# SAJ vs Weight Log

The clearest difference is in-app purchases: SAJ at none against Weight Log's 7. SAJ also leads on iOS requirement (8.0 vs 14.0). Weight Log's advantage is update cadence (weekly vs every 23 months). On price, ads and device support there is nothing between them.

Both are free to download. Weight Log sells 7 in-app purchases, starting at $2.99 per month. SAJ asks for nothing beyond the download.

SAJ ships an update every 23 months, Weight Log weekly. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | SAJ | Weight Log |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Weekly** |
| Size | 152 MB | 126 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [SAJ Instrument Ab](https://appshunter.io/developer/962246290) | [迪 王](https://appshunter.io/developer/1598269381) |

## What reviewers say

### SAJ

[App page](https://appshunter.io/ios/app/saj-dms-calib/id962246291)

**Features:** macOS Compatibility

**In-app purchases:** none


### Weight Log

[App page](https://appshunter.io/ios/app/weight-log-track-progress/id6758137970)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 包月会员 | $2.99 | per month |
| 年度会员 | $3.99 | per year |
| Monthly Membership | $3.99 | per month |
| 季度会员 | $4.99 | per 3 months |
| Quarterly Membership | $7.99 | per 3 months |
| 年度会员 | $9.99 | per year |
| Annual Membership | $11.99 | per year |


## Frequently asked questions

### Is SAJ free?

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

### Is Weight Log free?

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

### Do SAJ or Weight Log have ads?

Neither SAJ nor Weight Log shows ads.

### Which is updated more often, SAJ or Weight Log?

SAJ ships an update every 23 months, and Weight Log weekly. Most recently, SAJ was updated on October 7, 2026 and Weight Log on October 9, 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.*