Submarius vs Fishbrain.
Both are good apps. They solve different problems. If you want a species-and-catch database with a weather overlay, Fishbrain is well-polished and has been at it longer. If you want a single decisive verdict — "is today worth it?" — with honest water-clarity forecasts and safety features that never become paid features, Submarius is built for that question.
| Feature | Submarius | Fishbrain |
|---|---|---|
| Single-number verdict (0–10) | ✓ | — |
| Bite score with transparent factors | ✓ | BiteTime (paid, closed formula) |
| Water clarity forecast | ✓ dedicated model | — |
| 10-day marine forecast | ✓ | ✓ (paid) |
| Species database + catch log | Basic, growing | ✓ extensive |
| Community spots + heatmaps | Early | ✓ mature |
| Shark tag alerts (OCEARCH) | ✓ free forever | — |
| Safety features gated behind paywall | Never | Some Pro-only |
| Spot privacy (GPS fuzzing) | ✓ 1km by default | Privacy settings vary |
| Anonymous-first (no signup to use) | ✓ | — |
| Spearfishing-first signals | ✓ viz + tide + moon | Rod-and-reel focus |
| Monthly price | $12 / $99 yr | ~$10 / $75 yr |
Who should use Fishbrain?
If your primary use case is logging catches, building a personal history of where and when you've fished, browsing community catch heatmaps to find new spots, and using a mature species database to ID what you caught — Fishbrain is the better choice. It's been accumulating community data for over a decade. That's genuinely hard to replicate, and the network-effects moat is real.
Fishbrain is also excellent for bass and freshwater anglers. Its user base skews heavily toward US freshwater fishing, and the community content reflects that.
Who should use Submarius?
If your primary use case is making a go / no-go call the night before a dive or fishing trip — Submarius is built for that. The home screen is engineered to give you a decisive answer in under five seconds, with every factor tappable for the full breakdown.
Specifically:
- Spearos and divers. Our water-clarity forecast is unique in the space. Nobody else does this honestly.
- Conditions-first anglers. If you're deciding between two spots based on tide + moon + wind, the Bite Score aggregates all of it.
- Anyone who values safety features being free. Shark alerts, SOS, buddy GPS, breath-hold monitoring (phase 2) — permanently unpaywalled, by design.
- Privacy-sensitive users. We fuzz GPS on every public share by default. Spot privacy is structural, not a setting.
The philosophical difference.
Fishbrain is a database with a weather view bolted on. Submarius is a decision engine with a community bolted on. Both approaches are legitimate; they just optimize for different moments in your day.
Ask yourself: am I more often trying to remember what I caught — or decide if today is worth going?
Can you use both?
Absolutely. Many of our users check Submarius the night before for the verdict, then log the catch in whatever app they've been using for years. No lock-in. No "delete the other apps" marketing. Use the right tool for the moment.
Want to see how your spot scores right now?
Free. Anonymous. Five seconds to a verdict.