# Photo Extension Composition vs SlowLightMeter

The clearest difference is price: SlowLightMeter at Free against Photo Extension Composition's $1.99. SlowLightMeter also leads on rating (5.0 vs 3.5) and review sentiment (100% vs 63%). Photo Extension Composition's advantage is iOS requirement (12.0 vs 15.6). On ratings volume, ads, in-app purchases and device support there is nothing between them.

SlowLightMeter is free to download; Photo Extension Composition costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SlowLightMeter holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 13 and 6 respectively. Written reviews point the same way: 63% of Photo Extension Composition's written reviews are positive against 100% of SlowLightMeter's.

Photo Extension Composition ships an update monthly, SlowLightMeter every 5 days. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Photo Extension Composition | SlowLightMeter |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [3.5 (13 ratings)](https://appshunter.io/ios/app/photo-extension-composition/id1138153292/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/slowlightmeter/id6751812869/reviews)** |
| Number of ratings | **13** | 6 |
| Positive reviews | 62.5% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Monetization | Paid | **Free** |
| Size | 72 MB | 2 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Digiguys, Inc](https://appshunter.io/developer/888846748) | [Ari Jaaksi](https://appshunter.io/developer/1770069317) |

## What reviewers say

### Photo Extension Composition

[App page](https://appshunter.io/ios/app/photo-extension-composition/id1138153292)

This utility overlays over 10 artistic photography composition rules onto your photos. It guides you to understand and apply these rules, helping you tell a better story with your images. Save your compositions directly to your photo library.

**Highlights:** Overlays 10+ composition rules, Guides on understanding rules, Advice on rule application, Works with Apple Photos, Save compositions to library, Quick and easy to use

**In-app purchases:** none


### SlowLightMeter

[App page](https://appshunter.io/ios/app/slowlightmeter/id6751812869)

This app provides a simple and accurate light meter for film photographers. It continuously measures light with minimal interaction and includes an ISO lock to prevent accidental changes. EV values are a core feature for ease of use.

**Highlights:** Reflective and incident light metering, Continuous light measurement, ISO lock, EV value display, Simple interface

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

**In-app purchases:** none


## Frequently asked questions

### Is Photo Extension Composition free?

Photo Extension Composition costs $1.99, with no in-app purchases.

### Is SlowLightMeter free?

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

### Which has better reviews, Photo Extension Composition or SlowLightMeter?

SlowLightMeter is rated higher. Photo Extension Composition averages 3.5 out of 5 from 13 ratings, while SlowLightMeter averages 5.0 from 6 ratings.

### Do Photo Extension Composition or SlowLightMeter have ads?

Neither Photo Extension Composition nor SlowLightMeter shows ads.

### Which is updated more often, Photo Extension Composition or SlowLightMeter?

Photo Extension Composition ships an update monthly, and SlowLightMeter every 5 days. Most recently, Photo Extension Composition was updated on October 24, 2026 and SlowLightMeter 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.*