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
Amazon Flex
Deliver smiles
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
432,687 ratings · Top 15%
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 included17 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Amazon Flex: 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
Implement robust error handling and performance optimization.
Assumption to check: Frequent app crashes during high traffic times.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation flow and include guided onboarding.
Assumption to check: Difficult navigation for new users.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce multi-route management features.
Assumption to check: Limited support for managing multiple delivery routes.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate real-time tracking and notifications.
Assumption to check: Lack of real-time updates on delivery status.
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
Deliver smiles Amazon delivers millions of items each year, delighting customers around the world. We’re investing in getting deliveries to customers faster all the time, and people like you can help make it happen. Grow with Amazon Are you looking for a delivery driving opportunity that provides great pay and a chance to deliver smiles to customers? The Amazon Flex app gives you access to technology that makes delivering packages easy. It’s simple Being a delivery driver is easy with the Amazon Flex app. We’ll guide you every step of the way, from sign up, to making your first delivery, to on-road support. Let's go! If you join us, you can build your own schedule, seven days a week. You can schedule work ahead or accept same-day offers when you have spare time. By downloading the app, you agree to receive communications from Amazon Flex, including emails and push notifications. You can opt out of receiving push notifications through your device settings. By using this app, you agree to Amazon’s Conditions of Use (www.amazon.com/conditionsofuse (http://www.amazon.com/conditionsofuse)) and Privacy Notice (www.amazon.com/privacy (http://www.amazon.com/privacy)). Requirements to Start: Age: You must be 21 or older. Vehicle Type: You need a 4-door, midsize sedan or larger vehicle (such as an SUV). Valid ID: Ensure you have a valid driver's license and a Social Security Number. Insurance: Maintain personal auto insurance that meets your local requirements. Bank Account: You'll need a checking or savings account. Followed by: By downloading the app, you agree to receive communications from Amazon Flex, including emails and push notifications. You can manage push notification preferences in your device settings. *Actual earnings will depend on your location, any tips you receive, how long it takes you to complete your deliveries, and other factors. By using this app, you agree to Amazon’s Conditions of Use (www.amazon.com/conditionsofuse (http://www.amazon.com/conditionsofuse)) and Privacy Notice (www.amazon.com/privacy (http://www.amazon.com/privacy)).
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.
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BUILD KIT DIFFICULTY
Expert
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.
