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
Springfield Toys
Springfield Toys is the collector's companion for fans of The Simpsons
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included15 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 Springfield Toys: map the core Lifestyle 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
Add advanced filtering and sorting options
Assumption to check: Limited toy discovery features
Validate with people who use this workflow before building.
Hypothesis 2
Implement sharing options for social media
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to create wishlists or collections
Assumption to check: Lack of user customization options
Validate with people who use this workflow before building.
Hypothesis 4
Add user reviews and ratings for toys
Assumption to check: No user reviews or ratings
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
Springfield Toys is the collector's companion for fans of The Simpsons. Track what you own, build wishlists, browse a community-powered catalog, and connect with other collectors—all from your iPhone. **Browse the catalog** Search and filter thousands of Simpsons collectibles by brand, category, wave, and more. View details, photos, and price trends powered by eBay sold listings. **Manage your collection** Log items you own, add notes, and keep your stash organized. Export your data anytime. **Wishlists** Create multiple wishlists for grails you're hunting. Share public wishlists with friends and fellow collectors. **Community** Follow other collectors, view public profiles, and see activity from people you follow. Control your privacy in settings. **Stay in the loop** Enable push notifications for follows, comments, and other account activity. **One account everywhere** Sign in with Apple, Discord, or email. Your collection syncs with springfieldtoys.com and our other apps. Springfield Toys is a fan community tool for tracking collectibles. We are not affiliated with, endorsed by, or sponsored by the creators or producers of The Simpsons. All trademarks, logos, and images related to "The Simpsons" belong to their respective owners. Questions or feedback? Visit springfieldtoys.com/contact
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
Redux
Firestore
React Navigation
Axios
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.
