# 低空亿 vs Left

The clearest difference is price: 低空亿 at Free against Left's $0.99. 低空亿 also leads on iOS requirement (15.6 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

低空亿 is free to download; Left costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | 低空亿 | Left |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | — |
| Monetization | — | Paid |
| Size | 137 MB | 9 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [河北中启之芯科技有限公司](https://appshunter.io/developer/1833453617) | [永鹏 裴](https://appshunter.io/developer/1858588328) |

## What reviewers say

### 低空亿

[App page](https://appshunter.io/ios/app/id6748329049)

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

**In-app purchases:** none


### Left

[App page](https://appshunter.io/ios/app/left-life-progress/id6756245784)

Visualize your entire life's timeline on a single grid, from past to future. Make choices each week to turn wasted time into legendary memories. No ads, social validation, or subscriptions, just your personal reflection.

**Highlights:** Single-screen life timeline, Zoomable timeline view, Weekly progress judgment (Iron/Gold), No ads or social distractions, Focus on personal reflection

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

**In-app purchases:** none


## Frequently asked questions

### Is 低空亿 free?

低空亿 is free to download, with no in-app purchases.

### Is Left free?

Left costs $0.99, with no in-app purchases.

### Do 低空亿 or Left have ads?

Neither 低空亿 nor Left shows ads.

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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.*