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
Water Temperature
The Water Temperature app is designed to help you monitor and record water temperatures using your Apple Watch
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.8
6 ratings · Top 50%
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Water Temperature: 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
Add features like temperature history analysis and trends.
Assumption to check: Limited functionality for advanced users
Validate with people who use this workflow before building.
Hypothesis 2
Ensure accurate conversion between Celsius and Fahrenheit.
Assumption to check: Inconsistent unit conversions
Validate with people who use this workflow before building.
Hypothesis 3
Enable users to share temperature results easily.
Assumption to check: No sharing options for readings
Validate with people who use this workflow before building.
Hypothesis 4
Provide visual feedback, such as alerts or graphs, for measured temperatures.
Assumption to check: Lack of user feedback on measurements
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
The Water Temperature app is designed to help you monitor and record water temperatures using your Apple Watch. This app is perfect for surfers, swimmers, ice-bathers, and anyone wants water temperature readings in real-time. Key Features: - Real-Time Temperature Monitoring: Instantly view the current water temperature on your Apple Watch. - Temperature Units: Easily switch between Fahrenheit and Celsius. - Temperature Accuracy: Provides accurate readings with a ± precision. - Session Timer: Track the duration of your water activities with the built-in timer. - Min/Max Temperature Recording: Record and review the minimum and maximum water temperatures during your session. - Latest Reading Display: Always displays the most recent temperature reading and how long ago it was measured when out of the water. - Dive Mode Integration: Easily set up Dive mode using the Action button for quick access during water activities. Usage Instructions: 1. Install the Water Temperature app on your Apple Watch. 2. Enable the app in your settings to start monitoring water temperatures. 3. Switch to the Water Temperature app on your watch to begin recording temperatures. 4. View real-time temperature updates directly on your watch face. 5. Use the session timer to keep track of the duration of your activities. 6. Review the minimum and maximum temperatures recorded during your session. 7. Configure the Action button to quickly launch Dive mode for underwater activities by following the setup instructions in your watch settings. Note: This app is available only on devices with a Depth Gauge and Water Temperature Sensor. See Measure underwater temperature, duration, and depth on Apple Watch for more information: https://support.apple.com/guide/watch/measure-underwater-temperature-duration-depth-apd9073c83d6/watchos WARNING: Underwater activities are risky. To reduce the risk of serious or fatal injury, read and follow all instructions and warnings in the Apple Watch Ultra User Guide. THIS APP IS NOT A DIVE COMPUTER AND IS INTENDED FOR SURFACE LEVEL ACTIVITY ONLY. Enhance your water activities with accurate and reliable water temperature monitoring. Download the Water Temperature app now and start tracking!
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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
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.
