Seeded Formula Gallery
First-launch packs ship ready: Harvey, Ritz, 60/20/20, nymph compound, streamer short, salt shock-butt, euro scaffolds—each card shows sections, total length, and rod class.
Precision rivercraft · brass-ring geometry
TaperCast Leader Atlas
Size butt-to-tip diameters, lock mono/fluoro/furled per section, and stress-check the turnover cascade—so every trout, steelhead, bass, or light-salt cast turns over clean before you wet a boot.
Studio frames
Butt → tip silhouette · cascade · field card
Nine-Section Taper Builder
Add or drop sections; set ft/in or cm, X-rating or mm, and material. Live silhouette redraws butt-to-tip with brass-ring markers so the profile never lies.
Turnover Cascade Coach
Charts-backed energy hand-off flags weak mids, butt-too-soft collapse, and tippet bloat. Sliders for wind and fly wind-resistance—from sparkly dries to weighted nymphs.
Rod-Class Pairing Desk
Pick 2–12 wt single-hand or spey context; get butt-diameter bands, length windows, and stiffness notes so the butt matches line mass instead of hinging.
Tippet-to-Fly Matrix
Hook 18–1/0 plus fly family (delicate dry, terrestrial, nymph, streamer, crab) yields ranked tippet X, max length, and abrasion cautions for teeth or structure.
Vest Field Card + Widget
Large-type diameters, lengths, and material colors; Share Sheet image for lock-screen or print; Home Screen widget pins today’s recipe offline.
Leader geometry, not guesswork
TaperCast Leader Atlas is a hands-on leader-geometry studio for casters who refuse to guess tippet X or butt diameter on the bank. Open a seeded classic—Harvey dry, Ritz, 60/20/20, nymph compound, streamer short, light-salt shock butt, or euro-nymph long tippet—or start blank.
Dial up to nine sections against 2–12 wt single-hand or switch/spey context, assign nylon, fluorocarbon, or furled butts, then run the turnover cascade coach that flags soft mids, hinging, and overlong tippets under wind and fly drag. Match tippet to hook size and fly family, save named recipes to your shelf, and pin a large-type vest field card (or lock-screen export) so the formula you built stays readable when your hands are wet.
Fully offline SwiftData—no accounts, no cloud—just rod class, material physics, and fishable tapers.