# Flattr vs Celvion Stack

The clearest difference is price: Flattr at Free against Celvion Stack's $9.90. Celvion Stack's advantage is chart position (#185 vs unranked). On update cadence, ads, in-app purchases and device support there is nothing between them.

Flattr is free to download; Celvion Stack costs $9.90 up front. Neither carries in-app purchases, so what you see is what you pay.

Flattr ships an update every 10 days, Celvion Stack every 2 weeks. Both last shipped on October 25, 2026.

## The numbers

| Metric | Flattr | Celvion Stack |
| --- | --- | --- |
| Price | **Free** | $9.90 |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/flattr-exposure-blend-and-merge/id6752921647/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 2 weeks |
| Monetization | Free | — |
| Best chart rank | — | **#185** |
| Size | 7 MB | 324 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ozgur Odabasi](https://appshunter.io/developer/857719300) | [新庾 郭](https://appshunter.io/developer/6786308122) |

## What reviewers say

### Flattr

[App page](https://appshunter.io/ios/app/flattr-exposure-blend-and-merge/id6752921647)

Create perfectly balanced photos by merging multiple exposures using advanced GPU exposure fusion. This app allows photographers to stack, overlay, and combine bracketed shots for natural-looking results without filters or subscriptions. Export in TIFF or JPEG formats.

**Highlights:** Real exposure fusion, not filters, Supports RAW (.DNG) and JPEG inputs, TIFF and JPEG export, GPU-accelerated processing, Auto image alignment, Photo stacking and blending, Double exposure and overlay effects

**In-app purchases:** none


### Celvion Stack

[App page](https://appshunter.io/ios/app/celvion-stack/id6790672094)

**Currently charting:** #185 Top Paid · Photo & Video (US App Store)

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

**In-app purchases:** none


## Frequently asked questions

### Is Flattr free?

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

### Is Celvion Stack free?

Celvion Stack costs $9.90, with no in-app purchases.

### Do Flattr or Celvion Stack have ads?

Neither Flattr nor Celvion Stack shows ads.

### Which is updated more often, Flattr or Celvion Stack?

Flattr ships an update every 10 days, and Celvion Stack every 2 weeks. Most recently, Flattr was updated on October 25, 2026 and Celvion Stack on October 25, 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.*