Fly fishing · our flagship
Rise Daisy
Treats a river as something you calculate, not a weather pin.
It tells fly anglers whether a river is fishable today, what's hatching and what to tie on, and when to leave the fish alone. Web, iPhone and Android, in English, Spanish, French and German.
2,300+
fishing venues in 35 countries
as of 11 November 2026
1,370
river gauge stations wired in
as of 11 November 2026
141
hatch triggers in the insect engine
as of 11 November 2026
903
fly patterns, matched to what hatches
as of 11 November 2026
The problem
A weather app tells you it will rain. An angler needs to know what that rain will do to one river: how high it rises, how coloured it runs, how warm it is, and whether the flies will hatch.
Where it works
Rivers and lakes in 35 countries
Every pin is a venue with its own page: rivers in blue, stillwaters in green, with each country shaded by how many venues it has.
What's clever
Five things it does that a weather app can't
It predicts the hatch, not just the weather.
Insects need accumulated warmth before they emerge, so the engine counts degree-days and watches for triggers like warm rain after cold. It adjusts for chalk streams, tailwaters and freestones, across 141 hatch triggers.
Plugged into river gauges in 35 countries.
Each of 67 national and regional gauge networks gets its own adapter that turns its readings into one shared format. Where a river has no gauge, it borrows a similar neighbour's, and says only "high, normal or low" rather than inventing precise figures.
The right fly for what's actually hatching.
The fly box follows the hatch, drawing on 903 patterns across regional fly lists. On club waters it also respects the club's own rules, so it never suggests a fly you can't use there.
An app that tells you not to fish.
Heat limits for catch-and-release override every other score. It flags heat stress before Montana posts its official river closures, and warns when dam releases can raise a tailwater fast.
A water-temperature model that checks itself.
Estimates are checked against real gauge temperatures every day. The same check caught a Spey logger that had sent filler data for two and a half years, and about 78 more like it.
Behind the build
Stack. Next.js, Supabase and Capacitor: one codebase for web, iPhone and Android.
Data. 38 scheduled jobs pull gauges, weather, degree-days and open biodiversity records.
Care. 377 test files, and a daily check of the model against real river temperatures.
Who uses it
Fly anglers checking one river before they set off
Trout, salmon, sea-trout and grayling anglers across Europe and North America. Audience figures are in the media kit.
Partner with usExample placement
Supported by, on a river page
- Where
- Under the conditions on a venue page
- Who sees it
- Anglers checking that river
- Price
- Ask for the media kit
Want something like this?
The same engine already runs a club's own app
Hungerford Fishery's members' app is built on Rise Daisy, with its own beats, rules, flies and tickets. Tell us about your water.
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