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
ChatGPT
Introducing ChatGPT for iOS: OpenAI’s latest advancements at your fingertips.
Free · In-app purchases
OVERALL US RANK
#1
Grossing · all categories
REVENUE (Est)
$9.0M/mo
$5.4M - $13M
RATING
★ 4.8
10,441,493 ratings · Top 5%
Evidence scope: #1 is the current overall US Grossing chart position. 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 included19 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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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 ChatGPT: map the core Productivity 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
Allow users to categorize or tag conversations.
Assumption to check: Limited customization options for conversation history
Validate with people who use this workflow before building.
Hypothesis 2
Implement a loading indicator or progress bar.
Assumption to check: Occasional AI response delays
Validate with people who use this workflow before building.
Hypothesis 3
Add a search feature for favorites.
Assumption to check: Difficulty in finding saved messages
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer explanations of benefits for subscription tiers.
Assumption to check: In-app purchase clarity
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
Introducing ChatGPT for iOS: OpenAI’s latest advancements at your fingertips. This official app is free, syncs your history across devices, and brings you the latest from OpenAI, including the new image generator. With ChatGPT in your pocket, you’ll find: · Image generation–Generate original images from a description, or transform existing ones with a few simple words. · Advanced Voice Mode–Tap the soundwave icon to have a real-time convo on the go. Settle a dinner table debate, or practice a new language. · Photo upload—Snap or upload a picture to transcribe a handwritten recipe or get info about a landmark. · Creative inspiration—Find custom birthday gift ideas or create a personalized greeting card. · Tailored advice—Talk through a tough situation, ask for a detailed travel itinerary, or get help crafting the perfect response. · Personalized learning—Explain electricity to a dinosaur-loving kid or easily brush up yourself on a historic event. · Professional input—Brainstorm marketing copy or map out a business plan. · Instant answers—Get recipe suggestions when you only have a few ingredients. Join hundreds of millions of users and try the app captivating the world. Download ChatGPT today. Terms of service & privacy policy: https://openai.com/policies/terms-of-use https://openai.com/policies/privacy-policy
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
Supabase
Zustand
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.
