# Calibration Plus vs GroundGlass

The clearest difference is review sentiment: GroundGlass at 100% against Calibration Plus's 50%. GroundGlass also leads on price (Free vs $2.99) and update cadence (every 10 days vs every 21 months). Calibration Plus's advantage is iOS requirement (15.6 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

GroundGlass is free to download; Calibration Plus costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Calibration Plus ships an update every 21 months, GroundGlass every 10 days. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Calibration Plus | GroundGlass |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/calibration-plus/id1414916538/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 10 days** |
| Monetization | Paid | **Free** |
| Size | 14 MB | 16 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Le bord de la piscine](https://appshunter.io/developer/456593417) | [存滨 崔](https://appshunter.io/developer/1809703940) |

## What reviewers say

### Calibration Plus

[App page](https://appshunter.io/ios/app/calibration-plus/id1414916538)

This app aids in creating digital negatives for alternate process printing, offering fine tone control. It helps achieve better prints with improved dark, white, and halftone tones by designing correction curves. Generate reference charts and use image processing software to refine your digital negatives for perfect prints.

**Highlights:** Fine tone control for digital negatives, Correction curve design, Reference chart generation, Alternate process printing aid, Improved print quality

**Features:** Vision Pro support

**In-app purchases:** none


### GroundGlass

[App page](https://appshunter.io/ios/app/groundglass/id6747068863)

This app helps large format photographers meticulously log every detail of their shoots. It automatically calculates settings, supports Zone System metering, and manages film workflows. Export records, analyze trends, and access a comprehensive equipment database.

**Highlights:** Complete shooting records, Zone System metering, iCloud Sync, Film workflow management, Record templates, PDF export, Statistics & analysis

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

**In-app purchases:** none


## Frequently asked questions

### Is Calibration Plus free?

Calibration Plus costs $2.99, with no in-app purchases.

### Is GroundGlass free?

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

### Do Calibration Plus or GroundGlass have ads?

Neither Calibration Plus nor GroundGlass shows ads.

### Which is updated more often, Calibration Plus or GroundGlass?

Calibration Plus ships an update every 21 months, and GroundGlass every 10 days. Most recently, Calibration Plus was updated on October 26, 2026 and GroundGlass on October 28, 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.*