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
Auto Sync for Fitbit to Health
Fitbit + Apple Health + Auto Sync
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
145 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.
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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 included18 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 Auto Sync for Fitbit to Health: 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 more robust error handling and logging.
Assumption to check: Users report issues with unreliable sync between devices.
Validate with people who use this workflow before building.
Hypothesis 2
Provide clearer information on subscription tiers and benefits.
Assumption to check: Subscription model can be confusing.
Validate with people who use this workflow before building.
Hypothesis 3
Expand support for additional fitness devices.
Assumption to check: Limited device compatibility.
Validate with people who use this workflow before building.
Hypothesis 4
Add features for tracking long-term health trends.
Assumption to check: Lack of detailed analytics or insights.
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
Fitbit + Apple Health + Auto Sync - Sync all your Fitbit data to Apple Health - Auto Sync data for you, everyday - Show sync history - Sync Heart Rate data - **Note** Fitbit provides access to daily data only; we're working with Fitbit to support intraday syncing We believe that your Fitbit data belongs to you, and syncing your own data to Apple Health should be Automagical. So we created Power Sync. Data types supported: - Heart Rate - Steps - Walking + Running Distance - Flights Climbed - Weight - Body Fat Percentage - Body Mass Index - Sleep Analysis (in bed and asleep time) - Water - Dietary Calories Notes: - Fitbit provides access to daily data only; we're working with Fitbit to support intraday syncing - Since we don't have intraday data as of now, we're syncing all the data to 12:00 in a day - This is a 3rd party app; it is not a 1st party app from Fitbit Acknowledgement: - Vicons Design from the Noun Project
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
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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.
