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
G FORCE
G FORCE makes your iPhone or iPod Touch a handy vehicle G-Force meter
$2.99 · In-app purchases
PRICE
$2.99
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 included16 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 G FORCE: 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 sharing features to social media platforms.
Assumption to check: Limited social sharing options for performance data
Validate with people who use this workflow before building.
Hypothesis 2
Provide users with customizable metrics and performance charts.
Assumption to check: Lack of customization options for metrics displayed
Validate with people who use this workflow before building.
Hypothesis 3
Create a community section for users to share tips and experiences.
Assumption to check: No community features for user interaction
Validate with people who use this workflow before building.
Hypothesis 4
Introduce badges and challenges to encourage user engagement.
Assumption to check: Absence of gamification elements to motivate 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
G FORCE makes your iPhone or iPod Touch a handy vehicle G-Force meter. A nice looking enhancement to the dash of your car, too. Quantify the G-Force you experience in the vehicle (e.g. during acceleration, braking, drifting, cornering etc) or perform a quick dyno. Its unique "Sound Alert feature" provides alert sound when the g-value exceeded a user selected limit. FEATURES (1) "Quick & Simple Calibration" Simply press the start button and G FORCE takes only about 0.5 seconds to calibrate to your iPhone's tilt angle. (2) "Real Time Display" Two "Linear Gauges" and two "Digital Displays" show the real time lateral (e.g. cornering) and longitudinal (acceleration, braking) G values. (3) "Peak Hold" Adjustable "Peak Hold Duration" helps you monitor peak values. (4) "Graphical Peak Hold Indicators" Distinctive graphical peak hold indicator makes observing peak values a quick glance. (5) "Adjustable Audio Alert" Provides alert sound when the G-Forces exceeded a user preset "threshold". (6) "Adjustable Gauge Scale" "log Scale" and "Linear Scale" helps you utilize the "Linear Gauges" for different conditions. e.g. Use log Scale in "mild" acceleration conditions or use "Linear Scale" in "aggressive" acceleration conditions. (7) "Session Maximum Records" Shows all the maximum G values in the current session. (8) "Large Operation Buttons" Facilitates quick and easy operation. (9) "Theme Switch" Switch between the Classic and Graphite Theme to suit your taste. With its nice interface and unique features, you would like G FORCE even though you may have already got other g-meters like dynolicious or even a hardware equipment.
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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.
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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.
