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
BA Financial Calculator Pro
Full-feature emulates Texas Instruments BA II Plus Professional Financial Calculator for iPhone, iPad, and Apple Watch
$5.99 · In-app purchases
PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
191 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 included17 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 BA Financial Calculator Pro: 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 more financial tools and calculators.
Assumption to check: Limited functionality compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Modernize the design and improve usability.
Assumption to check: User interface feels outdated.
Validate with people who use this workflow before building.
Hypothesis 3
Clarify purchase options and provide a trial period.
Assumption to check: In-app purchase confusion.
Validate with people who use this workflow before building.
Hypothesis 4
Add educational content and tooltips.
Assumption to check: Lack of detailed explanations for calculations.
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
Full-feature emulates Texas Instruments BA II Plus Professional Financial Calculator for iPhone, iPad, and Apple Watch. Built with identical algorithms and formulas of original, it provides exact same capabilities and operation sequences, and beyond with better user experience. Just as the original BA II Plus Professional, this app comes with easier natural input than RPN used by other financial calculator apps, including HP 12C Financial Calculator. **** Features **** • Time Value of Money calculations. • Amortization schedules. • Cash flow analysis, Net Present Value (NPV), and Internal Rate of Return (IRR), Net Future Value (NFV), Payback (PB), Discounted Payback (DPB), Reinvestment Rate (RI), and Modified Internal Rate of Return (MOD). • Mortgage and Loan calculations. • Depreciation with four different methodologies. • Breakeven, Profit, and Percent difference calculations. • Bond prices and yields “to maturity” or “to call” calculations, and Modified Duration (DUR). • Statistical analysis. • 10 Memories for storage. • Choice of Chain and Algebraic Operating System methods. • Scientific capabilities, including log, sin, cos etc. • Options to turn on/off key click feedback sound, and • Easily set number format, angle mode, date format, and so on via in-app settings. • Automatically save/restore all format settings during app close/start. • More ... **** Support **** Please email us at [email protected]. **** Stay tuned for coming updates **** Like us: www.facebook.com/vicinno Follow us: www.twitter.com/vicinno ************************************************************************************** The Differences between BA II PLUS and BA II PLUS PROFESSIONAL ************************************************************************************** The BA II PLUS PROFESSIONAL includes 4 additional Cash Flow worksheet variables and 1 Bond worksheet variable that are not included on the BA II PLUS as listed below. • Net future value (NFV, Compute-only Cash Flow worksheet variable) • Payback - (PB, Compute-only Cash Flow worksheet variable) • Discounted payback (DPB, Compute-only Cash Flow worksheet variable) • Reinvestment rate (RI, Enter-only Cash Flow worksheet variable) • Modified internal rate of return (MOD, Compute-only Cash Flow worksheet variable) • Modified duration (DUR, Auto-compute Bond worksheet variable)
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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.
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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.
