# FlowSpec Sizer — Pipe sizing without the math

> Pipe sizing without the math (iPhone/iPad app by Christopher Hayes.)

- Source: https://appshunter.io/ios/app/flowspec-sizer/id6799651701 (this page in markdown: same URL + `.md`)
- Developer: [Christopher Hayes](https://appshunter.io/developer/6795180403)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 5 MB
- Languages: American English
- Released: 2026-08-12
- Data updated: 2026-09-05
- User reviews in markdown: https://appshunter.io/ios/app/flowspec-sizer/id6799651701/reviews.md

## What is FlowSpec Sizer?

FlowSpec Sizer is an offline-first pipe-sizing and pressure-drop workbench for plumbing apprentices, irrigation installers, and meticulous DIYers. Stop digging through paper friction-loss charts: assemble a pipe run from lengths and fittings, choose your material, and instantly see pressure loss per 100 ft, flow velocity, and the smallest compliant pipe diameter.

Build a run the way you work: add straight segments plus elbows, tees, valves, and unions, each with a selected material and diameter. FlowSpec Sizer calculates total equivalent length and live pressure loss as you edit. Run the Hazen-Williams solver with your flow rate or fixture units, set the C-factor for PEX, copper, PVC, CPVC, or galvanized steel, and get friction loss, velocity, and clear pass/warn flags. Use the sizing assistant to enter target flow and maximum allowable drop; the app returns the smallest compliant size with a short reasoning line.

Estimate fixture demand from 40 preloaded fixture types, apply the fixture-unit curve directly to a run, and design a pump by computing total dynamic head from static lift, friction loss, and desired discharge pressure. Need hot-water recirculation? Calculate return-pipe size, required pump flow, and BTU load from pipe length and insulation.

The built-in library covers pressure/temperature ratings, working C-factors, and typical uses for common pipe types, including ASTM/PPI data snapshots. Save and duplicate entire runs, add notes, and export a one-page PDF job sheet with a diagram, inputs, and results. A Home Screen widget gives you daily size/velocity/friction benchmarks for quick off-the-job reference.

Everything stays on your device — no accounts, no ads, no placeholders. FlowSpec Sizer is built for the field.


## Version history (last 1 release)

### 1.0 — 2026-08-12

No release notes.

## More apps by Christopher Hayes

- [Multi Armories](https://appshunter.io/ios/app/multi-armories/id6795180401)
- [FocusBand Field Kit](https://appshunter.io/ios/app/focusband-field-kit/id6804777784)

All apps by Christopher Hayes: https://appshunter.io/developer/6795180403

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-05.*