# PicDiff vs Optris calculator

The clearest difference is in-app purchases: Optris calculator at none against PicDiff's 1. Optris calculator also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. PicDiff sells 1 one-off in-app purchase. Optris calculator asks for nothing beyond the download.

PicDiff ships an update monthly, Optris calculator every 2 months. The most recent releases landed on October 11, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | PicDiff | Optris calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/picdiff/id1266238855/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 23 MB | 31 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aceca Corp.](https://appshunter.io/developer/983165401) | [Optris GmbH](https://appshunter.io/developer/1619077973) |

## What reviewers say

### PicDiff

[App page](https://appshunter.io/ios/app/picdiff/id1266238855)

Compare photos with precision by overlaying two images. Analyze subtle differences down to the pixel with an intuitive and user-friendly interface, perfect for professionals and enthusiasts alike.

**Highlights:** Overlay comparisons, Pixel-level precision, User-friendly interface, In-depth photo analysis, Subtle variation detection

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade | $17.99 | one-time |


### Optris calculator

[App page](https://appshunter.io/ios/app/optris-calculator/id1619077971)

**In-app purchases:** none


## Frequently asked questions

### Is PicDiff free?

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

### Is Optris calculator free?

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

### Do PicDiff or Optris calculator have ads?

PicDiff shows ads; Optris calculator does not.

### Which is updated more often, PicDiff or Optris calculator?

PicDiff ships an update monthly, and Optris calculator every 2 months. Most recently, PicDiff was updated on October 11, 2026 and Optris calculator on September 20, 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.*