# 图纸通 vs STEP Viewer

The clearest difference is in-app purchases: STEP Viewer at none against 图纸通's 12. STEP Viewer also leads on update cadence (every 5 days vs every 2 months). 图纸通's advantage is iOS requirement (11.0 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. 图纸通 sells 12 in-app purchases, starting at $3.99 per month. STEP Viewer asks for nothing beyond the download.

图纸通 ships an update every 2 months, STEP Viewer every 5 days. The most recent releases landed on October 16, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | 图纸通 | STEP Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 87.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Freemium | — |
| Size | 50 MB | 61 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hangzhou NewDimension Systems Co., Ltd.](https://appshunter.io/developer/1058778896) | [Smart Cube Labs Co., Ltd.](https://appshunter.io/developer/1456342688) |

## What reviewers say

### 图纸通

[App page](https://appshunter.io/ios/app/cad/id1410631637)

View, share, and collaborate on 3D models and CAD drawings on your mobile device. Supports over 40 file formats and offers annotation, measurement, and project management tools for technical communication.

**Highlights:** View 40+ 3D model and CAD drawing formats, Annotate and comment on drawings, Measure dimensions, area, volume, and weight, Securely share drawings with password protection, Cloud storage and management for drawings, Project collaboration with team members, Cross-platform access (mobile, web, PC)

**Features:** macOS Compatibility

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 连续包月 | $3.99 | per month |
| 特惠包月VIP | $3.99 | per month |
| 连续包季 | $12.99 | per 3 months |
| 免费试用+包季VIP | $12.99 | per 3 months |
| 图纸通包年VIP | $29.99 | per year |
| 免费试用+包年VIP | $30.99 | per year |
| 首月特惠包年 | $39.99 | per year |
| 免费试用+包年VIP | $39.99 | per year |
| 图纸通VIP15个月 | $29.99 | one-time |
| 图纸通VIP48个月 | $49.99 | one-time |
| 终身VIP新人特惠 | $59.99 | one-time |
| 图纸通VIP终身会员 | $69.99 | one-time |


### STEP Viewer

[App page](https://appshunter.io/ios/app/step-viewer/id6756539299)

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

**In-app purchases:** none


## Frequently asked questions

### Is 图纸通 free?

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

### Is STEP Viewer free?

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

### Do 图纸通 or STEP Viewer have ads?

Neither 图纸通 nor STEP Viewer shows ads.

### Which is updated more often, 图纸通 or STEP Viewer?

图纸通 ships an update every 2 months, and STEP Viewer every 5 days. Most recently, 图纸通 was updated on October 16, 2026 and STEP Viewer on October 4, 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.*