# Marla Blue vs Kaicast

The clearest difference is in-app purchases: Kaicast at none against Marla Blue's 4. Kaicast also leads on ads (none vs shown) and rating (5.0 vs 4.8). Marla Blue's advantage is update cadence (every 3 days vs weekly) and ratings volume (4 vs 1). On price, review sentiment and iOS requirement there is nothing between them.

Both are free to download. Marla Blue sells 4 in-app purchases, starting at $9.99 per month. Kaicast asks for nothing beyond the download.

Kaicast holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Marla Blue ships an update every 3 days, Kaicast weekly. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Marla Blue | Kaicast |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (4 ratings)](https://appshunter.io/ios/app/marla-blue-diving-forecasts/id6673897108/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/kaicast/id6792198297/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | Free with in-app purchases | **Free** |
| Size | 94 MB | 93 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ocean AI](https://appshunter.io/developer/1767770858) | [Kaicast](https://appshunter.io/developer/6792198299) |

## What reviewers say

### Marla Blue

[App page](https://appshunter.io/ios/app/marla-blue-diving-forecasts/id6673897108)

Plan your underwater adventures with detailed marine weather forecasts. Get AI-powered visibility predictions, swell, wind, tide, and temperature data for over 1500 dive spots worldwide. Receive algae bloom alerts and real-time reports from a community of local divers.

**Highlights:** Underwater visibility forecasts (AI & satellite), Swell, wind, tides, water temperature, Algae bloom alerts, Real-time viz reports & photos, 1500+ global dive spots, Community-driven insights

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Marla Blue Monthly | $9.99 | per month |
| Dive Season Pass (6 months) | $34.99 | per 6 months |
| Annual | $44.99 | per year |
| Marla Annual Subscription | $59.99 | per year |


### Kaicast

[App page](https://appshunter.io/ios/app/kaicast/id6792198297)

This app provides detailed ocean forecasts for Hawaii, focusing on conditions crucial for divers and water enthusiasts. It offers spot-specific predictions for visibility, surge, tide, swell, and wind, along with hazard awareness and a personal dive log.

**Highlights:** Spot-specific ocean conditions, Underwater visibility forecasts, Surge, tide, swell, and wind predictions, Hazard awareness alerts, Personal dive log, 10-day forecast horizon

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

**In-app purchases:** none


## Frequently asked questions

### Is Marla Blue free?

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

### Is Kaicast free?

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

### Which has better reviews, Marla Blue or Kaicast?

Kaicast is rated higher. Marla Blue averages 4.8 out of 5 from 4 ratings, while Kaicast averages 5.0 from 1 ratings.

### Do Marla Blue or Kaicast have ads?

Marla Blue shows ads; Kaicast does not.

### Which is updated more often, Marla Blue or Kaicast?

Marla Blue ships an update every 3 days, and Kaicast weekly. Most recently, Marla Blue was updated on November 8, 2026 and Kaicast 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.*