# Stackd vs Flattr

The clearest difference is update cadence: Stackd at every 4 days against Flattr's every 10 days. Stackd also leads on iOS requirement (15.1 vs 17.6). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Stackd ships an update every 4 days, Flattr every 10 days. The most recent releases landed on September 29, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Stackd | Flattr |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/flattr-exposure-blend-and-merge/id6752921647/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 10 days |
| Monetization | Free | Free |
| Size | 47 MB | 7 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Joshua Caplan](https://appshunter.io/developer/1773664677) | [Ozgur Odabasi](https://appshunter.io/developer/857719300) |

## What reviewers say

### Stackd

[App page](https://appshunter.io/ios/app/stackd-batch-image-sharing/id6736886196)

Easily share and save multiple photos with friends and family. Upload images to create a shareable stack, and recipients can swipe right to save or left to discard. Saved images are then downloaded to their device.

**Highlights:** Bulk image sharing, Swipe to save/discard, Download saved images, Create image stacks, Stacks expire after 2 days

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Stackd free?

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

### Is Flattr free?

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

### Do Stackd or Flattr have ads?

Neither Stackd nor Flattr shows ads.

### Which is updated more often, Stackd or Flattr?

Stackd ships an update every 4 days, and Flattr every 10 days. Most recently, Stackd was updated on September 29, 2026 and Flattr on October 7, 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.*