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
FlatSixDynamics
Discover why a flat-six sports car feels the way it does.
$2.99 · In-app purchases
PRICE
$2.99
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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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.
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 FlatSixDynamics: 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
Integrate comprehensive analytics and visualizations.
Assumption to check: Limited performance analysis features
Validate with people who use this workflow before building.
Hypothesis 2
Implement gamification elements to encourage usage.
Assumption to check: User engagement difficulties
Validate with people who use this workflow before building.
Hypothesis 3
Add capabilities to share achievements on social media.
Assumption to check: Lack of social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Create forums or chat for users to discuss strategies.
Assumption to check: No community features
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
Discover why a flat-six sports car feels the way it does. You know the pull when the revs climb. You know the way the body settles as the speed builds. FlatSixDynamics finally lets you see what's happening — the invisible air that shapes every fast car, alive and moving in your hand. No forms to fill in. No numbers to learn. Just drag the speed and watch. — Understand drag. See the wall of air a car pushes through, and watch it grow wilder the faster you go. — Discover downforce. Raise the rear spoiler and watch the air respond — the reason it's there, made visible at last. — Explore the physics of speed. From a standstill to 400 km/h with one finger, the airflow tearing faster the harder you push. — Learn how performance evolves. See why pushing past 250 km/h asks so much more of a car — and why the last few km/h cost the most. This is the question every enthusiast has asked: why does it need the spoiler? Why does it drink fuel at speed? Why does going faster get so hard so quickly? FlatSixDynamics answers them the only way that truly lands — by letting you see it. Beautiful, living airflow. Flowing lines, heat-mapped color, a wake that ripples behind the car like the real thing. Leave it running just because it looks that good. Want to go deeper? Three guided explorations — a wing, a flowing shape, a narrowing channel — reveal the same forces at work in their purest form. Optional. There when you're curious. Everything runs on your device. No account. No subscription. Yours. Real physics, beautifully simplified — built to be felt and enjoyed, not to replace a workshop or a wind tunnel. No affiliation with any vehicle manufacturer.
Written user reviews are not shown here. Check current App Store reviews >
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
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@react-navigation/native
react-native-chart-kit
Zustand
BUILD KIT DIFFICULTY
Advanced
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.
