# StringerPro: Stair Calculator — Stair stringer layout tool

> Stair stringer layout tool (iPhone/iPad app by ClearStack Apps.)

- Source: https://appshunter.io/ios/app/stringerpro-stair-calculator/id6799538997 (this page in markdown: same URL + `.md`)
- Developer: [ClearStack Apps](https://appshunter.io/developer/6798305739)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 10 MB
- Languages: American English
- Released: 2026-09-25
- Data updated: 2026-09-28
- User reviews in markdown: https://appshunter.io/ios/app/stringerpro-stair-calculator/id6799538997/reviews.md

## What is StringerPro?

StringerPro turns total rise and total run into a code-checked, ready-to-cut stair stringer layout.

Built for finish carpenters, framers and deck builders who want one tool that does the stringer job properly, including the bottom step.

KEY FEATURES

- Fraction-native input. Feet, whole inches and a sixteenths picker that works the way a construction calculator does. Common stops (0, 1/4, 1/2, 3/4) are one tap.
- IRC R311.7 code validation. Live green / amber / red badges for riser height (max 7-3/4"), tread depth (min 10"), riser variance, 2x12 throat (min 3-1/2"), comfort (rise plus tread), and pitch angle.
- The bottom step handled correctly. The bottom riser is automatically shortened by the tread thickness so walking rises stay uniform once treads are installed, a common source of uneven steps.
- Side-view diagram with every dimension labelled. A clean 2D elevation that prints legibly.
- Framing-square cut sheet. Step-by-step heel positions along the top edge of the 2x12, with rise leg and run leg dimensions for every notch, plus the seat and plumb end cuts.
- 1:1 print template. Tile the side view across letter pages at full scale, tape them together and trace straight onto the 2x12. Crop marks on every corner.
- Material estimator. Enter stringer count, stair width and lumber prices; get linear footage and total job cost, fasteners included.
- Saved jobs with job name, address and notes.
- Deck stair mode, which marks the job as a deck stair on the summary sheet. Set deck-board tread stock and nosing on the inputs screen.
- Imperial and metric, in light and dark appearance.
- Works entirely offline. No account and no sign-in.

PREMIUM UNLOCK (one-time purchase, not a subscription)

- Unlimited saved jobs
- All three PDF exports: summary, cut sheet and 1:1 print template
- Material estimator
- Removes ads
- Priority support

DISCLAIMER

Verify all measurements before cutting. Output is for estimation only. Local building codes vary.

Contact: support@clearstackapps.com
Privacy: https://clearstackapps.com/privacy

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| StringerPro Premium | $5.99 | one-time |



## Version history (last 1 release)

### 2.0.0 — 2026-09-25

No release notes.

## More apps by ClearStack Apps

- [Sourdough Calculator & Journal](https://appshunter.io/ios/app/sourdough-calculator-and-journal/id6798776262)
- [NotaryLog: Notary Journal App](https://appshunter.io/ios/app/notarylog-notary-journal-app/id6798790165)
- [PAT Testing Log & Cert](https://appshunter.io/ios/app/pat-testing-log-and-cert/id6798807631)
- [FireCalc: FIRE Retirement](https://appshunter.io/ios/app/firecalc-fire-retirement/id6798891218)
- [FireBook: Fire Safety Log](https://appshunter.io/ios/app/firebook-fire-safety-log/id6804766249)

All apps by ClearStack Apps: https://appshunter.io/developer/6798305739

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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 2026-09-28.*