# SubSum vs 闹钟实验室

The clearest difference is in-app purchases: SubSum at none against 闹钟实验室's 2. SubSum also leads on iOS requirement (17 vs 26.0). 闹钟实验室's advantage is update cadence (every 9 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. 闹钟实验室 sells 2 one-off in-app purchases. SubSum asks for nothing beyond the download.

SubSum ships an update every 4 months, 闹钟实验室 every 9 days. The most recent releases landed on October 12, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | SubSum | 闹钟实验室 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (10 ratings)](https://appshunter.io/ios/app/id6756372553/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 9 days** |
| Monetization | — | Freemium |
| Size | 2 MB | 33 MB |
| Requires iOS | **17** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [桥 汪](https://appshunter.io/developer/1658027527) | [鑫 高](https://appshunter.io/developer/1785384243) |

## What reviewers say

### SubSum

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

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

**In-app purchases:** none


### 闹钟实验室

[App page](https://appshunter.io/ios/app/id6756372553)

This app enhances iOS's native alarm functionality with advanced scheduling options. It offers flexible repeat patterns, holiday integration, and custom date settings for precise reminders. Manage alarms efficiently with group organization and custom班次 (shifts).

**Highlights:** System-level alarms with native experience, Advanced repeat patterns (workdays, rest days, shifts), Chinese statutory holiday integration, Single alarm with specific date setting, Customizable ringtones and sleep sounds, Shift calendar with custom班次 and alarm creation, Alarm group management for a cleaner list

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 个人版 | $1.19 | one-time |
| 家庭版 | $2.59 | one-time |


## Frequently asked questions

### Is SubSum free?

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

### Is 闹钟实验室 free?

闹钟实验室 is free to download, with in-app purchases available.

### Do SubSum or 闹钟实验室 have ads?

Neither SubSum nor 闹钟实验室 shows ads.

### Which is updated more often, SubSum or 闹钟实验室?

SubSum ships an update every 4 months, and 闹钟实验室 every 9 days. Most recently, SubSum was updated on October 12, 2026 and 闹钟实验室 on October 30, 2026.

---

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