Submarius: Dive & Spearfishing
Diving Conditions & Visibility
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Realtime ocean conditions for spearos, divers, fishermen, and boaters. Wrecks and reefs, bite scores, water clarity, tides, swell, wind, radar, bathymetry, and more
Submarius reads the ocean and reports everything you need to know to make a decision. Dive weather, bite forecast, and water clarity forecast for spearfishing, diving, fishing, and boating — built for people who are tired of stitching together four apps to decide if today is worth the drive.
App Sections:
- Conditions Dashboard
- Map (with reefs and wrecks, live/forecasted radar, water clarity overlay, wind, and more)
- Fish (what species can I expect to find at my set location, what are the laws and regulations, images of the fish)
Every factor — wind, swell, tide, moon, pressure, water temp, water clarity — goes into a single 0–10 verdict you can read in two seconds. Tap any factor to see the numbers and the reasoning. No black-box "AI" — every input is transparent.
Water Clarity Forecast
No other major app has this. Submarius blends satellite turbidity (NOAA CoastWatch Kd490), USGS river-plume detection, wave-mixing physics, and community post-dive reports into an honest Secchi-depth estimate with explicit uncertainty. Grounded in Lee et al. 2015 (R²=0.96). When we don't know, we say so.
Activity Modes
Spearfishing, freediving, scuba, rod-and-reel fishing, boating, sailing, surfing, kayak/SUP. Each mode reweights the verdict around what actually matters for that activity — clarity and tide for spearos, swell period and wind for surfers, bite windows for anglers, small-craft advisories for boaters.
Bite Score
Dive forecast with water clarity, bite score, swell, tide, and moon — every factor explained. Tide stage, moon phase, solunar windows, barometric trend, wind, and water temperature — combined into a 0–10 score, factor by factor. No secret formula. If we score a day a 3, you'll know exactly why.
Map Layers
Self-hosted bathymetry + sea-surface temperature + animated weather radar + wind particle flow + reef and wreck structure overlays. Finds drop-offs, temp breaks, and shelter without dragging you to another app.
Live GPS Tracks
Record your dive or fishing trip as a live blue track on the map. Useful for retracing drift, marking productive zones, or just remembering the line you swam.
Safety, Always Free
Shark-tag alerts (OCEARCH), community shark sightings, SOS, and buddy GPS sharing are permanently free for every user, every tier. No paywall, no trial — by design.
Privacy by default
Your spots stay your spots. GPS-fuzzed to ~1 km on anything public; precise location never leaves your device unless you explicitly share it. Post-dive clarity reports ship with H3-fuzzed coordinates only — we can't give away where you dive because we never see it.
Anonymous
Current conditions, 2-day forecast, basic bite score, and every safety feature work without an account. Sign up when you want to save spots or post catches.
Submarius Pro
Pro unlocks the 8-day forecast, premium map overlays, offline maps, unlimited saved spots, advanced bite score layers, full water-clarity horizons, and catch history export. $12.99/month or $99/year with a 7-day free trial. Limited $149 lifetime tier for the first 1,000 founders.
Subscriptions bill through your Apple ID and renew automatically unless cancelled at least 24 hours before the end of the current period. Manage in Settings → Apple ID → Subscriptions.
Privacy: https://submarius.com/privacy
Terms: https://submarius.com/terms
Promotional and sale pricing now displays consistently and always matches what you are charged.
More reliable location handling.
Reliability and performance improvements under the hood.
The developer, Roger VanDeburgh, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Contact Info
- User Content
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Roger VanDeburgh
- Size
- 30 MB
- Category
- Weather
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Submarius Pro $12.99
- Submarius Pro — Lifetime $149.00
- Submarius Pro $99.00
- Copyright
- © Submarius LLC
