What Should I Throw? throwthis.fish

Fly fishing · Private beta, coming soon

Stop guessing.
Start catching.

Built for fly fishing. Stand at the water, open the app, and get a straight answer: the fly, the size, the rig, and why, based on live conditions, flows, and thousands of real fishing outcomes.

No cell signal? It still works. The app reads your phone's own sensors right there on the river.

And your water stays yours.

Beta program ↓
Sample recommendationNo service · 09:15

Blacksmith Fork

41.62° N · 111.73° W · fuzzed

Water
46°F
Flow
58 cfs
Pressure · phone
30.02 ↓
Wind
SW 4
Sky
Overcast
Species
Brown

Throw this

BWO parachute emerger, #20

6X tippet · dead drift the soft seams · trail a #20 Pheasant Tail. Overcast and falling pressure is Blue-Winged Olive weather; fall flows are low and clear, so go long on the leader and soft on the approach.

Matched against 1,284 logged outcomes in similar conditions

How it works

Thirty seconds, start to cast.

  1. 01

    Open it at the water

    It reads your location and barometric pressure straight from your phone, no signal needed. Pick your species. That's the setup.

  2. 02

    Get a straight answer

    A specific fly, size, and rig (dry, nymph, or streamer), matched to real outcomes in similar conditions. You get the reasoning too.

  3. 03

    Tell us how it went

    Thumbs up, thumbs down, log the fish. Five seconds, and every angler's next answer gets sharper.

Off the grid

The best water has no bars.

The fish are where the signal isn't. So the app doesn't need a connection. It reads the sensors already in your phone and works out the answer on the phone itself, at the bottom of the canyon.

A small fishing model rides along on your phone. It's built on real fishing outcomes, and it reads live variables straight from your phone's sensors to make the call without phoning home.

GPS

Where you are

Satellite positioning works with zero bars. It knows which water you're standing in.

Barometer

Pressure, live

Your phone measures air pressure itself, so it catches a falling barometer as the front moves in.

Clock + compass

Light and sun

Time of day, sun angle, and which way you're facing, all worked out on the phone.

Synced before you go

Flows and forecast

Stream flows and the forecast download while you still have service, then ride along offline.

The promise

Your water is sacred.

The system learns what works.
It never learns where you fish.

  • 01Coordinates are fuzzed

    Locations are anonymized and aggregated before they get anywhere near a model.

  • 02No heat maps. Ever.

    We will never build a feature that helps another angler find your runs and riffles. Not as a setting, not as a premium tier.

  • 03Sharing is opt-in, per spot

    Share a spot with your fishing buddies if you want to. The default is off.

  • 04Your data, your exit

    Export everything, or delete your account and it's gone.

Why we built it

Built by fly anglers, because we wanted it to exist.

Every fishing app wants to show you where everyone else is catching fish. We wanted the opposite: tell me what to tie on at the run I'm already standing in, and keep that run to myself.

So we built it, on hardware we own and run ourselves. Turns out it works.

Beta program

Fish it before everybody else does.

We're opening a limited beta for fly anglers who'll actually log their days on the water and tell us what worked. Sign-ups open soon.

Sign-ups not open yet