# James Owl Calc vs 专业相机 Pro

The clearest difference is in-app purchases: James Owl Calc at none against 专业相机 Pro's 3. James Owl Calc also leads on iOS requirement (16.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. 专业相机 Pro sells 3 in-app purchases, starting at $3.99 per 7 days. James Owl Calc asks for nothing beyond the download.

## The numbers

| Metric | James Owl Calc | 专业相机 Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/james-owl-calc/id6667115988/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | — |
| Monetization | Free | — |
| Size | 32 MB | 25 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [James Zhen Yu](https://appshunter.io/developer/1723033163) | [文龙 徐](https://appshunter.io/developer/1559501816) |

## What reviewers say

### James Owl Calc

[App page](https://appshunter.io/ios/app/james-owl-calc/id6667115988)

This tool helps landscape photographers calculate precise camera settings for long exposure shots. It recommends ND filter combinations, aperture, and ISO based on your current settings and desired effect. Features include tutorials and camera-specific adjustments.

**Highlights:** Precise exposure calculations for ND filters, Reverse calculation mode, Smart adaptive technology for light changes, Built-in countdown timer with audio alerts, Camera-specific settings, Long exposure technique tutorials

**Features:** macOS Compatibility

**In-app purchases:** none


### 专业相机 Pro

[App page](https://appshunter.io/ios/app/pro/id6761525701)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 连续包周 | $3.99 | per 7 days |
| 连续包月 | $5.99 | per month |
| 连续包年 | $14.99 | per year |


## Frequently asked questions

### Is James Owl Calc free?

James Owl Calc is free to download, with no in-app purchases.

### Is 专业相机 Pro free?

专业相机 Pro is free to download, with in-app purchases available.

### Do James Owl Calc or 专业相机 Pro have ads?

Neither James Owl Calc nor 专业相机 Pro shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*