---
title: "Stair Tangent Dark — App Overview"
url: https://marlvel.ai/apps/stair-tangent-dark
category: Education
developer: Sim Ayers
platforms: ios
rating: N/A (0 ratings)
pricing: paid
report_level: overview
generated: 2026-05-05
last_verified: "2026-05-05T05:35:36.578Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** This is a niche utility tool that digitizes complex stair-building geometry to improve accuracy for non-specialist carpenters.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Education |
| Rating | N/A ★ (0) |
| Pricing | paid |
| Platforms | iOS |
| Latest Version (iOS) | 1.6 |
| Developer | Sim Ayers |

<!-- SECTION: Summary -->
## What is Stair Tangent Dark?

Stair Tangent Dark is a specialized calculator designed to assist rough-frame carpenters in performing precise stair-building calculations. The app aims to reduce cumulative math errors by providing automated layouts for complex structures, including elliptical and circular stairs.

<!-- SECTION: Key Features -->
## Key Features

- **Stair Geometry Calculators**: Provides twelve distinct calculation modes, including locked/unlocked tread width, 45-degree stringers, and flared stair stringers.
- **Advanced Layout Tools**: Includes specialized modules for circular stairs, elliptical stairs, and ellipse point layout for X-Y plotting.
- **Winder and Landing Support**: Calculates dimensions for stair landing heights, French winders, and polygon winders.
- **Arc Radius Calculation**: Offers a dedicated tool for determining arc radius to support complex stair design requirements.

<!-- SECTION: Target Audience -->
## Who is it for?

Rough-frame carpenters who require occasional assistance with stair-building geometry and layout calculations.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/stair-tangent-dark/id6761790615?uo=4)
- [Full Intelligence Report](https://marlvel.ai/apps/stair-tangent-dark)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/apps/stair-tangent-dark).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*