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
JSitor - JS, HTML & CSS Editor
An advanced editor to write, test and share JavaScript, CSS, and HTML snippets in mobile phones and tablets
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.6
30 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 JSitor - JS, HTML & CSS Editor: map the core Productivity 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
Integrate popular libraries for better functionality.
Assumption to check: Limited support for external libraries and frameworks.
Validate with people who use this workflow before building.
Hypothesis 2
Implement project folders and tagging system.
Assumption to check: Lacks an intuitive way to organize multiple projects.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize performance for larger files and better memory management.
Assumption to check: Performance issues with large codebases.
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
An advanced editor to write, test and share JavaScript, CSS, and HTML snippets in mobile phones and tablets. Below are the main features - 1. Support various languages mode such as - JS, JSX, TypeScript, CSS, SASS, SCSS, PostCSS, Less, HTML, Pug. 2. Best in-class editor experience with quick shortcut keys and code suggestions to write faster. 3. Inbuilt options to quickly select, cut, copy, paste and format the code snippets. 4. Easily manage snippet CDN libraries, settings, language modes and various other editor options. 5. Start with predefined templates to start really quick 6. Start with where you left previously using drafts 7. View, editor, fork and share what others are doing using explore option 8. Simplified profile management 9. Auto synchronizes snippets to web version (jsitor.com) Please note that - These snippets are stored in JSitor server(not drafts) and can be easily shared with others. All snippets available on this application are publicly accessible. The author of this application is not responsible or liable for loss or damage of any kind during the usage of provided code. Report issue - https://github.com/jsitor/jsitor/issues Privacy Policy - https://github.com/jsitor/jsitor/blob/master/PrivacyPolicy.md Website - https://jsitor.com
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.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
react-native-syntax-highlighter
react-navigation
expo-web-browser
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.
