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.
App Overview
Calculator Speed Distance Time
Unlock the power of quick and accurate calculations with the Speed Distance Time Calculator app! Designed for travelers, students, athletes, and anyone on the go, this user-friendly app simplifies how you calculate sp...
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
13 ratings · Top 15%
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
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
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Calculator Speed Distance Time: 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
Expand to include advanced functions such as unit conversion.
Assumption to check: Limited functionality beyond basic calculations
Validate with people who use this workflow before building.
Hypothesis 2
Implement a history feature to save and revisit past calculations.
Assumption to check: No historical record of previous calculations
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize themes or layouts.
Assumption to check: Lack of customization options for users
Validate with people who use this workflow before building.
Hypothesis 4
Include onboarding to explain app features and usage.
Assumption to check: No tutorial or guidance for new users
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
Unlock the power of quick and accurate calculations with the Speed Distance Time Calculator app! Designed for travelers, students, athletes, and anyone on the go, this user-friendly app simplifies how you calculate speed, distance, and time, making it an essential tool for various activities. KEY FEATURES: Versatile Calculations: Easily compute speed, distance, or time with just a few taps. Multiple Units Supported: Switch effortlessly between different units, including: • Speed: mph, km/h, m/s, knots, min/mi, min/km, cm/s, f/min, m/min and more. • Distance: miles, kilometers, meters, feet, and nautical miles. • Time: hours, minutes, seconds, and milliseconds. Ideal for Everyone: Whether you're a runner, a driver planning your trip, or a student learning, this app meets all your calculation needs. User-Friendly Interface: Designed for simplicity, navigate through the app with ease and perform calculations quickly. Why You Need This App. Answer common questions like: • How far did I run? • How long will it take me to get there? • How fast will I travel? Use it for sports training, travel planning, or educational purposes. Download the Speed Distance Time Calculator app today and simplify your calculations! Privacy policy: https://sweeftworx.com/speeddistancetime/privacy-policy.html Terms of Service: https://sweeftworx.com/speeddistancetime/terms-and-conditions.html
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.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
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.
