# CalcuLight vs REDLIGHT

The clearest difference is update cadence: REDLIGHT at every 3 days against CalcuLight's monthly. REDLIGHT also leads on iOS requirement (13.0 vs 15.1). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. CalcuLight sells 2 in-app purchases, starting at $0.99 per month and REDLIGHT sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for CalcuLight against 5.0 for REDLIGHT. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

CalcuLight ships an update monthly, REDLIGHT every 3 days. The most recent releases landed on October 31, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | CalcuLight | REDLIGHT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/calculight/id6758964459/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/redlight-photo-editor/id6760779303/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 40 MB | 32 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Li Fan](https://appshunter.io/developer/1876047115) | [The Red Collar Company](https://appshunter.io/developer/1594428043) |

## What reviewers say

### CalcuLight

[App page](https://appshunter.io/ios/app/calculight/id6758964459)

This app provides advanced light metering for film photographers, offering multiple metering modes and exposure control options. It helps users achieve precise exposures for their shots, with features like Zone System display and a log book for tracking. A free version is available, with an optional Pro upgrade for more advanced tools.

**Highlights:** Center Weighted metering, 3D Matrix metering, Spot metering (Pro), Calculated metering (Pro), Shutter Priority metering, Aperture Priority metering (Pro), Zone System overlay (Pro), Log book with GPS (Pro)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CalcuLight | $0.99 | per month |
| CalcuLight | $14.99 | one-time |


### REDLIGHT

[App page](https://appshunter.io/ios/app/redlight-photo-editor/id6760779303)

This app uses AI to interpret your text descriptions and create unique photo edits, going beyond simple filters. It offers intelligent corrections, scene reimagining, and photo merging, alongside a comprehensive set of manual editing tools and effects.

**Highlights:** AI-powered editing based on text prompts, Intelligent image enhancement and correction, Customizable look and scene transformations, Photo merging and compositing, Extensive library of filters and textures, GPU-accelerated visual effects, Cloud sync for custom presets

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| REDLIGHT AI - Monthly | $9.99 | per month |
| REDLIGHT AI - Yearly | $99.99 | per year |


## Frequently asked questions

### Is CalcuLight free?

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

### Is REDLIGHT free?

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

### Which has better reviews, CalcuLight or REDLIGHT?

CalcuLight and REDLIGHT are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do CalcuLight or REDLIGHT have ads?

Neither CalcuLight nor REDLIGHT shows ads.

### Which is updated more often, CalcuLight or REDLIGHT?

CalcuLight ships an update monthly, and REDLIGHT every 3 days. Most recently, CalcuLight was updated on October 31, 2026 and REDLIGHT on November 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.*