# Missing Number Calculator vs KPass(ケーパス)

The clearest difference is price: KPass(ケーパス) at Free against Missing Number Calculator's $0.99. Missing Number Calculator's advantage is in-app purchases (none vs 10). On update cadence, ads, device support and iOS requirement there is nothing between them.

KPass(ケーパス) is free to download; Missing Number Calculator costs $0.99 up front. KPass(ケーパス) sells 10 in-app purchases, starting at $0.99 per month. Missing Number Calculator asks for nothing beyond the download.

Missing Number Calculator ships an update every 3 days, KPass(ケーパス) weekly. The most recent releases landed on September 27, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Missing Number Calculator | KPass(ケーパス) |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | — | 65.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | — | Free |
| Size | 6 MB | 137 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Infinity Inc. (Apps)](https://appshunter.io/developer/1680741877) | [YUYA ITONAGA](https://appshunter.io/developer/1823050360) |

## What reviewers say

### Missing Number Calculator

[App page](https://appshunter.io/ios/app/missing-number-calculator/id6747973776)

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

**In-app purchases:** none


### KPass(ケーパス)

[App page](https://appshunter.io/ios/app/kpass/id6754703817)

This app streamlines university life by integrating class schedules, assignments, and communication into one platform. It offers features like automatic schedule generation, deadline reminders, and attendance tracking to support busy students.

**Highlights:** Integrated class schedule with direct access to course pages, Unified assignment list with deadline grouping and reminders, Attendance tracking and management, Calendar and personal schedule integration, In-app communication and grade management, Social features for student interaction, Convenience tools like room finder and bus schedules

**Features:** macOS Compatibility, Safari Extension

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| KPass Plus (月額) | $0.99 | per month |
| KPass AI 使い放題 | $1.99 | per month |
| KPass Pro (月額) | $2.99 | per month |
| KPass AI 10パック | $0.49 | one-time |
| 開発者にお菓子をあげる | $0.49 | one-time |
| KPass AI 30パック | $1.99 | one-time |
| 開発者にコーヒーをあげる | $1.99 | one-time |
| 開発者にピザをあげる | $2.99 | one-time |
| KPass AI 100パック | $3.99 | one-time |
| KPass Plus（買い切り） | $5.99 | one-time |


## Frequently asked questions

### Is Missing Number Calculator free?

Missing Number Calculator costs $0.99, with no in-app purchases.

### Is KPass(ケーパス) free?

KPass(ケーパス) is free to download, with in-app purchases available.

### Do Missing Number Calculator or KPass(ケーパス) have ads?

Neither Missing Number Calculator nor KPass(ケーパス) shows ads.

### Which is updated more often, Missing Number Calculator or KPass(ケーパス)?

Missing Number Calculator ships an update every 3 days, and KPass(ケーパス) weekly. Most recently, Missing Number Calculator was updated on September 27, 2026 and KPass(ケーパス) on September 29, 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.*