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
Swim Converter
Swim Converter is a fast and simple way to convert your swimming times
$0.99 · In-app purchases
PRICE
$0.99
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.
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included16 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 Swim Converter: map the core Sports 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 more metrics and formats.
Assumption to check: Limited conversion options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to save favorite conversions.
Assumption to check: Lack of user customization features.
Validate with people who use this workflow before building.
Hypothesis 3
Add options to share conversions on social media.
Assumption to check: No social sharing features.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance UI with better graphics and animations.
Assumption to check: Minimal visual design and UI appeal.
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
Swim Converter is a fast and simple way to convert your swimming times. It auto-updates in real time and is very fast and easy to use, so you don’t miss your next race! It has an extremely easy input with no number wheel and converts to all 3 pools at once. No internet connection required (except for twitter/facebook posting), which is very helpful since many aquatic centers do not have wireless available. Supports: • Short Course Yards (SCY), Short Course Meters (SCM), Long Course Meters (LCM) • Male and Female • 25, 50, 100, 200, 400/500, 800/1000, 1500/1650 Freestyle • 25, 50, 100, 200 Backstroke • 25, 50, 100, 200 Breaststroke • 25, 50, 100, 200 Butterfly • 100, 200, 400 IM • 200, 400, 800 Free Relay • 200, 400 Medley Relay • B, BB, A, AA, AAA, AAAA Time Standards • Smart input interprets times such as 0:65.23 as 1:05.23, and treats blank cells as zeros • Portrait and landscape modes • Number pad for iPad • Post times anywhere • US and UK time conversions • Show splits by 50 or 100 Written by a swimmer
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
React Navigation
Zustand
Axios
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.
