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
11C Scientific Calculator
11C Scientific Calculator is the most accurate and precise emulator of the HP 11C RPN scientific programmable calculator available for iPhone and iPod touch
$5.99
PRICE
$5.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
298 ratings · Top 30%
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 included
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
11C Scientific Calculator is the most accurate and precise emulator of the HP 11C RPN scientific programmable calculator available for iPhone and iPod touch. It uses the same RPN (Reverse Polish Notation) entry system and supports the same mathematical functions as the HP 11C Scientific Calculator. **** Features **** • Hyperbolic and inverse hyperbolic trig functions. • Probability (combinations and permutations). • Factorial, absolute, integer & fractional. • % change, and % of total. • Random number generator. • Index register for indirect operations. • User mode to run program labels. • Cumulative statistical analysis & Linear regression. • Hour minute second conversion. • Polar, rectangular conversion. • RPN entry. • Programmable. • In-app manual, quick start help, and in-app support access. • Option to disable/enable key click feedback sound; and • Easily switch between US and EU data format/comma or period as decimal point • Automatically save/restore settings during app close/start. • Click menu key to see more options. • More … *** What People Say About It *** "Miss your old HP 11C RPN scientific calculator? Then give this utility app a try. It mimics the look and feel of that classic number cruncher in every way possible. It uses the same Reverse Polish Notation entry system and supports the same mathematical functions. There’s even an in-app manual that features tutorial videos in case you’ve lost your touch." ---AppAdvice.com "This app supports complex numbers, intense calculations, matrix operations, and many other features that I don't have room to list. " ---AppGratis.com **** Support **** Feel free to contact us if you need any support by visiting www.vicinno.com or simply email us at [email protected]. **** Stay tuned **** Like us: www.facebook.com/vicinno Follow us: www.twitter.com/vicinno
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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.
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
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
