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
Finder for Fitbit
Download the app to quickly and easily find your Fitbit! Over 800,000+ people have done so already!
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
1,170 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 included16 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 Finder for Fitbit: 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 device support and sync reliability
Assumption to check: Limited device compatibility and sync issues
Validate with people who use this workflow before building.
Hypothesis 2
Enhance stability and testing protocols
Assumption to check: Occasional crashes and bugs during data syncing
Validate with people who use this workflow before building.
Hypothesis 3
Integrate social challenges and community features
Assumption to check: Lack of social features or community engagement
Validate with people who use this workflow before building.
Hypothesis 4
Offer flexible trials and clearer value propositions
Assumption to check: Subscription model may deter some 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
Download the app to quickly and easily find your Fitbit! Over 800,000+ people have done so already! Finder for Fitbit allows you to easily find your lost Fitbit around you before the battery runs out. The app itself searches for your Fitbit's wireless radio signature to pick up where your lost Fitbit is and then provides an easy way to guide you to its general location. Supported Fitbit models: Fitbit Charge HR, Fitbit Charge 2, Fitbit Flex, Fitbit Surge*, Fitbit Zip*, Fitbit One, Fitbit Force, Fitbit Blaze, Fitbit Alta, Fitbit Ionic, Fitbit Flex 2, Fitbit Ace, Fitbit Ace 2, Fitbit Charge 3, Fitbit Inspire, Fitbit Inspire HR and Fitbit Versa Designed for use with the FITBIT® platform. Fitbit is a registered trademark and service mark of Fitbit, Inc. Finder for Fitbit Lite & Finder for Fitbit is designed for use with the Fitbit platform. This product is not put out by Fitbit, and Fitbit does not service or warrant the functionality of this product. *These models are not fully supported but will work in some special circumstances.
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
Supabase
Victory Native
Zustand
BUILD KIT DIFFICULTY
Starter
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.
