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
Sunglow: Tanning, Rayz Tracker
Sunglow - Your Personal Tanning Routine
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
218 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 Sunglow: Tanning, Rayz Tracker: map the core Weather 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
Provide more data on UV index effects for different skin types.
Assumption to check: Lack of detailed UV index information
Validate with people who use this workflow before building.
Hypothesis 2
Add session history and recommendations based on user skin type.
Assumption to check: Limited tracking features
Validate with people who use this workflow before building.
Hypothesis 3
Implement customizable notification settings.
Assumption to check: Notifications can be intrusive
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to share their tanning sessions or UV awareness tips.
Assumption to check: No social sharing options
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
Sunglow - Your Personal Tanning Routine Sunglow helps you achieve the perfect tan with a personalized plan based on your skin type, location, and UV index. Whether you’re going for a subtle glow or a deeper shade, Sunglow gives you safe, effective guidance every step of the way. Features: - Personalized tanning routines based on your skin tone and local UV levels - Smart session timers for front, back, and break times - Daily SPF recommendations for safe tanning - Progress tracker to monitor your tan development - Real-time UV index alerts and weather-based adjustments - Custom reminders so you never miss a session or reapply moment Reach your ideal shade, safely and confidently. Sunglow takes the guesswork out of tanning. TERMS https://coloring-app-todl4.ondigitalocean.app/sunglow/terms PRIVACY https://coloring-app-todl4.ondigitalocean.app/sunglow/privacy
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
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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.
