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
IBKR Mobile - Invest Worldwide
An intuitive, ergonomic mobile trading platform
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
10,987 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/
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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 IBKR Mobile - Invest Worldwide: map the core Finance 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 data caching and optimize API calls.
Assumption to check: Users often find the app slow to load data
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation and enhance onboarding.
Assumption to check: Complicated navigation can confuse new users
Validate with people who use this workflow before building.
Hypothesis 3
Add tutorials and guides within the app.
Assumption to check: Limited educational resources for beginner investors
Validate with people who use this workflow before building.
Hypothesis 4
Establish a unified design system for visual consistency.
Assumption to check: Inconsistent user interface across screens
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
An intuitive, ergonomic mobile trading platform. Monitor market activity and trade with real-time quotes, charts, and market scanners. Both standard order types and complex option spreads are supported. Thinking about opening an account at IBKR? Take our mobile platform for a test drive: no registration or username is required to log in and view unlimited delayed quotes. DISCLOSURES INVESTING IN FINANCIAL PRODUCTS INVOLVES RISK TO YOUR CAPITAL. YOUR INVESTMENTS MAY INCREASE OR DECREASE IN VALUE, AND LOSSES IN DERIVATIVES OR WHEN TRADING ON MARGIN MAY EXCEED THE VALUE OF YOUR ORIGINAL INVESTMENT. IBKR’s services are offered through the following companies, depending on your location: • Interactive Brokers LLC • Interactive Brokers Canada Inc. • Interactive Brokers Ireland Limited • Interactive Brokers Central Europe Zrt. • Interactive Brokers Australia Pty. Ltd. • Interactive Brokers Hong Kong Limited • Interactive Brokers India Pvt. Ltd. • Interactive Brokers Securities Japan Inc. • Interactive Brokers Singapore Pte. Ltd. • Interactive Brokers (U.K.) Ltd. Each of these IBKR companies is regulated as an investment broker in its local jurisdiction. Each company’s regulatory status is discussed on its website. Interactive Brokers LLC is a SIPC member. *Lowest Cost Broker according to StockBrokers.com Online Broker Survey 2022.
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
React Navigation
Axios
React Query
Async Storage
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.
