# Stair Tangent Dark

> Stair Tangent Dark (iPhone/iPad app by Sim Ayers.)

- Source: https://appshunter.io/ios/app/stair-tangent-dark/id6761790615 (this page in markdown: same URL + `.md`)
- Developer: [Sim Ayers](https://appshunter.io/developer/689788842)
- Category: Education
- Price: $9.99
- Age rating: 4+
- Requires: iOS 26.0 · 20 MB
- Languages: English
- Released: 2026-04-10
- Data updated: 2026-05-16
- User reviews in markdown: https://appshunter.io/ios/app/stair-tangent-dark/id6761790615/reviews.md

## What is Stair Tangent Dark?

Professional Stair Builders don't need an app to build stairs; they just know how to build stairs. This iPhone app is for rough-frame carpenters who don't build stairs every day but could use a stair-building calculator to check their calculations.

Build a set of stairs that you are gonna be proud of. With Stair Tangent Dark, you can eliminate cumulative math errors when building or constructing stairs.

With the Elliptical Stairs calculations and Ellipse Point Layout for X-Y plotting, you can rival any professional stair builder's capabilities. 

Twelve different types of stair calculators
Build Stairs with:
Locked Tread Width
Unlocked Tread Width
Number of Risers
45 Degree Stair Stringers
Flared Stair Stringers
Circular Stairs
Elliptical Stairs
Ellipse Point Layout
Stair Landing Height
Arc Radius
French Winders Technique
Polygon Winders
Enter a couple of dimensions to see all of the information you need to build your stairs.
Layout circular stairs in 10 minutes or less. Elliptical stairs in 30 minutes or less. 

This app, the Dark version of Stair Tangent, does not calculate the cumulative dimensions for the stair stringer diagonal.


## Version history (last 5 releases)

### 1.6 — 2026-05-04

added a user walkthru, rate this app button, privacy policy and terms of service url link

### 1.3 — 2026-04-12

added popup windows with tool tips for the input fields

### 1.2 — 2026-04-11

updated the Ellipse X-Y plotting

### 1.1 — 2026-04-10

added missing images, replaced French 90 Winder with Ellipse Point Layout

### 1.0 — 2026-04-09

No release notes.

## More apps by Sim Ayers

- [Rafter Tools+](https://appshunter.io/ios/app/rafter-tools/id689788839)
- [Crown Molding Tools](https://appshunter.io/ios/app/crown-molding-tools/id894395519)
- [Stair Tangent](https://appshunter.io/ios/app/stair-tangent/id1173630967)
- [help-desk](https://appshunter.io/ios/app/help/id6759624979)
- [RafterTools+ Dark](https://appshunter.io/ios/app/raftertools-dark/id6762562883)

All apps by Sim Ayers: https://appshunter.io/developer/689788842

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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 2026-05-16.*