A real model layered on top of the ocean — telling you where the marlin, tuna, mahi mahi and the rest of the pelagics actually are. Satellite-fed, updated daily, 12 species and counting.
For years, finding offshore fish meant subscribing to raw satellite imagery, learning to read the sea-surface temperature charts yourself, learning to spot the productive water, learning to read the spinning ocean structure, and then doing the interpretation in your head before you steamed out. HSI does the interpretation for you.
The model looks at five things, all at once, every day. Each one tells you something different about where the fish should be. The score is what you actually want to know: given everything I can see, how good does this patch of water look right now, for the species I care about?
Five layers, one score. Each layer tells the model something different about the ocean — together they tell it where the fish should be.
Pelagic species hunt along the seams where warm water meets cold. The model checks satellite SST every day, finds the warm-cold edges automatically, and tells you how close each spot is to one. You don't need to learn to read a thermal-gradient chart — it's already in the score.
The big swirling features that pelagics actively track — warm-core and cold-core spinning bodies of water that concentrate baitfish along their edges. The model knows where they are, which way they spin, and which species favour which type. Yellowfin and southern bluefin prefer one kind. Black marlin and mahi mahi prefer the other.
Where the green stuff is, the baitfish are. Where the baitfish are, the predators follow. The model factors in productivity-rich water bodies and the boundaries where they meet clearer blue water — that's where the bait gets concentrated.
The model knows where the seamounts, ledges, drop-offs and submarine canyons are. So it basically knows the contours of the seabed and finds the good fishing structure for you automatically — you don't have to scroll through a chart looking for the 200m line.
Where the surface flow is heading and, more importantly, where the shear lines set up — those long lines where current speed changes and bait gets pushed up against the boundary. Same principle as the temperature edges, just for water movement.
Each species has its own thermal sweet spot, eddy affinity and depth preference baked in. Pick a species, see its heatmap.
More species are rolling out as we validate them against real catches. If you fish a species that's not on this list and want it added, drop a note via the chat in the app.
There's a code field at checkout. Friend codes get you HSI free for as long as you want it. Founder gives them out — if you know Olli, just ask.
Anyone who signed up before October 5, 2026 gets HSI free for life. As a thank-you for being there early. The app checks your account creation date and unlocks HSI automatically — nothing you need to do.
It's a 0-to-100 score for how good the conditions look at any patch of water, for the species you've picked. Higher score = more of the things that species likes (right temperature, near a productive edge, good structure underneath, baitfish around). It's not a guarantee — fish are still fish — but it's the best read we can give you of where to actually go.
Twelve to start: yellowfin and southern bluefin tuna, all three marlin (black, blue, striped), mahi mahi, wahoo, yellowtail kingfish, bonito, plus broader pelagic / reef / gamefish groups. More species roll out over the coming months as we validate them against real catch data.
We validate it against real catches that were held back from the training data. It's good. It's not magic. Some days the fish do their own thing and the model is wrong — that's the nature of the ocean. But over time, the spots the model lights up are where the catches come in.
Yes — the upstream data sources are global. AU and NZ are the most thoroughly calibrated because that's where most of our training catches come from. US East Coast, Hawaii, and the broader Pacific should work well. Coverage tightens up as catches roll in from each region.
Yes. Cancel any time during the 7 days and you don't get charged. After the trial ends, the subscription rolls over to A$49/yr (or A$5.99/mo if you picked monthly) and you can still cancel any time — no minimum term.
Just ask him. Friend codes get you HSI free for as long as you want it. There's a "Promo code" field at checkout. If you don't have a code yet, drop Olli a message via the chat in the app or any of the social links at the bottom of the page.
No. Anyone who signed up before October 5, 2026 gets HSI free for life as a thank-you for being there early. No action needed — the app checks your account creation date and unlocks HSI automatically.
No — HSI is just one feature. The bite score, the live map, the spot pages, the tide model, the catch logging, the species and regulations content — all of that stays free, for everyone, forever. HSI is the layer on top for offshore anglers who want the satellite-fed habitat read.
We don't publish the recipe — the specific data sources, the exact model architecture, the validation numbers. The reasoning is simple: this took months of integration work to get right, and the offshore-intelligence incumbents that we're catching up with deliberately don't publish theirs either. We'd rather you trust the score on the merits than reverse-engineer the inputs.
What we will say: the model is multi-input, the inputs are all real upstream data (no Solunar-style 1926 lookups), and it's trained on millions of real catches across over a thousand species. It's validated against catches we held back from training. The fish keep getting caught, so the model keeps getting sharper.
Olli-Mikael Vaittinen has fished his whole life. Fifteen years of fly fishing, guiding seasons on Norway's Lakselva — his favourite Atlantic salmon river — and a blue marlin landed in Vava'u, Tonga. Founder of Fishare — the app that puts the data behind the decisions every angler makes on the water.
Fishare tracks your home spots and pings you when the next 3-hour peak window opens. Log catches and blanks to teach the model your local patterns. Free forever for everyone who joins now.
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