Ocean Watch vs DiveSlate
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ocean Watch
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.
- 3,300+ tide stations
- Stunning graphics and visualizations
- Offline tide predictions
- Interactive almanac
- Integrated station map
- Custom notes and images
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Find your tide. Ocean Watch tracks tides at 3,300+ stations on every US coast, on iPhone, iPad, Mac and Apple Watch. It works offline. • Offline forecasts. Decades of data and the prediction engine are built in, so the tide is there when the signal isn't. • Tidemarks. Set a height so you know when the water will float your dock or expose your beach. • Beauty with insight. Interactive graphs and visualizations that let you feel the flow over time. • Plan ahead. The Almanac lets you travel into the future and pick your window for fishing, sailing, surfing or paddling. • The big picture. The Weeks at a Glance view lets you see the monthly trends as the moon waxes and wanes. • The little picture. Apple Watch, no iPhone needed. Every station on your wrist, with always-on complications. • Widgets. The tide on your Home Screen and everywhere else. • Area Map. See what's here and where you're going. • Share and export. Send the current tide as a picture, or export a week as CSV or PDF. • Your place is special. We've supplied gorgeous local photographs for many areas, and you can add your own. Stations outside the US and Caribbean have limited support.
DiveSlate
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.
- 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
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Stop guessing. Start diving. DiveSlate takes the guesswork out of dive planning. We pull together tides, waves, wind, weather, visibility, and currents into a single dive-ability score — updated throughout the day — so you can tell at a glance whether conditions are worth the trip. DIVE-ABILITY SCORE Our 6-factor algorithm combines wave height, wind speed, tidal flow, water visibility, weather conditions, and current strength into one easy-to-read score from 0 to 100. Green means go. Red means maybe hit the pub instead. CURRENT CONDITIONS See up-to-date data for every dive site: water temperature, wave height and period, wind speed and direction, tide stage, and recent visibility reports from fellow divers. HOURLY FORECASTS DiveSlate delivers hour-by-hour condition breakdowns for the current day. Upgrade to Pro for the full 7-day outlook so you can plan your week with confidence. BEST DIVE WINDOW No time to study charts? We highlight the single best window each day — the hour range when conditions peak — so you can plan around your schedule. INTERACTIVE MAP Browse 50+ dive sites across Florida on a beautiful map. Tap any pin to see current conditions, forecasts, and community reports. Filter by dive-ability score to find sites worth visiting right now. COMMUNITY CONDITION REPORTS After your dive, share a quick condition report — visibility, current, surface conditions — and help the entire community dive smarter. Reports feed back into our scoring model to improve accuracy over time. SMART ALERTS Set alerts for your favorite sites. DiveSlate notifies you when conditions hit your target score so you never miss a great dive day. 50+ DIVE SITES From the springs of North Florida to the reefs of the Keys, DiveSlate covers the sites you actually dive. Don't see the site you're going to? Request it through the app! More regions coming soon. DIVESLATE PRO Unlock the full experience with DiveSlate Pro: - 7-day extended forecasts - Best dive window recommendations - Site Insights: trends, best day, peak hours - Best This Week site rankings - Unlimited saved sites - Condition alert notifications $2.99/month or $12.99/year — start with a free 7-day trial. SUBSCRIPTION DETAILS - Payment is charged to your iTunes account at confirmation of purchase. - Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. - Your account will be charged for renewal within 24 hours prior to the end of the current period at the rate of your selected plan. - You can manage and cancel your subscriptions by going to your account settings on the App Store after purchase. - Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription. Privacy Policy: https://diveslate.com/privacy.html Terms of Service: https://diveslate.com/terms.html YOUR PRIVACY DiveSlate collects only what's needed to deliver accurate conditions. We do not sell your data. Location is used on-device to show nearby sites and is never stored on our servers. Read our full privacy policy at https://diveslate.com/privacy.html. Made by divers, for divers. ================================================================================ WHAT'S NEW (for version 1.0.0) ================================================================================ Welcome to DiveSlate! This is our very first release — we're stoked to have you. - 6-factor dive-ability score for every site - Current conditions: tides, waves, wind, visibility & more - Hourly and 7-day forecasts - Best dive window recommendations - Interactive map with 50+ Florida dive sites - Community condition reports - Smart alerts for your favorite sites - DiveSlate Pro with extended forecasts and unlimited alerts
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Ocean Watch | DiveSlate |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (2.7K ratings) — better | 4.0 (2 ratings) |
| Positive reviews | 73.6% of reviews — better | 0.0% of reviews |
| Number of ratings | 2.7K — better | 2 |
| Update frequency | Every 9 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Freemium — better |
| Devices | iPhone, iPad, Mac, Apple Watch — better | iPhone, iPod |
| Requires iOS | 26.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 137 MB | 108 MB |
| Age rating | 4+ | 4+ |
| Developer | Blue Bright Labs LLC | BlueWizard, LLC |
Customer experience
Ocean Watch
DiveSlate
Bugs and requests
Ocean Watch
Reported bugs
4 issues- 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
5 requests- 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
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ocean Watch
No in-app purchases
DiveSlate
- Pro Monthly7 Days trial$2.991 Month
- Pro Annual$12.991 Year
- Pro Lifetime$24.99









