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
Fit-Stitch Progress Tracker
Your weight doesn't tell the whole story
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
331 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 included18 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 Fit-Stitch Progress 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Your weight doesn't tell the whole story. You could lose fat and gain muscle and the scale won't budge. That's why photos matter — they show what's actually changing. Fit-Stitch pairs weight tracking with progress photos so you can see the full picture, not just a number. What it does: - Track your weight and take progress photos over time - Tag your snapshots and photos to organize your progress - Create side-by-side comparisons to spot changes you'd otherwise miss - Sync across your devices with iCloud — your data goes to your own private account, never ours - Lock the app with Face ID or Touch ID for extra privacy - Set reminders so you remember to track consistently Your data stays yours. Your photos and data live on your device. No accounts, no ads, no data collection. If you turn on iCloud sync, it goes to your own private iCloud — we never see it. Built by two indie devs, not a corporation. We're responsive, and we actually read our messages. If something's broken or you have an idea, reach out — we'd love to hear from you.
Written user reviews are not shown here. Check current App Store reviews >
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
Integrate social sharing options to enhance user engagement.
Assumption to check: Limited social features for sharing progress
Validate with people who use this workflow before building.
Hypothesis 2
Introduce AI-driven workout suggestions based on user goals.
Assumption to check: Lack of personalized workout recommendations
Validate with people who use this workflow before building.
Hypothesis 3
Add support for syncing with fitness trackers and smartwatches.
Assumption to check: No integration with wearable devices
Validate with people who use this workflow before building.
Hypothesis 4
Offer a compelling free tier to attract more users.
Assumption to check: Subscription model may deter users
Validate with people who use this workflow before building.
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
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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.
