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
SnapCal: AI Calorie Counter
SnapCal is your all-in-one weight management companion — powered by smart calorie tracking and personalized meal planning
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
11,698 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 SnapCal: AI Calorie Counter: 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
Improve the scanning algorithm with better AI training.
Assumption to check: Users report difficulty accurately scanning food items
Validate with people who use this workflow before building.
Hypothesis 2
Provide clearer information on subscription benefits and trials.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Integrate a comprehensive food database API for better food recognition.
Assumption to check: Limited food database for logging
Validate with people who use this workflow before building.
Hypothesis 4
Focus on optimizing camera handling and error management.
Assumption to check: Occasional crashes during scanning
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
SnapCal is your all-in-one weight management companion — powered by smart calorie tracking and personalized meal planning. Just snap, log, and reach your goals with ease. Whether you're looking to lose weight, maintain it, or simply build healthier habits, SnapCal guides you every step of the way. Using science-backed calorie tracking, AI-powered food recognition, and intuitive tools, SnapCal makes wellness simple — and sustainable. Why SnapCal: - Snap & Track Meals in Seconds Just take a photo to log your meal — it's that simple. No more tedious input! - Personalized Calorie Goals Enter your info and goal weight — we'll calculate a daily calorie budget tailored just for you. - Smarter Food Logging Track meals by photo, barcode, or search — powered by AI for fast, accurate results. - Beyond Calories: Track What Matters Monitor your macros, water, sugar, body measurements, and more — all in one place. - Visual Weight Progress Tracker See your transformation unfold with clear, motivating charts. - Healthy Plans for Every Stage Whether you're a beginner or experienced, customize your plan and pace — SnapCal adapts to you. - Daily Reminders & Friendly Nudges Stay consistent and motivated with smart, timely encouragement. Built on Balance, Backed by Science SnapCal promotes realistic, effective weight loss through a combination of smart calorie tracking, balanced eating, and moderate activity. We don't do crash diets — we help you build habits that last. App Features at a Glance: - Snap It Photo Meal Logging – Just tap the camera icon for food tracking and calorie counting in a snap - Barcode Scanning & AI Food Recognition – Fast, easy, accurate food entry - Custom Calorie Recommendations – Based on your body and weight goals - Track Nutrition & More – Macros, water, carbs, sugar, body stats - Weight Progress Tracker – Visualize your results - Healthy Weight Plans – Personalized routines for every user - Apple Health Integration – Sync your activity automatically Please Note: Healthy weight loss requires a balanced diet and physical activity. For best results, consult your doctor before beginning any new fitness program. Individual outcomes may vary. Subscription Info: Should you choose to purchase a Premium or Boost subscription, subscription purchase will be charged to your iTunes account. The yearly subscription will automatically renew unless the auto-renew is turned off at least 24 hours before the period subscription ends. Your premium subscription auto-renew can be turned off or managed in your iTunes account settings. Any unused portion of the free trial is forfeited after purchase. Terms of Use: https://snapcal.co/terms Privacy policy: https://snapcal.co/privacy If you have any questions or suggestions, email us at: [email protected]
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
Zustand
Firebase
react-navigation
@react-native-async-storage/async-storage
BUILD KIT DIFFICULTY
Advanced
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.
