# Castos vs Rainbow Ripples

The clearest difference is price: Castos at Free against Rainbow Ripples's $0.99. Castos also leads on iOS requirement (15.6 vs 17.6). Rainbow Ripples's advantage is update cadence (every 3 days vs every 2 months). On ads, in-app purchases and device support there is nothing between them.

Castos is free to download; Rainbow Ripples costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Castos ships an update every 2 months, Rainbow Ripples every 3 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Castos | Rainbow Ripples |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[2.8 (43 ratings)](https://appshunter.io/ios/app/castos/id1555924824/reviews)** | — |
| Number of ratings | **43** | — |
| Positive reviews | 24.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Free | — |
| Size | 50 MB | 8 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Castos](https://appshunter.io/developer/1555924826) | [Anthony Santaferra](https://appshunter.io/developer/1802374224) |

## What reviewers say

### Castos

[App page](https://appshunter.io/ios/app/castos/id1555924824)

Access all your invited private podcasts in one unified app. Stream company updates, course content, or community information without managing multiple RSS feeds. Enjoy a secure, streamlined listening experience with easy login and playback controls.

**Highlights:** Unified private podcast access, Magic Link login, Customizable playback speed, Skip forward/backward controls, View episode show notes, Streaming only (no downloads)

**Features:** Vision Pro support

**In-app purchases:** none


### Rainbow Ripples

[App page](https://appshunter.io/ios/app/rainbow-ripples/id6743347559)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Castos free?

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

### Is Rainbow Ripples free?

Rainbow Ripples costs $0.99, with no in-app purchases.

### Do Castos or Rainbow Ripples have ads?

Neither Castos nor Rainbow Ripples shows ads.

### Which is updated more often, Castos or Rainbow Ripples?

Castos ships an update every 2 months, and Rainbow Ripples every 3 days. Most recently, Castos was updated on October 24, 2026 and Rainbow Ripples 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.*