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
Calorie Counter - EasyFit Pro
EasyFit calorie counter tracks your food, exercises, weight loss progress and macros.
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
233 ratings · Top 30%
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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 Calorie Counter - EasyFit Pro: 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
Implement a more intuitive food search and barcode scanner.
Assumption to check: Difficult food entry process can frustrate users.
Validate with people who use this workflow before building.
Hypothesis 2
Add HealthKit and Google Fit integration for seamless tracking.
Assumption to check: Limited integration with other fitness apps.
Validate with people who use this workflow before building.
Hypothesis 3
Focus on regular updates and user feedback for bug fixes.
Assumption to check: Inconsistent updates and bugs reported by users.
Validate with people who use this workflow before building.
Hypothesis 4
Provide a free tier with core features to attract more users.
Assumption to check: Subscription model may deter long-term users.
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
EasyFit calorie counter tracks your food, exercises, weight loss progress and macros. See animated statistics, make your own food and achieve all your fitness goal. Use Easy Fit to lose weight, gain muscles or simply improve your fitness. ----- Very Effective ----- - No hundreds of lists of same food. Just pick the food and add it. All calorie estimation are carefully calculated and very well tested to produce great results. - Search function for all the foods and exercises is integrated. - Create your own food in addition to +1500 default foods and let EasyFit calculate the total calories and macros automatically. ----- 100% Privacy ----- - NO shady permissions. NO data collecting/selling like your contacts or location. Everything is saved locally. Your privacy is guaranteed! ----- Statistics ----- -Many animated & zoomable statistics about your calories, exercise time, macros and weight loss. - Set your custom daily macro percentages that you would like to achieve. ----- Personalisation ----- - This food diary has 42 beautiful themes to choose from and put your own feel in this beautiful and originally designed app. ----- Website ----- http://www.easyfit-caloriecounter.de ----- Note from Developer ----- Please write an email about any opinion/wish you have. I gladly communicate with my users :) Email: [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
axios
react-navigation
react-native-chart-kit
@react-native-async-storage
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.
