Visual Pipe Run Builder
Add elbows, tees, valves, and unions with selectable material and size. See total equivalent length and live pressure loss as you go.
Pipe Sizing That Flows, Offline & Accurate
FlowSpec Sizer turns code-table math into a visual pipe model. Build runs, get live pressure loss, size pumps, and export job sheets—no signal needed.
Download for iOSView sample specs
Built for the trades that build
FlowSpec Sizer is the offline-first workbench for plumbers, irrigation installers, and serious DIYers. Instead of wrestling paper friction-loss charts, you assemble a pipe run from real fittings, pick a material, and instantly see pressure drop, velocity, and the smallest compliant diameter. The app bundles a complete local library of pipe specs, fixture units, and calculators for pump head, hot-water recirculation, and demand estimation. Every project saves on your device—no accounts, no ads, no placeholders. It’s the confidence of accurate sizing, right in your pocket, even in a basement with zero bars.
A workbench, not a lookup table
Hazen-Williams Solver
Choose C-factor for PEX, copper, PVC, CPVC, or galvanized. Get friction loss, velocity, and pass/warn flags instantly.
Sizing Assistant with Reasoning
Input target flow and max allowable drop. The app returns the smallest compliant pipe size and explains why in one line.
Fixture Demand Estimator
Check off 40 preloaded fixtures—toilets, sinks, appliances—and get a fixture-unit curve to apply directly to any run.
Pump Head & Recirculation
Size pumps from static lift and friction, design hot-water loops with return size and BTU load, all with velocity checks.
Offline Library & Job PDFs
Browse pressure/temperature ratings and ASTM data. Save runs with notes and export a one-page PDF diagram and results.
Trusted by installers
40+Fixture units included
4.8★Average rating from trades
100%On-device, no cloud
10+Material types in library
Illustrative marketing figures; not App Store metrics.
From rough-in to report
