# Retrace vs 同频sync

Retrace and 同频sync are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Retrace sells 4 in-app purchases, starting at $5.99 per month and 同频sync sells 6 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Retrace ships an update every 2 days, 同频sync every 3 days. The most recent releases landed on November 8, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Retrace | 同频sync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/retrace-life-diary-and-tracker/id6481981341/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 days |
| Monetization | Freemium | — |
| Size | 79 MB | 30 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [美群 唐](https://appshunter.io/developer/1628513026) | [磊 董](https://appshunter.io/developer/6808440096) |

## What reviewers say

### Retrace

[App page](https://appshunter.io/ios/app/retrace-life-diary-and-tracker/id6481981341)

This app automatically tracks your daily activities and location to create a personal history. It offers smart analysis of your past, integrates with health data, and provides reports on time allocation. Designed with privacy in mind, it requires no sign-in.

**Highlights:** Automatic activity tracking, Smart life analysis, Health integration (Apple Health), Comprehensive time allocation reports, Privacy-focused design, No sign-in required

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $5.99 | per month |
| Yearly | $29.99 | per year |
| Yearly (Standard) | $59.99 | per year |
| Lifetime membership | $129.99 | one-time |


### 同频sync

[App page](https://appshunter.io/ios/app/sync/id6808456087)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 同频pro月度会员 | $1.99 | per month |
| 同频 Pro年度会员 | $19.99 | per year |
| 同频 Pro 固定期限会员（1年） | $9.99 | one-time |
| 同频 Pro 固定期限会员（2年） | $22.99 | one-time |
| 同频 Pro 固定期限会员（3年） | $29.99 | one-time |
| 同频sync终身会员 | $39.99 | one-time |


## Frequently asked questions

### Is Retrace free?

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

### Is 同频sync free?

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

### Do Retrace or 同频sync have ads?

Neither Retrace nor 同频sync shows ads.

### Which is updated more often, Retrace or 同频sync?

Retrace ships an update every 2 days, and 同频sync every 3 days. Most recently, Retrace was updated on November 8, 2026 and 同频sync on October 29, 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.*