App Overview

Steel Size Selector icon

Steel Size Selector

Allen Moore · Reference

top flipping through manuals

$4.99 · In-app purchases

PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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Build Kit

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A product spec, screen plans, and build steps for your coding agent.

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Combine features and design from your favorite apps.

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What's included15 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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Free quick prompt For a smaller starting point

Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Steel Size Selector: map the core Reference workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Include step-by-step guides or tooltips for each input.

Assumption to check: Users may struggle with complex calculations without guidance

Validate with people who use this workflow before building.

Hypothesis 2

Add 3D models or visuals to help users better understand sizes.

Assumption to check: Limited visual representation of results

Validate with people who use this workflow before building.

Hypothesis 3

Implement export options for users to save or share their results.

Assumption to check: No option to save or share calculations

Validate with people who use this workflow before building.

Hypothesis 4

Clarify which features require payment and provide a free trial.

Assumption to check: In-app purchase confusion

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

top flipping through manuals. Get instant access to standard structural steel dimensions right in your pocket. Steel Selector is the ultimate digital handbook for structural engineers, steel detailers, fabricators, and architects. Designed for speed and accuracy, it replaces cumbersome charts with a clean, modern interface that lets you find the exact properties you need in seconds. VISUAL & INTUITIVE Unlike basic spreadsheet apps, Steel Selector features Dynamic Diagrams. Every shape is rendered with a crystal-clear, high-contrast graphic that updates instantly as you make selections. Dimension lines clearly indicate exactly where measurements like Depth (d), Flange Width (b f ​ ), and k det ​ apply, eliminating guesswork. SMART SELECTION Finding the right beam is faster than ever. Our Smart Picker system filters data intelligently: simply select your nominal Depth or Size, and the app instantly updates the available Weights or Thicknesses. No more scrolling through lists of hundreds of irrelevant sizes. BUILT FOR THE JOB SITE Complete Library: Access data for W, M, S, HP, C, MC, WT, ST, and L (Angle) shapes. Dark Mode: Fully optimized for low-light environments with high-contrast, easy-to-read text. One-Handed Use: Controls are anchored to the bottom of the screen, making it easy to use on large phones while carrying drawings or tools. Offline Ready: All data is stored locally. No internet connection required. SUPPORTED SHAPES W-Shapes: Wide Flange Beams S-Shapes: American Standard Beams M-Shapes: Junior Beams HP-Shapes: Bearing Piles C-Shapes: Standard Channels MC-Shapes: Miscellaneous Channels WT-Shapes: Structural Tees (from W-Shapes) ST-Shapes: Structural Tees (from S-Shapes) L-Shapes: Angles (Equal & Unequal Legs) Streamline your workflow with Steel Selector.

Written user reviews are not shown here. Check current App Store reviews >

Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

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BUILD KIT DIFFICULTY
Intermediate

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.