Fish when they're feeding.
Major and minor feeding periods, computed on your device from the real position of the moon and sun — the same astronomy observatories use. Works offline, anywhere on Earth. No ads. No tracking. No subscriptions.
The moon sets the table. We do the math.
Solunar theory, published by John Alden Knight in 1926, holds that fish and game feed hardest when the moon is directly overhead or directly underfoot — the major periods — and around moonrise and moonset — the minors. Biteline computes those four windows from real lunar positions using Jean Meeus' astronomical algorithms, not a lookup table.
- Majors at lunar transit — overhead and underfoot, ±1 hour.
- Minors at moonrise and moonset, ±30 minutes.
- Computed on-device — works with zero signal at the lake.
- Any coordinates, any date. Plan next weekend's trip.
New moon. Full moon. Go.
The strongest feeding activity clusters around the new and full moon, and peaks again when a major period overlaps dawn or dusk. Biteline rates every day of the month from one to four fish, so you can plan trips around the days that are worth the fuel.
Day ratings for the current month, computed live.
The only thing we track is the moon.
No account. No server. No analytics. Your location is read once, on your device, to compute your times — and never leaves it. Your secret spot stays secret.
- No accounts
- No ads
- No tracking
- Fully offline
The fish don't pay monthly. Neither should you.
Biteline is a one-time purchase. No subscriptions, no ads, no upsells, no follow-up emails — just an app that tells you when to be on the water, for as long as you fish.