# 颠倒思维 vs Trace Binder

The clearest difference is in-app purchases: 颠倒思维 at none against Trace Binder's 3. 颠倒思维 also leads on iOS requirement (15.6 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Trace Binder sells 3 in-app purchases, starting at $0.99 per month. 颠倒思维 asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 days. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 颠倒思维 | Trace Binder |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 days | Every 2 days |
| Size | 14 MB | 46 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [睿 徐](https://appshunter.io/developer/1214823828) | [麟雅 黄](https://appshunter.io/developer/1852192369) |

## What reviewers say

### 颠倒思维

[App page](https://appshunter.io/ios/app/id1536520485)

**Features:** macOS Compatibility

**In-app purchases:** none


### Trace Binder

[App page](https://appshunter.io/ios/app/trace-binder/id6759585409)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月会员 | $0.99 | per month |
| 年会员 | $3.99 | per year |
| Lifetime Membership | $9.99 | one-time |


## Frequently asked questions

### Is 颠倒思维 free?

颠倒思维 is free to download, with no in-app purchases.

### Is Trace Binder free?

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

### Do 颠倒思维 or Trace Binder have ads?

Neither 颠倒思维 nor Trace Binder shows ads.

### Which is updated more often, 颠倒思维 or Trace Binder?

颠倒思维 ships an update every 2 days, and Trace Binder every 2 days. Most recently, 颠倒思维 was updated on October 27, 2026 and Trace Binder on October 25, 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.*