# Stack｜自己投資アプリ vs KPass

The clearest difference is in-app purchases: Stack｜自己投資アプリ at none against KPass's 10. KPass's advantage is update cadence (every 4 days vs every 10 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. KPass sells 10 in-app purchases, starting at $0.99 per month. Stack｜自己投資アプリ asks for nothing beyond the download.

Stack｜自己投資アプリ ships an update every 10 days, KPass every 4 days. The most recent releases landed on October 14, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Stack｜自己投資アプリ | KPass |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 4 days** |
| Monetization | — | Free |
| Size | 41 MB | 127 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Nagato Kadoya](https://appshunter.io/developer/1575311338) | [YUYA ITONAGA](https://appshunter.io/developer/1823050360) |

## What reviewers say

### Stack｜自己投資アプリ

[App page](https://appshunter.io/ios/app/stack/id6745755185)

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

**In-app purchases:** none


### KPass

[App page](https://appshunter.io/ios/app/kpass-timetable-for-keio/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:** 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 Stack｜自己投資アプリ free?

Stack｜自己投資アプリ is free to download, with no in-app purchases.

### Is KPass free?

KPass is free to download, with in-app purchases available.

### Do Stack｜自己投資アプリ or KPass have ads?

Neither Stack｜自己投資アプリ nor KPass shows ads.

### Which is updated more often, Stack｜自己投資アプリ or KPass?

Stack｜自己投資アプリ ships an update every 10 days, and KPass every 4 days. Most recently, Stack｜自己投資アプリ was updated on October 14, 2026 and KPass on October 19, 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.*