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
Digital Barometer-Air pressure
Digital Barometer is a free app that allows you to easily check air pressure and altitude using the pressure sensor in your device in a simple yet sophisticated user interface.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
8 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/
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 Digital Barometer-Air pressure: map the core Weather 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
Provide more detailed analytics and historical trends.
Assumption to check: Limited historical data compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate alerts for significant pressure changes or weather warnings.
Assumption to check: No severe weather alerts
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the UI with animations and interactive elements.
Assumption to check: Basic UI lacks engagement
Validate with people who use this workflow before building.
Hypothesis 4
Improve visibility of premium features and their benefits.
Assumption to check: In-app purchase not clearly communicated
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
Digital Barometer is a free app that allows you to easily check air pressure and altitude using the pressure sensor in your device in a simple yet sophisticated user interface. It also supports providing air pressure forecasts and has an automatic history feature, so you can get all the air pressure information related to the present, future and past in this app. - Barometer - Atmospheric pressure - Supported measurement units: bar, inHg, mmHg, Torr, kPa, hPa, etc. - Historical analysis - Altimeter - Real-time altimeter - Real-time barometer - Absolute altitude - Relative altitude - GPS altitude - Air pressure forecast - Up to 30 days Measurement units You can easily choose to see the atmospheric pressure measured in the following locations: • Millibar (mBar) • Inches of Mercury (inHg) • Millimeters of Mercury (mmHg) • Hectopascals (hPa) • Kilopascals (kPa) • Torr (torr) Support If you like the app, please don't forget to leave us a review on the App Store. terms of use:https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
axios
chart.js
@react-native-community/push-notification
react-navigation
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.
