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
Fixed Income Bonds Simplified
Transform your fixed income analysis with professional-grade bond calculations in a stunning, redesigned interface
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
4 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.
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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 included17 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 Fixed Income Bonds Simplified: 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
Include advanced features like market analysis and alerts.
Assumption to check: Limited functionality for complex bond tracking
Validate with people who use this workflow before building.
Hypothesis 2
Implement bank linking for real-time updates.
Assumption to check: No integration with external financial accounts
Validate with people who use this workflow before building.
Hypothesis 3
Add tutorials and FAQs to guide beginners.
Assumption to check: Lack of educational resources on bonds
Validate with people who use this workflow before building.
Hypothesis 4
Implement a tiered pricing model to attract more users.
Assumption to check: High subscription cost for premium features
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
Transform your fixed income analysis with professional-grade bond calculations in a stunning, redesigned interface. Bonds: Simplified delivers quality analytics directly to your iPhone, avoiding expensive services. COMPLETELY REDESIGNED EXPERIENCE • Beautiful, modern interface built with Apple's latest design principles • Intuitive navigation with enhanced visual clarity • Streamlined workflows that make complex calculations accessible • All your favorite features improved and easier to use ADVANCED MBS ANALYTICS Get insight into mortgage-backed securities that usually cost a lot more: • Comprehensive MBS parameter configuration with instant calculation results • Input pricing and see spreads and key performance metrics • Side-by-side prepayment sensitivity tables supporting both PSA and CPR methodologies • Prepayment modeling with sensitivity ranging from -300 to +300 basis points • Dynamic rate shock analysis comparing baseline speeds across interest rate environments • Horizon yield curve interpolation with customizable time horizons and rate movements • Rich graphical representations of periodic balances and projected income streams • Detailed amortization schedules showing scheduled principal, unscheduled principal, and period-by-period prepayment speeds ACCESSIBLE MARKET DATA • Pull US Treasury yield curve updates through modern API for accurate spread analysis • Seamless integration of current market rates into your calculations • Historical rate tracking for trend analysis • Change heat map over dynamic dates COMPREHENSIVE BOND TOOLS • New! Fixed-rate bullet bond calculator for traditional bond analysis • Multi-scenario comparison capabilities • Stress-scenario analysis across various rate environments EDUCATIONAL RESOURCES Understanding the mechanics behind fixed income valuation is crucial. Bonds: Simplified not only performs the calculations but helps you understand the underlying assumptions and methodologies, making you a more informed analyst. Includes an interactive learning library built around hands-on education. PERFECT FOR: • Fixed income analysts and portfolio managers • Financial advisors working with bond portfolios • Real estate professionals analyzing mortgage securities • Students and professionals learning fixed income markets • Anyone requiring professional bond analytics without institutional costs Bonds: Simplified democratizes professional fixed income analysis with the reliability and accuracy you demand. Important: All calculations and valuations are estimates for analytical purposes and should not be relied upon for actual investment transactions. Please consult with qualified financial professionals for investment decisions.
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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
Victory Native
React Navigation
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.
