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
SlalomCam
SlalomCam is an iPhone camera app designed specifically for filming slalom waterskiing from the boat.
$5.99 · In-app purchases
PRICE
$5.99
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 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 SlalomCam: 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
Include social sharing and community feedback options.
Assumption to check: Limited user engagement due to a lack of community features.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a free trial and freemium model to attract users.
Assumption to check: High barrier to entry with upfront payment and no trial options.
Validate with people who use this workflow before building.
Hypothesis 3
Offer premium analysis tools and detailed performance metrics.
Assumption to check: Inadequate analysis features that may not meet advanced user needs.
Validate with people who use this workflow before building.
Hypothesis 4
Add integrations for broader fitness tracking capabilities.
Assumption to check: No integration with external fitness apps or devices.
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
SlalomCam is an iPhone camera app designed specifically for filming slalom waterskiing from the boat. Set your preferred trigger speed and SlalomCam automatically starts recording as the boat reaches that speed, then stops when the boat slows down again. No need for someone in the boat to constantly operate the camera. AUTOMATIC RECORDING Using the iPhone’s GPS speed, SlalomCam automatically starts and stops recording during a ski set. Choose your trigger speed in either km/h or mph and SlalomCam takes care of the recording. AUTOMATIC SKIER FOCUS SlalomCam uses Apple Vision to automatically detect the skier before the pass. The camera focuses on the skier and holds focus steady during recording, helping prevent spray, wake and background movement from pulling focus away. ADVANCED STABILISATION Choose from: • Standard • Pro Wide • Pro Ultra Wide Pro modes use the strongest compatible stabilisation available for the selected iPhone camera, resolution and frame rate. SlalomCam 4.0 further improves Pro stabilisation and camera exposure behaviour for smoother footage and better motion clarity during high-speed skiing. VIDEO MODES • 720p at 60 fps • 1080p at 60 fps • 4K at 30 fps • 4K at 60 fps Available combinations depend on the camera hardware in your iPhone. PASS INFORMATION OVERLAY Optionally add skier information directly to the saved video, including: • Requested ski speed • Rope length / line length Supported rope lengths range from 18.25 m / 15 off through to 9.75 m / 43 off. The displayed requested speed is manually selected pass information and is not a measurement of actual boat speed. BUILT FOR THE BOAT • Automatic landscape operation • Pinch-to-zoom with live zoom display • Front and rear camera support • Automatic skier focus • GPS speed-triggered recording • Microphone audio recording • Automatic saving to Photos • Improved reliability across repeated ski passes Mount the phone, select your settings and let SlalomCam handle the recording.
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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
Supabase
react-navigation
expo-camera
@supabase/supabase-js
BUILD KIT DIFFICULTY
Intermediate
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.
