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
1-800 Contacts
The 1-800 Contacts app is for people who want to check “renew my contact lens prescription” and “order contacts” off their list quickly! We see you
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
143,182 ratings · Top 5%
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 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 1-800 Contacts: map the core Medical 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 in-app chat support for better user assistance.
Assumption to check: Limited customer support options
Validate with people who use this workflow before building.
Hypothesis 2
Optimize images for faster loading and a smoother experience.
Assumption to check: Slow loading times for images
Validate with people who use this workflow before building.
Hypothesis 3
Create a guided onboarding experience to help users navigate the app better.
Assumption to check: Difficult navigation for new users
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed descriptions and reviews for each product.
Assumption to check: Limited product information
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 1-800 Contacts app is for people who want to check “renew my contact lens prescription” and “order contacts” off their list quickly! We see you. We’re here for you. Let’s do this. - Access the largest in-stock inventory of contact lenses anywhere. If your doctor prescribed it, we carry it (and sell it for less). - Simple ordering: scan your contact lens box or search for your brand - Get your contacts fast with next business-day shipping - Expired contact lens prescription? Renew it with our 10-minute in-app vision exam, ExpressExam. - Save even more with your vision insurance benefits. Look up your benefits and apply them at checkout. We carry the exact contact lenses your doctor prescribes, such as Acuvue Oasys, Biofinity, AirOptix, Precision1, but make it easier, faster, and cheaper to get them. Plus, if you just need to renew your existing contact lens prescription, you can skip the trip to the doctor's office for a full eye exam and instead take our vision exam from home. Same prescription. Better experience.™ Other perks of ordering from the 1-800 Contacts app: - Free shipping, returns, and exchanges - Tear a lens? We’ll replace it. - Really good 24/7 customer service from real, nice humans - Our adorable eyeball mascot - On vacation? Forget your contacts? We’ll ship to your hotel. - Pay with Apple Pay
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
Zustand
axios
@react-navigation/native
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.
