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
Classic BASIC
Classic BASIC is a retro-inspired BASIC programming environment designed for modern devices.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
2 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 included16 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 Classic BASIC: map the core Developer Tools 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
Expand to support more languages like Python or JavaScript.
Assumption to check: Limited programming languages supported
Validate with people who use this workflow before building.
Hypothesis 2
Include tutorials or example codes to aid learning.
Assumption to check: Can be difficult for beginners to learn BASIC
Validate with people who use this workflow before building.
Hypothesis 3
Add real-time collaboration for users to work together.
Assumption to check: No collaboration features
Validate with people who use this workflow before building.
Hypothesis 4
Optimize execution performance for larger snippets.
Assumption to check: Limited performance for larger code snippets
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
Classic BASIC is a retro-inspired BASIC programming environment designed for modern devices. Write line-numbered BASIC programs, run them instantly, save your work, load built-in examples, explore graphics commands, and learn programming with the included guidebook. Classic BASIC preserves the familiar feel of classic home computers while providing a clean, touch-friendly experience for today's users. Features include: • Traditional line-numbered BASIC programming • Built-in program catalog • Classic commands such as LIST, RUN, SAVE, LOAD, NEW, and CATALOG • Graphics commands for drawing lines, circles, boxes, and screen output • Built-in games including Block Drop and Astro Blaster • Touch game keyboard support for interactive games • External keyboard support with ESC and CTRL+C break commands • Display modes including Green, Amber, and DOS-style color • Built-in programming guide • File support for saving and loading your own programs Classic BASIC is designed for beginners, hobbyists, retro-computing enthusiasts, students, and anyone who wants a simple programming environment that feels immediate, approachable, and fun. Type a line. Run it. Change it. Learn by doing.
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.
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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.
