Hatch Window

Fly Fishing Conditions & Log

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

Live streamflow, sunrise/sunset and solunar windows for your spots, a hatch chart by month and region, and a catch log. No account, no ads, free. Hatch Window is a fly-fishing companion for deciding where to go, when to go, and what to tie on — built to run entirely on your phone. WHERE TO GO A curated starter list of well-known trout waters, plus any spots you add yourself. Everything is saved on-device. CONDITIONS, NOT GUESSES Live streamflow (cfs) and gauge height for each spot, pulled from the USGS Water Services API. If a gauge has no data, is offline, or the network fails, Hatch Window says so — it never shows a made-up number. BEST TIMES TO FISH Sunrise, sunset, civil twilight, and solunar major/minor feeding windows, computed on your device from standard astronomical formulas. Solunar theory is a traditional angling heuristic, and the app says so — no overclaiming. PLAN AHEAD A 7-day outlook per spot ranks the coming days by their best solunar window, so you can pick your day instead of only checking today. ALL YOUR SPOTS AT A GLANCE A dashboard shows every saved spot's live conditions in one view, sorted by a plain "fishing well right now" heuristic — fresh, steady flow first. WHAT TO TIE ON A hatch chart matches insect activity to fly patterns by month, water type, and region — covering Western, Northeast, Midwest, and Southern trout water, not just one corner of the country. YOUR CATCH LOG Log the date, spot, flies, conditions, and notes for every outing. It stays on your device, survives app updates, and builds a "what worked here before" view for each spot — plus a one-tap shareable outing report. PRIVACY No account, no login, no ads, no tracking. Hatch Window talks to exactly two free public data services — USGS Water Services for stream conditions and Open-Meteo for weather — and nothing else. Your catch log and spot list never leave your device. Full privacy policy is in the app. Hatch Window is a v1 built by one angler who wanted these five things in one place instead of five different tabs. More coverage and features are on the way.

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The developer, Baker Ventures LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Location

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Information

Seller
Baker Ventures LLC
Size
36.7 MB
Category
Sports
Compatibility
Requires iOS 16.4 or later.
  • iPhone
    Requires iOS 16.4 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English
Age Rating
4+
Copyright
© 2026 Baker Ventures LLC
  • Privacy Policy

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