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
MoodLens: Emotion Tracker
MoodLens is the world's first AI mood journal that understands your emotions through facial micro-expressions — entirely on your device
$2.99 · In-app purchases
PRICE
$2.99
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 MoodLens: Emotion 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
Include reminders and notifications to prompt users to log their mood.
Assumption to check: Difficulty in tracking emotions consistently over time
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to add personalized tags and notes to their mood entries.
Assumption to check: Limited customization of mood entries
Validate with people who use this workflow before building.
Hypothesis 3
Integrate social features to enable sharing insights and challenges with friends.
Assumption to check: Lack of social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Provide deeper analytics and insights on mood patterns and triggers.
Assumption to check: Overly simplistic mood tracking
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
MoodLens is the world's first AI mood journal that understands your emotions through facial micro-expressions — entirely on your device. No cloud. No accounts. No data ever leaves your phone. HOW IT WORKS Just open the app, face your camera, and tap capture. In under 10 seconds, MoodLens analyzes subtle facial cues — eye crinkles, lip curls, brow movements — using the science of FACS (Facial Action Coding System) to reveal your true emotional state. FEATURES 10-Second Mood Capture One tap. One glance. Your mood is captured and analyzed instantly using on-device AI. No typing, no prompts, no effort. Micro-Expression AI Detects 20 facial action units and maps them to 10 emotions: joy, sadness, anger, surprise, fear, disgust, calm, stress, focus, and fatigue. Powered by a neural network running directly on your device. Emotion Reports See your emotional patterns over days, weeks, and months. Beautiful charts show your emotion breakdown, dominant moods, and how your feelings shift over time. Pattern Detection MoodLens automatically discovers patterns in your emotional life. Are you happiest on Wednesday mornings? Does stress spike after 3 PM? The app finds insights you'd never notice on your
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
Victory Native
Zustand
React Navigation
Firebase
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.
