# SubSum vs LittleThing

The clearest difference is in-app purchases: SubSum at none against LittleThing's 3. SubSum also leads on iOS requirement (17 vs 26.0). LittleThing's advantage is update cadence (every 3 weeks vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. LittleThing sells 3 in-app purchases, starting at $0.99 per month. SubSum asks for nothing beyond the download.

SubSum ships an update every 4 months, LittleThing every 3 weeks. The most recent releases landed on October 12, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | SubSum | LittleThing |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/littlething/id6759630656/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 58 MB |
| Requires iOS | **17** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [桥 汪](https://appshunter.io/developer/1658027527) | [青 刘](https://appshunter.io/developer/1879790002) |

## What reviewers say

### SubSum

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

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

**In-app purchases:** none


### LittleThing

[App page](https://appshunter.io/ios/app/littlething/id6759630656)

This app helps you track and manage important life events like birthdays and anniversaries. It offers smart countdowns, full lunar calendar support, and customizable reminders to ensure no significant moment is forgotten. Organize your events with tags and view them easily with elegant widgets.

**Highlights:** Smart countdowns and forward counts, Full lunar calendar support, Flexible recurring events, Powerful reminder system, Tag-based categorization, Beautiful home screen widgets, Historical event review

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Yearly | $2.99 | per year |
| Lifetime | $4.99 | one-time |


## Frequently asked questions

### Is SubSum free?

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

### Is LittleThing free?

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

### Do SubSum or LittleThing have ads?

Neither SubSum nor LittleThing shows ads.

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

SubSum ships an update every 4 months, and LittleThing every 3 weeks. Most recently, SubSum was updated on October 12, 2026 and LittleThing on October 5, 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.*