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
Informed Delivery® Mobile
The Informed Delivery® Mobile application allows you to start your mornings with a preview of your day’s USPS mail and packages
Free · In-app purchases
OVERALL US RANK
#57
Free · all categories
REVENUE (Est)
$116K/mo
$66K - $166K
RATING
★ 4.9
54,864 ratings · Top 5%
Evidence scope: #57 is the current overall US Free chart position. 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 included17 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 Informed Delivery® Mobile: map the core Business 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
Offer enhanced tracking and notifications for all packages.
Assumption to check: Limited tracking features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation and improve visual hierarchy.
Assumption to check: User interface can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Implement in-app chat support for immediate assistance.
Assumption to check: Slow customer support response times
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to personalize their notification preferences and dashboard layout.
Assumption to check: Lack of customization options
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
The Informed Delivery® Mobile application allows you to start your mornings with a preview of your day’s USPS mail and packages. This free app let's you see photos of your mail before it arrives and receive USPS tracking updates. You can use the app to: • Create your account or sign-in with an existing account. • Get daily digest notifications to preview your mail and packages scheduled to arrive soon. • See grayscale images of your mail before it arrives*. Images are of the exterior, address side only of letter sized mail. • Interact with mailer-provided digital content associated with your mail (e.g. - special offers, related links). • Scan eligible tracking numbers or label barcodes to track the status of your inbound or outbound USPS packages. • Get delivery status updates directly to your smartphone. *Images are only provided for letter-sized mailpieces that are processed through USPS’s automated equipment. Mail and packages may not arrive the same day you get a notification – please allow several days for delivery.
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
React Navigation
TypeScript
Zustand
BUILD KIT DIFFICULTY
Advanced
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.
