just looking at the badge. I can quickly see how much of my budget I have left to spend on without even opening the app.

One thing I wish this was capable of is sharing with another user, real-time. If my partner installed picocalc and it could update every time I added or subtracted, then we could both keep an eye on the same number separately. Likewise, it would be useful if the other person could subtract a number when they spend on lunch, and my picocalc showed an updated number.

I’ve tried finding any other app that does something similar, but this is the only app that seems to exist of its type. Kudos to the developer! I hope you keep updating and maybe even scale it up just a little bit more :)

### 5/5 — Rules, owns, etc

*2015-05-25*

I was waiting for an update to make it compatible and now that it's here, blows my mind. It's crazy how lost you are when you lose such a simple app, but thank Buddha we got you back.

### 4/5 — Seems to have gone buggy with iOS 8.

*2015-01-16*

Such a shame. I have use this app daily for over five years, and have found no substitute. Sure, there are all sorts of checkbook and let your balancing apps out there, but none that allow me to get in, adjust my balance, and get out all in the seconds as I leave the cash register. Well I have virtually no features, it won the speed war. 

But now, with ios 8 it no longer seems to do it's math correctly.

### 5/5 — いいです

*2013-03-28*

かなり面白いアプリケーションです。
SS撮影時のカモフラージュに使わせていただいてます。

勘違いされてる方がいるようですが、設定は指定した数値をそのまま"設定"するということです。
また、落ちるのは仕様だと思われます。

### 4/5 — 落ちる？

*2011-08-02*

設定、加算、減算 どれを押しても落ちます(;･∀･) でもバッジには正しい数字が反映されてるので そうゆう物なのかしら？そこが謎なだけで、便利に使わせて頂いています♪ 私も このアプリ２つ欲しいです！  インフォメーションに書かれてる有償バージョンも期待しています☆

### 5/5 — Love it!

*2011-03-09, version 0*

Use it every day. Very fast. Nuff said.

### 4/5 — Works perfect

*2010-06-09*

Works great to track my monthly gas allowance from my job. I just enter the allottment on the 1st and subtract the amount each time I fill up. Would be better if you could track more than one category and decide which one is on your desktop though.

### 5/5 — いい。

*2010-05-12*

一週間分の立て替え金額をぱぱっとメモっておくのがかなり楽になりました。
同じアプリが複数欲しいです。
１つは立て替え用に。
もう１つは外出時に使った金額の即メモ（あとで違うアプリで家計簿をつけるため）
色を変えただけでもいいので…とかできないのかなぁ。。

## Frequently asked questions about picocalc

### What is picocalc used for?

picocalc is a simple number memo application. It allows you to set, add to, and subtract from a single number, which is then displayed as an application badge on your home screen.

### What devices does picocalc support?

picocalc is available on Apple Watch, iPhone, iPad, and Apple Vision Pro (realityDevice).

### How often is picocalc updated?

The latest version, 3.1.0, was released on February 21, 2024. The app was originally released on February 12, 2019, indicating regular updates.

### What is the age rating for picocalc?

picocalc has an age rating of 4+, making it suitable for a wide range of users.

### Does picocalc show negative numbers or zero on the badge?

No, picocalc is designed to not show zero or negative numbers on the home screen badge. Only positive numbers will be displayed.

### What is the user feedback on picocalc?

picocalc has received excellent user feedback, with an average rating of 5.0 stars from 3 ratings.

### Can picocalc integrate with other productivity apps?

The provided information does not specify integrations with other productivity apps. Its primary function is a standalone home screen badge display.

### Is there a paid version or subscription for picocalc?

No, picocalc is completely free to download and use, with no in-app purchases or advertisements mentioned.

## Version history (last 5 releases)

### 3.2.0 — 2026-08-26

- Redesigned the number pad so the whole screen stays visible, with a settings button in its lower-left corner.
- Apple Watch: added + and - buttons, and the number now syncs both ways with iPhone and is kept between launches.
- Fixed a crash when pasting text or entering very large numbers.
- Added an option to remove the banner ad.
- Updated for the latest iOS and watchOS.

### 3.1.0 — 2024-02-21

- Add Dark Mode
- Add Increase/Decrease/Reset functions

### 3.0.0 — 2024-01-29

User Interface improved.

### 2.1.0 — 2015-06-09

This app has been updated by Apple to display the Apple Watch app icon.

- User interface updated

### 2.0.0 — 2015-04-28

- Supports iOS 8
- Supports Apple Watch
- Add a counter function

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## More apps by Masayuki Akamatsu

- [Yes\|No Free](https://appshunter.io/ios/app/yesno-free/id284722833)
- [Alarm Free](https://appshunter.io/ios/app/alarm-free/id284728433)
- [Compass Free](https://appshunter.io/ios/app/compass-free/id284735786)
- [Gengou Lib](https://appshunter.io/ios/app/gengou-lib/id284830543)
- [T4Two](https://appshunter.io/ios/app/t4two/id284910005)

All apps by Masayuki Akamatsu: https://appshunter.io/developer/284722836

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*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 2026-08-31.*