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
Fast Tract Diet
Fast Tract Diet App helps you identify gut friendly foods versus hard-to-digest foods, track and chart your meals and symptoms, create shopping lists and quickly look up symptom potential for specific foods & drinks a...
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.4
63 ratings · Below Average
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
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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 Fast Tract Diet: 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
Enhance database with user-generated content and more food items.
Assumption to check: Limited food database compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Improve UI to be more modern and visually appealing.
Assumption to check: User interface feels outdated
Validate with people who use this workflow before building.
Hypothesis 3
Simplify subscription options and clarify benefits.
Assumption to check: Subscription model can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with HealthKit/Google Fit for better tracking.
Assumption to check: Lack of integration with fitness apps
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
Fast Tract Diet App helps you identify gut friendly foods versus hard-to-digest foods, track and chart your meals and symptoms, create shopping lists and quickly look up symptom potential for specific foods & drinks at your favorite market on the fly. Fast Tract Diet is based on a flexible “FP” point system adaptable to a variety of dietary preferences. Each food is assigned a specific point value based on its symptom potential; the lower the points, the lower the symptom potential. Fast Tract Diet addresses the symptoms of Functional Gastrointestinal Disorders and Small Intestinal Bacterial Overgrowth (SIBO) and related digestive and general health issues including: • Gas, bloating, distension and belching • Cramps, abdominal pain and indigestion • Diarrhea, constipation or altered bowel habits • Heartburn, sore throat, sinus irritation, persistent cough, sour taste, hoarseness, lump in throat feeling and post nasal drip • Respiratory symptoms • Allergic and autoimmune reactions Credits for various Icons - https://icons8.com/ - http://www.flaticon.com/ Icons made by Freepik from www.flaticon.com Icon made by Picol from www.flaticon.com
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
React Navigation
Zustand
Axios
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.
