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
Mint Mobile
Looking to switch wireless carriers and save big? Meet Mint Mobile — the affordable phone plan on the nation’s largest 5G network
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
258,020 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 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 Mint Mobile: map the core Utilities 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
Simplify navigation with clearer labels and fewer options.
Assumption to check: Complicated navigation structure
Validate with people who use this workflow before building.
Hypothesis 2
Optimize data fetching and caching.
Assumption to check: Slow loading times
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to create custom plans.
Assumption to check: Limited customization options for plans
Validate with people who use this workflow before building.
Hypothesis 4
Implement thorough testing and error handling.
Assumption to check: Occasional bugs in user account management
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
Looking to switch wireless carriers and save big? Meet Mint Mobile — the affordable phone plan on the nation’s largest 5G network. Get unlimited talk & text, fast 5G • 4G LTE data, and no contract phone plans starting at just $15/month. Join the millions who’ve already ditched expensive carriers to bring their own phone, keep their number, and cut their wireless bill—without losing coverage or speed. Download the Mint Mobile app to buy a phone plan, activate service instantly, and manage your account anytime, anywhere. Activate your plan: • Switch your phone plan right from the app—no store visit needed • Bring your own phone and keep your existing number • Get premium 5G coverage and start saving in minutes Manage your account: • Check your wireless data usage and account balance • Renew or upgrade your plan in seconds • Refer friends and earn free Mint credit toward your bill Manage your family: • Create a Mint Family to manage multiple lines under one login • Add, renew, or upgrade up to 4 family plans • Pay for all members’ plans and add-ons in one place Whether you’re switching from AT&T, Verizon or another carrier, Mint Mobile makes it easy to switch phone plans, save money, and enjoy reliable wireless with no contracts and no B.S. Save money. Keep your phone. Ditch your carrier. Join the moveMint today. Follow us: https://www.facebook.com/MintMobileWireless/ https://www.instagram.com/mintmobile/ https://twitter.com/mintmobile Learn more at mintmobile.com
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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
Zustand
React Hook Form
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.
