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
Calculator Air: AI Math Solver
The Best Calculator & AI Math Solver! Solve math problems instantly with the most advanced calculator designed for students, professionals, and anyone who needs quick, accurate answers
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
83,687 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Calculator Air: AI Math Solver: map the core Utilities 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 graphing capabilities and step-by-step solutions.
Assumption to check: Limited features for advanced math functions.
Validate with people who use this workflow before building.
Hypothesis 2
Implement additional validation checks for solutions.
Assumption to check: Occasional inaccuracies in AI results.
Validate with people who use this workflow before building.
Hypothesis 3
Add a 'Favorites' feature to save frequently used equations.
Assumption to check: No option to save favorite calculations.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the UI with a cleaner design and better spacing.
Assumption to check: User interface can feel cluttered.
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
The Best Calculator & AI Math Solver! Solve math problems instantly with the most advanced calculator designed for students, professionals, and anyone who needs quick, accurate answers. With a scientific calculator, a photo math solver, and an AI homework helper, this all-in-one calculator makes problem-solving effortless. Key Features: -Calculator for all math levels from basic arithmetic to advanced calculus. -Advanced scientific calculator with powerful functions and conversions. -Photo math solver, simply snap a picture and let the calculator do the work. -AI homework helper for step-by-step explanations and tutoring. -Multi-functional calculator for iPad, perfect for studying anywhere. -Master algebra, statistics, and more with our smart AI math tutor. -Currency converter and real-time money calculator with a widget for quick conversions. -Learn and upgrade your skills with a calculator that supports complex equations. From solving equations to AI-powered calculations, this calculator is built to handle everything. Whether you need a standard calculator, a scientific calculator, a calculator for iPad, or a quick photo math solution, this app is the ultimate math helper. Download now and experience the power of an AI-driven calculator designed to make math easy for everyone! Choose from different options. Our standard subscription options are: 1-week Subscription - USD4.99 1-month Subscription - USD9.99 1-year Subscription - USD69.99 -------- Subscription payments will be charged to your iTunes account at confirmation of your purchase and upon commencement of each renewal term. The free trial period will automatically renew to a paid subscription. You can cancel in the iTunes settings at least 24-hours before the end of each current subscription period. The cancellation will take effect the day after the last day of the current subscription period, and you will be downgraded to the free service. Any unused portion of a free trial period (if offered) will be forfeited when you purchase a premium subscription during the free trial period. Connect with us through: Facebook: https://www.facebook.com/airappsco Twitter: https://twitter.com/airappsco Instagram: https://www.instagram.com/airappsco Privacy Policy: https://airapps.co/privacy Terms Of Use: https://airapps.co/terms Support: [email protected]
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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
FastAPI
react-navigation
axios
react-native-clipboard
BUILD KIT DIFFICULTY
Advanced
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.
