# JPKI利用者ソフト vs Brain training calculator

The clearest difference is ads: JPKI利用者ソフト at none against Brain training calculator's shown. Brain training calculator's advantage is update cadence (every 2 weeks vs every 6 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

JPKI利用者ソフト ships an update every 6 months, Brain training calculator every 2 weeks. Both last shipped on October 20, 2026.

## The numbers

| Metric | JPKI利用者ソフト | Brain training calculator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 10.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 7 MB | 35 MB |
| Requires iOS | **14.0** | 15.8.3 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Japan Agency for Local Authority Information Systems](https://appshunter.io/developer/1481154804) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### JPKI利用者ソフト

[App page](https://appshunter.io/ios/app/jpki/id1481154805)

This app allows users to view and verify the validity of digital certificates on their My Number Card using an iPhone. It also provides functionality to change passwords and receive notifications for certificate expiration.

**Highlights:** View digital certificate details, Verify certificate validity, Change passwords, Receive expiration notifications, Check certificate expiration dates

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Brain training calculator

[App page](https://appshunter.io/ios/app/brain-training-calculator/id6502152942)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is JPKI利用者ソフト free?

JPKI利用者ソフト is free to download, with no in-app purchases.

### Is Brain training calculator free?

Brain training calculator is free to download, with no in-app purchases.

### Do JPKI利用者ソフト or Brain training calculator have ads?

Brain training calculator shows ads; JPKI利用者ソフト does not.

### Which is updated more often, JPKI利用者ソフト or Brain training calculator?

JPKI利用者ソフト ships an update every 6 months, and Brain training calculator every 2 weeks. Most recently, JPKI利用者ソフト was updated on October 20, 2026 and Brain training calculator on October 20, 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.*