# Ocean Watch vs DiveSlate

The clearest difference is review sentiment: Ocean Watch at 74% against DiveSlate's 0%. Ocean Watch also leads on rating (4.8 vs 4.0) and in-app purchases (none vs 3). DiveSlate's advantage is update cadence (every 2 weeks vs every 9 months) and iOS requirement (13.0 vs 26.0). On price and ads there is nothing between them.

Both are free to download. DiveSlate sells 3 in-app purchases, starting at $2.99 per month. Ocean Watch asks for nothing beyond the download.

Ocean Watch holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Ocean Watch has 2.7K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 74% of Ocean Watch's written reviews are positive against 0% of DiveSlate's.

Ocean Watch ships an update every 9 months, DiveSlate every 2 weeks. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Ocean Watch | DiveSlate |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (2.7K ratings)](https://appshunter.io/ios/app/ocean-watch/id865207409/reviews)** | [4.0 (2 ratings)](https://appshunter.io/ios/app/diveslate/id6761025011/reviews) |
| Number of ratings | **2.7K** | 2 |
| Positive reviews | **73.6% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 weeks** |
| Monetization | Paid | **Freemium** |
| Size | 137 MB | 108 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Blue Bright Labs LLC](https://appshunter.io/developer/865207412) | [BlueWizard, LLC](https://appshunter.io/developer/1887350489) |

## What reviewers say

### Ocean Watch

[App page](https://appshunter.io/ios/app/ocean-watch/id865207409)

Access tide predictions for over 3,300 stations across the US and Caribbean. Visualize tide data with stunning graphics and an interactive almanac. Plan your activities with offline access to predictions and custom notes.

**Highlights:** 3,300+ tide stations, Stunning graphics and visualizations, Offline tide predictions, Interactive almanac, Integrated station map, Custom notes and images

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

**In-app purchases:** none

**What reviewers like**

- 👍 Accurate tide information
- 🌟 Excellent app design and user experience
- ⏱️ Quick and responsive
- 🔍 Useful for planning beach activities
- 🗺️ Supports multiple locations

**What reviewers complain about**

- 🐛 Occasional crashes or bugs
- 🔍 Limited coverage for some areas (e.g., Canada)
- 🔍 Inconsistent performance on Apple Watch
- 🔍 Complications not always accurate or up-to-date
- 🔍 Difficulty setting favorites or customizing the app

**Reported bugs**

- App crashes when trying to open tide station details
- Tide data sometimes stuck on wrong location
- Apple Watch app not syncing or updating correctly
- Issues with the app's widget not displaying accurate information

**Requested features**

- Add water temperature and wind speed data
- Improve Apple Watch complication to show more detailed tide information
- Expand coverage to more locations, especially in Canada and other countries
- Add ability to set tide alerts or notifications
- Improve stability and reliability to reduce crashes


### DiveSlate

[App page](https://appshunter.io/ios/app/diveslate/id6761025011)

This app provides a dive-ability score based on tides, waves, wind, weather, visibility, and currents. It offers current conditions, hourly forecasts, and highlights the best dive windows. Users can also contribute condition reports and set smart alerts for favorite dive sites.

**Highlights:** Dive-ability score algorithm, Current dive site conditions, Hourly and 7-day forecasts, Best dive window highlights, Interactive dive site map, Community condition reporting, Smart condition alerts

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $2.99 | per month |
| Pro Annual | $12.99 | per year |
| Pro Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is Ocean Watch free?

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

### Is DiveSlate free?

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

### Which has better reviews, Ocean Watch or DiveSlate?

Ocean Watch is rated higher. Ocean Watch averages 4.8 out of 5 from 2.7K ratings, while DiveSlate averages 4.0 from 2 ratings.

### Do Ocean Watch or DiveSlate have ads?

Neither Ocean Watch nor DiveSlate shows ads.

### Which is updated more often, Ocean Watch or DiveSlate?

Ocean Watch ships an update every 9 months, and DiveSlate every 2 weeks. Most recently, Ocean Watch was updated on November 1, 2026 and DiveSlate on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*