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
Watt CS: Charging Speed Meter
Stop guessing
$0.99 · In-app purchases
PRICE
$0.99
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 included18 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 Watt CS: Charging Speed Meter: map the core Utilities 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
Implement better algorithms for speed calculation.
Assumption to check: Lack of accurate charging speed measurement
Validate with people who use this workflow before building.
Hypothesis 2
Enhance the history screen with graphs and detailed info.
Assumption to check: Limited historical data display
Validate with people who use this workflow before building.
Hypothesis 3
Add a tutorial to guide first-time users.
Assumption to check: Poor user onboarding experience
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
Stop guessing. Start measuring. Watt CS shows your charger's true output in real time — down to 0.1W — using direct hardware sensor data via the Nitro Library. Plug in and instantly know if you're getting fast charging, or being shortchanged by a cheap cable. — REAL-TIME WATTAGE MONITOR — • Live watts updated continuously with 0.1W precision • Direct hardware sensor access via Nitro Library — not estimated • Dynamic charging ring changes color and icon for Fast or Full states • Professional hardware calibration ensures every reading is accurate — BENCHMARK YOUR CHARGERS — • Run scientific speed tests with custom start and end percentages • Test Apple 20W, Anker, MacBook charger, or any cable side by side • Charger Leaderboard automatically ranks every charger by real efficiency • Know exactly which charger is worth keeping and which to replace — SMART CHARGING HISTORY — • Every session logged automatically: Max Watts, Avg Speed, Total Time • One-tap filters: Fast, Normal, or Slow sessions in one tap • Spot patterns — does your charger slow down at night? History reveals it — UNDERSTAND YOUR BATTERY — • 80% Trickle Detection with visual warning and science-backed explanation • Know why charging intentionally slows after 80% to protect battery health • No more wondering if something is wrong — the app explains it clearly — PREMIUM & PRIVATE — • No ads. No accounts. No internet connection required. • All data stays entirely on your device • Glassmorphism UI, full Dark Mode, animated splash screen • Designed for iPhone and iPad PERFECT FOR: → Testing a new charger before trusting it overnight → Diagnosing why your iPhone charges slowly → Verifying your cable actually supports fast charging → Deciding which charger to pack for a trip Watt CS gives you the data. You make the decision.
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
Supabase
Victory Native
Async Storage
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.
