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
AirWeight for Bluetooth Scales
AirWeight connects to your Xiaomi Mi Scale or SANITAS SBF70 Bluetooth scale and reads your weight in realtime, computes your body mass index and body fat percentage and saves the measurements in the Health app.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.5
6 ratings · Top 50%
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's included15 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 AirWeight for Bluetooth Scales: 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 better error handling and connection status indicators.
Assumption to check: Limited Bluetooth connectivity options.
Validate with people who use this workflow before building.
Hypothesis 2
Provide comprehensive charts and insights based on user data.
Assumption to check: Lack of detailed analytics for weight history.
Validate with people who use this workflow before building.
Hypothesis 3
Establish a more robust update schedule and user feedback mechanism.
Assumption to check: Infrequent updates and bug fixes.
Validate with people who use this workflow before building.
Hypothesis 4
Add HealthKit and Google Fit integration for better data tracking.
Assumption to check: No integration with other health 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
AirWeight connects to your Xiaomi Mi Scale or SANITAS SBF70 Bluetooth scale and reads your weight in realtime, computes your body mass index and body fat percentage and saves the measurements in the Health app. Supported Scales: • Xiaomi Mi Scale • Xiaomi Mi Scale 2 • Xiaomi Mi Composition Scale • Xiaomi Mi Composition Scale 2 • SANITAS SBF70 Weight Scale AirWeight supports macOS, iOS, iPadOS, watchOS and tvOS. Notes: • AirWeight can save your weight, body mass index, body fat percentage and lean body mass measurements in the Health app. HealthKit support is available on iOS and watchOS. • Computing the body fat percentage and lean body mass is only supported on scales with bio-impedance sensors like the Xiaomi Mi Composition Scale and Xiaomi Mi Composition Scale 2. • Computing the body mass index, body fat percentage and lean body mass requires granting AirWeight access to read the height, biological sex and birthdate from the Health app. • AirWeight can optionally sync past measurements using iCloud so that they can be viewed on devices without HealthKit support, such as a Mac or Apple TV. This feature needs to be enabled in the app settings of each device. At least one device with HealthKit support is required to propagate the measurements to other devices. • AirWeight includes extensive widget support which includes graph and launcher widgets in various sizes that can be added to the home screen and lock screen on iOS / iPadOS, to the notification center in macOS and to the watch-face in watchOS. Privacy by Design: AirWeight works completely on-device and does not store or send any information outside of the protected app sandbox.
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
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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.
