# Flux vs Casterly

The clearest difference is price: Casterly at Free against Flux's $3.99. Casterly also leads on iOS requirement (17.6 vs 26.0). Flux's advantage is in-app purchases (none vs 1) and update cadence (every 3 days vs weekly). On ads and device support there is nothing between them.

Casterly is free to download; Flux costs $3.99 up front. Casterly sells 1 in-app purchase, starting at $9.99 per year. Flux asks for nothing beyond the download.

Flux ships an update every 3 days, Casterly weekly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Flux | Casterly |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | Paid | — |
| Best chart rank | **#119** | — |
| Size | 19 MB | 15 MB |
| Requires iOS | 26.0 | **17.6** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Apple Watch |
| Age rating | 17+ | 12+ |
| Developer | [Adrien DONOT](https://appshunter.io/developer/494531402) | [Sodium Studio, LLC](https://appshunter.io/developer/1887896668) |

## What reviewers say

### Flux

[App page](https://appshunter.io/ios/app/flux-smart-rss-reader/id6752223666)

**Currently charting:** #119 Top Paid · News (US App Store)

Consolidate your RSS and Atom feeds into a streamlined reading experience across Apple devices. Organize articles, discover content through images, and enjoy immersive reading modes. Listen to articles with text-to-speech and utilize AI summarization.

**Highlights:** Consolidates RSS and Atom feeds, Organize articles into folders, Browse stories with Feed Wall (images), Full-screen immersive reading mode, Text-to-speech article playback, AI article summarization (Apple Intelligence), iCloud library sync across devices

**Features:** Vision Pro support

**In-app purchases:** none


### Casterly

[App page](https://appshunter.io/ios/app/casterly/id6761127451)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Casterly Pro | $9.99 | per year |


## Frequently asked questions

### Is Flux free?

Flux costs $3.99, with no in-app purchases.

### Is Casterly free?

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

### Do Flux or Casterly have ads?

Neither Flux nor Casterly shows ads.

### Which is updated more often, Flux or Casterly?

Flux ships an update every 3 days, and Casterly weekly. Most recently, Flux was updated on October 30, 2026 and Casterly on October 31, 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.*