# Stair Tangent > Stair building calculator for carpenters to ensure accurate stair construction. (iPhone/iPad app by Sim Ayers.) - Source: https://appshunter.io/ios/app/stair-tangent/id1173630967 (this page in markdown: same URL + `.md`) - Developer: [Sim Ayers](https://appshunter.io/developer/689788842) - Category: Business, Productivity - Price: $7.99 - Rating: 1.00/5 from 2 App Store ratings · 2 written reviews indexed - Age rating: 4+ - Requires: iOS 17.0 · 13 MB - Languages: American English - Released: 2016-11-08 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/stair-tangent/id1173630967/reviews.md ## What is Stair Tangent? 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 that don't build stairs everyday, but could use an stair building app calculator to check their stair building calculations. Build a set of stairs that you are gonna be proud of. With Stair Tangent you can elimenate cumulative math errors when building - constructing stairs. Six different types of stairs Build Stairs with: Locked Tread Width Unlocked Tread Width 45 Degree Stair Stringers Flared Stair Stringers Circular Stairs Stair Landing Height 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. Stair Riser Height and Stair Tread Width Building Code Complaint Error checking for Minimum stair Riser height of 4 1/2". Error checking for Maximum stair Riser height of 7 3/4". Error checking for Minimum Stair Tread Width of 10". Error checking for Circular Stairs with Minimum Stair Inside Tread width of 8". Error checking for Circular Stairs with Minimum Stair Walk Line Tread width of 10". ## Key features - Calculates six types of stairs - Locked and unlocked tread width options - Supports 45-degree and flared stair stringers - Circular stair layout - Building code compliance checks - Eliminates cumulative math errors ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/stair-tangent/id1173630967/reviews.md ### 1/5 — Don’t buy it trash *2020-12-18* Trash don’t buy it ### 1/5 — Garbage *2018-10-17* Very unhelpful. In addition, words are cut off, diagrams are tiny and no option to zoom. Was hoping to find formulas. Don’t waste your money. Buy books instead and learn some simple trigonometry. I’d give zero stars but it won’t let me. ## Frequently asked questions about Stair Tangent ### What types of stairs can Stair Tangent calculate? Stair Tangent can calculate six different types of stairs, including those with locked or unlocked tread widths, 45-degree stair stringers, flared stair stringers, and circular stairs. It also handles stair landing height calculations. ### Does Stair Tangent check for building code compliance? Yes, Stair Tangent checks for building code compliance. It enforces a minimum stair riser height of 4 1/2" and a maximum of 7 3/4", as well as minimum stair tread widths of 10" for standard stairs and 8" inside tread width for circular stairs. ### How does Stair Tangent help prevent errors? Stair Tangent is designed to eliminate cumulative math errors that can occur during stair construction. By entering a few key dimensions, the app provides all necessary information for building your stairs accurately. ### Is Stair Tangent easy to use for circular stairs? Yes, the app is designed for efficiency. It states that you can lay out circular stairs in 10 minutes or less, making complex calculations more manageable. ### What devices is Stair Tangent available on? Stair Tangent is available for iPhone and iPad devices. ### How often is Stair Tangent updated? The latest version of Stair Tangent is 1.5, which was last updated on May 3, 2024. This indicates active development and maintenance. ### What is the price of Stair Tangent? Stair Tangent is a paid application, priced at $7.99. There are no in-app purchases or advertisements mentioned. ### What is the user sentiment for Stair Tangent? Based on the available data, Stair Tangent has a rating of 1.0 stars from 2 ratings. This suggests a very low user satisfaction rate, which potential users should consider. ## Version history (last 5 releases) ### 1.5 — 2024-05-03 updated to iOS 17.0 ### 1.4 — 2023-09-07 updated to IOS 16 ### 1.3 — 2020-06-09 updated to iOS 13.4 ### 1.2 — 2019-03-01 Updated Certificate ### 1.1 — 2017-11-07 Updated to use IOS 11.0 ## More apps by Sim Ayers - [Rafter Tools+](https://appshunter.io/ios/app/rafter-tools-plus/id689788839) - [Crown Molding Tools](https://appshunter.io/ios/app/crown-molding-tools/id894395519) - [help-desk](https://appshunter.io/ios/app/help-desk/id6759624979) - [Stair Tangent Dark](https://appshunter.io/ios/app/stair-tangent-dark/id6761790615) - [RafterTools+ Dark](https://appshunter.io/ios/app/raftertools-plus-dark/id6762562883) All apps by Sim Ayers: https://appshunter.io/developer/689788842 --- *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 2026-06-10.*