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
LunarLog: Moon & Mood Tracker
LunarLog is a beautifully simple mood journal that follows the rhythm of the moon.
$5.69 · In-app purchases
PRICE
$5.69
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 LunarLog: Moon & Mood Tracker: map the core Health & Fitness 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
Allow users to create custom moods or tags.
Assumption to check: Limited mood tracking options and customization
Validate with people who use this workflow before building.
Hypothesis 2
Introduce social sharing options for mood entries.
Assumption to check: Lack of social features for sharing progress
Validate with people who use this workflow before building.
Hypothesis 3
Simplify HealthKit integration with a guided setup.
Assumption to check: Difficulties in connecting with HealthKit
Validate with people who use this workflow before building.
Hypothesis 4
Add analytics to visualize mood trends over time.
Assumption to check: No analytics for mood trends
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
LunarLog is a beautifully simple mood journal that follows the rhythm of the moon. Log how you feel each day, then watch your moods line up against the lunar cycle — and find out whether the moon really moves you. DAILY MOOD JOURNAL - Log your mood in seconds on a clean 1–5 scale - Add a diary note - Track your sleep alongside each day's mood A CALENDAR THAT FOLLOWS THE MOON - Every day shows its real moon phase - Tap any day to add or edit an entry - A living nebula dial brings the current phase to life SEE YOUR PATTERNS - Mood by moon sign — which signs lift you and which weigh you down - Your mood mapped at a glance - The more you log, the clearer the patterns become PRIVATE BY DESIGN - Your entries stay on your device and sync through your own private iCloud - No account, no ads, no tracking — ever - Optional: connect Apple Health to see your step count beside your moods (read-only) iCloud keeps your journal with you on every device. Start free. Begin tonight — see where the moon takes you.
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 Navigation
Async Storage
Axios
Expo Image Picker
HealthKit Integration
TypeScript
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.
