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Leader Builder

Leader Builder

You finally dial in all the line, leader, and tip combinations that work best with your rods, conditions and casting ability. Now, fast forward to next season - your rigging up at the truck in the pre-dawn light and can't remember which line and tip goes with which least of which whether or now you need T8 or T11 to fish this new intruder pattern on the run you are about to step in. Leader Builder ends that.

Save the leader recipes that actually fish on each of your rods. Add casting notes for what makes each one work. Next time you grip that rod at the river, the recipe is one tap away.

📱 Platform iPhone · Android
🏷️ Category Sports · Fly Fishing
🆓 Pricing Free
Join the Beta → See what it does

What it does

Keep a readily accessible and organized list of all line, tip and leader combinations that you use for every rod in every situation at your fingertips - approach that next run confident you have the right setup to get your fly in the target zone!

📖

Build leader recipes

A line + tip + leader, paired to a specific rod for specific water conditions (flow speed, target depth) and fly type.

✍️

Casting notes per recipe

Free-form memo for feel, anchor, loop shape, conditions where this rig shines. The note you'd write on the back of a fly box — searchable and synced.

🎣

Recall any recipe fast

Pick the rod you're fishing today and every recipe you've ever built for it is right there.

🧰

Curated catalog for recipe building

LDR | BLDR maintains a comprehensive list of readily available rods, lines, tips and leader building materials for you to quickly select from when configuring your recipes. If you don't see what you are looking for, add it and it will be there when you need it next!

📵

Works in the cell-dead canyon

Fully offline. Your recipes live on your device and sync up the next time you have a signal — because the spots you actually fish don't have 5G.

🔒

Privacy-first

No ads, no trackers, no analytics, no in-app purchases. Three sign-in options — Apple, Google, or email — so your recipes sync across your devices and nowhere else.

Free — and how we keep it free

Free

Leader Builder

100% Free
  • Unlimited recipes
  • Casting notes per recipe
  • Recall recipes by rod or water conditions
  • Curated gear catalog for recipe building
  • Offline-first sync
  • Apple · Google · Email sign-in
Amazon Affiliate

Tap "Buy on Amazon" in the app

Same price for you — small commission for the studio

Every line, leader, tip, and tippet material in the curated catalog has a Buy on Amazon button. When you tap it and complete a purchase, Leader Builder earns a small affiliate commission on what you buy that visit. The price you pay doesn't change — Amazon pays the commission out of their own margin.

Your local fly shop deserves first call. If you'd rather hand them the money, that's the right answer and we fully support it. The Amazon button is here for the times you were going to order from Amazon anyway — and an occasional purchase through it helps cover the operating costs (hosting, developer account, catalog upkeep) that maintain the online and offline infrastructure behind the app, and lets us avoid putting ads in front of you.

As an Amazon Associate, Moonshinerxwerks LLC earns from qualifying purchases. The affiliate relationship does not influence what we include in the curated catalog or which products we recommend. See our Privacy Policy for detail.

Join the Leader Builder Beta

Pre-launch as of fishing season 2026. Drop your email below and we'll send a TestFlight invite as soon as the next beta is ready.