App Overview

Slope Calculator icon

Slope Calculator

John Lein · Productivity

SLOPE - PROFESSIONAL GRADE CALCULATIONS FOR SURVEYORS, ENGINEERS & CONTRACTORS

$9.99 · In-app purchases

PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
1 ratings · Top 5%

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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What's included18 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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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 Slope Calculator: map the core Productivity 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

Add features like graphing slope or advanced statistics.

Assumption to check: Limited functionality with only basic slope calculations

Validate with people who use this workflow before building.

Hypothesis 2

Implement cloud sync for saving calculations.

Assumption to check: No cloud backup for history

Validate with people who use this workflow before building.

Hypothesis 3

Allow users to customize units or themes.

Assumption to check: Lack of user customization options

Validate with people who use this workflow before building.

Hypothesis 4

Implement validation and user feedback on inputs.

Assumption to check: No user feedback or error handling

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

SLOPE - PROFESSIONAL GRADE CALCULATIONS FOR SURVEYORS, ENGINEERS & CONTRACTORS Slope 5.0 represents a complete ground-up rebuild of the app trusted by thousands of professionals. Built entirely with modern SwiftUI and powered by iCloud, Slope delivers lightning-fast slope, elevation, and distance calculations right at your fingertips. THREE POWERFUL CALCULATORS IN ONE APP Slope Calculator Input Point A elevation, Point B elevation, and horizontal distance to instantly calculate elevation difference, slope as a decimal, and slope as a percentage. Perfect for grading plans, site analysis, and verifying field measurements. Elevation Calculator Enter slope percentage, horizontal distance, and starting elevation to determine elevation difference and true elevations in both positive (upward) and negative (downward) directions. Ideal for planning drainage, roads, and accessibility ramps. Distance Calculator Input slope percentage and elevation change to calculate the horizontal distance required. Essential for estimating project scope and material quantities. MODERN FEATURES DESIGNED FOR THE FIELD iCloud Sync Across All Your Devices Your projects, calculations, and field notes automatically sync across your iPhone and iPad through iCloud. Start measurements on site with your iPhone and review them later on your iPad in the office - your data is always up to date. Organize by Project Create unlimited projects to keep calculations organized by job site, client, or phase. Each project maintains its own set of calculations and field notes, making it easy to reference past work or generate reports. Field Notes & Shot Naming Save important calculations with custom names and notes. Label each shot for easy reference later - "Property Corner NW," "Driveway Grade," "Foundation Elevation" - whatever helps you stay organized. Visual Diagrams Every calculator includes color-coded visual diagrams that update in real-time as you enter data. See the slope relationship between points graphically, making it easier to communicate with clients and crew members. Imperial & Metric Units Switch instantly between feet and meters with a single tap. All calculations and saved data automatically convert, so you can work with whatever unit system your project requires. Real-Time Calculation Results update instantly as you type - no need to tap a calculate button. The faster workflow means more measurements in less time. Precision When You Need It All results display with 3 decimal places using locale-aware number formatting. Whether you're working to tenths or thousandths, Slope delivers the precision your work demands. BUILT FOR PROFESSIONALS Slope 5.0 is specifically designed for surveyors, civil engineers, landscape architects, grading contractors, and construction professionals who need accurate slope calculations on demand. The intuitive interface means less time fumbling with a calculator and more time getting work done. WHAT MAKES VERSION 5.0 SPECIAL This isn't an update - it's a complete rewrite. Every line of code was reimagined using Apple's latest technologies including SwiftUI, SwiftData, and CloudKit. The result is an app that's faster, more reliable, and more powerful than ever before. UNIVERSAL APP One purchase works on both iPhone and iPad with interfaces optimized for each device size. Use your iPhone in the field and your iPad in the office - all with the same app. NO SUBSCRIPTION REQUIRED Pay once and own it forever. No monthly fees, no feature limitations, no ads. Professional tools at a one-time price. WHAT USERS SAY Professionals rely on Slope every day for accurate, fast calculations. Whether you're checking grades, verifying survey shots, or planning drainage, Slope delivers the results you need when you need them. Download Slope 5.0 and experience the most advanced slope calculation app ever built for iOS. Your projects deserve professional-grade tools.

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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.

SUGGESTED BUILD STACK
React Native
Expo
Redux
React Navigation
React Native Paper
BUILD KIT DIFFICULTY
Starter

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.