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Show HN: Submarius – Global water clarity for divers

Hacker News · Jun 20, 2026, 11:29 PM

Key takeaways

  • Submarius is a mobile-first app for spearos, divers, fishermen, and boaters.
  • How the score works Anonymous-first.
  • The only app that predicts how far you'll see underwater.

Submarius is a mobile-first app for spearos, divers, fishermen, and boaters. Real water-clarity forecasts, honest bite scores, and a verdict — not another dashboard — for every activity on the water.

How the score works Anonymous-first. Safety features permanently free. No auth wall.

Water clarity forecast. The only app that predicts how far you'll see underwater. Satellite Kd490 turbidity, river-discharge plumes, wave mixing, and post-dive reports feed a physically-grounded visibility model. Honest uncertainty, not wishful thinking.

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