# SDM Agent vs CheX（チェクロス）

The clearest difference is in-app purchases: SDM Agent at none against CheX（チェクロス）'s 1. SDM Agent also leads on iOS requirement (10.0 vs 17.0). CheX（チェクロス）'s advantage is update cadence (every 10 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. CheX（チェクロス） sells 1 one-off in-app purchase. SDM Agent asks for nothing beyond the download.

SDM Agent ships an update every 4 months, CheX（チェクロス） every 10 days. The most recent releases landed on May 17, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | SDM Agent | CheX（チェクロス） |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 20.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 10 days** |
| Monetization | — | Free |
| Size | 10 MB | 69 MB |
| Requires iOS | **10.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ISB Corporation](https://appshunter.io/developer/318273730) | [YSL Solution Co., Ltd.](https://appshunter.io/developer/404131444) |

## What reviewers say

### SDM Agent

[App page](https://appshunter.io/ios/app/sdm-agent/id739028997)

**In-app purchases:** none


### CheX（チェクロス）

[App page](https://appshunter.io/ios/app/chex/id1289611667)

This app allows users to quickly view construction documents, add handwritten notes and photos directly onto blueprints, and share this information with others. It helps organize and update field information efficiently, preventing errors from outdated plans.

**Highlights:** High-speed blueprint viewing, Annotate with handwritten notes, Attach photos to documents, Cross-platform sharing (Windows/Mac), User permission controls, Organize large document sets

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month (30 days) | $28.99 | one-time |


## Frequently asked questions

### Is SDM Agent free?

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

### Is CheX（チェクロス） free?

CheX（チェクロス） is free to download, with in-app purchases available.

### Do SDM Agent or CheX（チェクロス） have ads?

Neither SDM Agent nor CheX（チェクロス） shows ads.

### Which is updated more often, SDM Agent or CheX（チェクロス）?

SDM Agent ships an update every 4 months, and CheX（チェクロス） every 10 days. Most recently, SDM Agent was updated on May 17, 2026 and CheX（チェクロス） on September 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.*