# JM vs Calc+α

The clearest difference is ads: JM at none against Calc+α's shown. JM also leads on device support (3 vs 1) and iOS requirement (13.0 vs 16.4). On price, update cadence and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

JM ships an update monthly, Calc+α every 3 weeks. Both last shipped on October 3, 2026.

## The numbers

| Metric | JM | Calc+α |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | — | Ad-supported |
| Size | 18 MB | 9 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Japan Radio Co.,Ltd.](https://appshunter.io/developer/932220259) | [Ariane Inc.](https://appshunter.io/developer/449595295) |

## What reviewers say

### JM

[App page](https://appshunter.io/ios/app/jm-watcher/id932220260)

**In-app purchases:** none


### Calc+α

[App page](https://appshunter.io/ios/app/calc-plus/id1454376672)

This utility app simplifies daily calculations with an intuitive interface. It features a history of your calculations, allows for easy editing and recalculation, and provides convenient tax and division functions. Organize your finances and avoid manual note-taking.

**Highlights:** Calculation history and review, Edit past calculations and recalculate, Tax-inclusive and exclusive calculation modes, Standard and reduced tax rate switching, Clear division and remainder display, Create and copy calculation sheets

**In-app purchases:** none


## Frequently asked questions

### Is JM free?

JM is free to download, with no in-app purchases.

### Is Calc+α free?

Calc+α is free to download, with no in-app purchases.

### Do JM or Calc+α have ads?

Calc+α shows ads; JM does not.

### Which is updated more often, JM or Calc+α?

JM ships an update monthly, and Calc+α every 3 weeks. Most recently, JM was updated on October 3, 2026 and Calc+α on October 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*