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
Portillo's
Portillo’s
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 1.8
967 ratings · Below Average
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 Portillo's: map the core Food & Drink 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
Focus on thorough testing and bug fixing before launch
Assumption to check: Poor user ratings due to bugs and crashes
Validate with people who use this workflow before building.
Hypothesis 2
Implement optimized navigation and faster loading components
Assumption to check: Difficult navigation and slow response times
Validate with people who use this workflow before building.
Hypothesis 3
Provide more customization features for user preferences
Assumption to check: Limited customization options for orders
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate attractive loyalty programs and promo codes
Assumption to check: Lack of promotional offers and incentives
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
Portillo’s We're known for our famous Chicago-style hot dogs, Italian beef sandwiches, chopped salad, cheese fries, homemade chocolate cake, and chocolate cake shake. Our Italian beef is slow-roasted for four hours, thinly sliced, and served on freshly baked French bread. Then, it's dipped in hot gravy made with our homemade blend of seasonings that we've been perfecting for 50 years. Haven't tried Portillo's yet? Order an Italian beef, dipped with sweet or hot peppers (add mozzarella if you're feeling cheesy), or a Chicago-style hot dog "dragged through the garden" and you'll see what all the hype is about. Enjoy these features of the Portillo’s app: Free Cake on Your Birthday: Join Portillo’s Perks and get a free slice of our famous Chocolate Cake on your birthday, half birthday, and sign up anniversary! Delivery: Order delivery from your nearby Portillo’s. Track your order. Receive status updates about your order in real time. Easy Ways to Pick Up: There are three easy ways: Inside the Restaurant, Delivery, or Curbside pickup at participating locations. Save your Favorites: Easily save your favorite order and location so you can order quickly and come back again and again. Favorite Portillo’s locations that you order from the most. Customize your Order: Want your Italian beef sandwich dry, cut in half, with hot peppers and mozzarella cheese and gravy on the side? No problem! Simply customize your Portillo’s favorites to get exactly what you want.
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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
Zustand
React Navigation
React Native Reanimated
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.
