# Rainbow Secrets vs Otter Smash Shello

The clearest difference is rating: Rainbow Secrets at 5.0 against Otter Smash Shello's 3.0. Rainbow Secrets also leads on ads (none vs shown) and iOS requirement (9.0 vs 15.0). Otter Smash Shello's advantage is in-app purchases (none vs 4). On price, ratings volume, update cadence and device support there is nothing between them.

Both are free to download. Rainbow Secrets sells 4 one-off in-app purchases. Otter Smash Shello asks for nothing beyond the download.

Rainbow Secrets holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Rainbow Secrets ships an update every 2 weeks, Otter Smash Shello every 8 days. The most recent releases landed on October 29, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Rainbow Secrets | Otter Smash Shello |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rainbow-secrets/id1063358876/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/otter-smash-shello/id6794254203/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 8 days** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 56 MB | 184 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 17+ |
| Developer | [NextStack LLC](https://appshunter.io/developer/1063341649) | [欣怡 刘](https://appshunter.io/developer/1864792068) |

## What reviewers say

### Rainbow Secrets

[App page](https://appshunter.io/ios/app/rainbow-secrets/id1063358876)

Explore vibrant worlds inspired by nature in this colorful puzzle game. Match color combinations across four unique themes: Flowers, Sea, Forest, and Rainbow. With 100 handcrafted levels, it offers a relaxing yet challenging experience.

**Highlights:** Nature-inspired themes (Flowers, Sea, Forest, Rainbow), 100 handcrafted levels, Color matching puzzles, Relaxing music, Free undo options

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 25 Unods | $0.99 | one-time |
| 100 Undos | $2.99 | one-time |
| 200 Undos | $4.99 | one-time |
| Skip button | $4.99 | one-time |


### Otter Smash Shello

[App page](https://appshunter.io/ios/app/otter-smash-shello/id6794254203)

Engage in a relaxing tapping game where you help an otter smash shells. Enjoy satisfying impacts, smooth animations, and a calming rhythm designed to ease stress and brighten your day with simple, cheerful gameplay.

**Highlights:** Tap to smash shells, Playful otter character, Stress-relieving gameplay, Smooth visual animations, Easy one-touch controls, Seaside adventure setting

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

**In-app purchases:** none


## Frequently asked questions

### Is Rainbow Secrets free?

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

### Is Otter Smash Shello free?

Otter Smash Shello is free to download, with no in-app purchases.

### Which has better reviews, Rainbow Secrets or Otter Smash Shello?

Rainbow Secrets is rated higher. Rainbow Secrets averages 5.0 out of 5 from 1 ratings, while Otter Smash Shello averages 3.0 from 2 ratings.

### Do Rainbow Secrets or Otter Smash Shello have ads?

Otter Smash Shello shows ads; Rainbow Secrets does not.

### Which is updated more often, Rainbow Secrets or Otter Smash Shello?

Rainbow Secrets ships an update every 2 weeks, and Otter Smash Shello every 8 days. Most recently, Rainbow Secrets was updated on October 29, 2026 and Otter Smash Shello on October 22, 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.*