# SubSum vs 期至

The clearest difference is in-app purchases: SubSum at none against 期至's 1. 期至's advantage is update cadence (every 3 weeks vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 期至 sells 1 one-off in-app purchase. SubSum asks for nothing beyond the download.

SubSum ships an update every 4 months, 期至 every 3 weeks. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | SubSum | 期至 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Size | 2 MB | 6 MB |
| Requires iOS | 17 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [桥 汪](https://appshunter.io/developer/1658027527) | [涛 张](https://appshunter.io/developer/6805718141) |

## What reviewers say

### SubSum

[App page](https://appshunter.io/ios/app/subsum/id6754885566)

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

**In-app purchases:** none


### 期至

[App page](https://appshunter.io/ios/app/id6809010768)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 期至买断 | $4.99 | one-time |


## Frequently asked questions

### Is SubSum free?

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

### Is 期至 free?

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

### Do SubSum or 期至 have ads?

Neither SubSum nor 期至 shows ads.

### Which is updated more often, SubSum or 期至?

SubSum ships an update every 4 months, and 期至 every 3 weeks. Most recently, SubSum was updated on October 12, 2026 and 期至 on October 13, 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.*