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
JSBox - Learn to Code
* JSBox is featured by: sspai.com, Price Tag, AppSolution etc
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.9
84 ratings · Top 50%
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 JSBox - Learn to Code: 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
Implement a more robust execution engine for various programming languages.
Assumption to check: Limited code execution capabilities
Validate with people who use this workflow before building.
Hypothesis 2
Add social features to share projects and collaborate.
Assumption to check: Lack of community features
Validate with people who use this workflow before building.
Hypothesis 3
Optimize performance for smoother execution.
Assumption to check: Occasional lag when running code
Validate with people who use this workflow before building.
Hypothesis 4
Create comprehensive tutorials and an in-app help system.
Assumption to check: Inadequate tutorial/support content
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
* JSBox is featured by: sspai.com, Price Tag, AppSolution etc # What's JSBox? JSBox is an Integrated Development Environment for JavaScript. You can learn to code JavaScript here, as we provide tons of utilities to enhance the development experience. JSBox is amazing for both beginners and experienced engineers. Don't you wanna try it out? Don't hesitate to create cool stuff—do it now! # What can JSBox do? Of course you can write JavaScript, but the most important thing is that you can create native iOS utilities, such as: - Upload photos you have just taken to the server - Create a widget to check bus information - Schedule tasks by leveraging date-based or location-based notifications - Design an extension for the Photos app to search photos directly - Design your own widget and keyboard - Make a real-time tool to query the exchange rate - Collect your most important contacts and handle it on the widget There are many possibilities; we believe you can create coolest stuff. # What's in JSBox? JSBox is not only a full-fledged environment for standard JavaScript, but also provides many utilities: - A safe environment to run JavaScript natively with incredible performance - A beautiful editor to write JavaScript, multiple themes, auto-completion, and snippets... - Many advanced development tools: lint, prettier, diff viewer and database viewer... - A desktop extension to write code extremely fast and comfortable - Almost all the cool tech in iOS: Siri/Shortcuts, Today Widget, Action Extension, 3D Touch, Home Screen Shortcut... - A lot of awesome examples for beginner We are still working on it and will introduce cooler features in the future. # Terms of Use https://jsboxbbs.com/d/1035-terms-of-service # Privacy Policy https://jsboxbbs.com/d/1034-privacy-policy # Contact us! Please contact us in the following ways. Don't hesitate to report any issues. Thank you! - [Community](https://en.jsboxbbs.com) - [Email](mailto:[email protected]) - [Twitter](https://twitter.com/cyanapps) - [Weibo](https://weibo.com/0x00eeee)
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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
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.
