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
CodeRun - Code Snippet Run
CodeRun is a powerful mobile code arena that allows you to run and edit code in various programming languages on your mobile device
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 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 CodeRun - Code Snippet Run: 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 advanced features like tagging, version control, and snippet sharing.
Assumption to check: Limited snippet management features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate a code execution environment to run snippets directly within the app.
Assumption to check: No code execution capabilities
Validate with people who use this workflow before building.
Hypothesis 3
Enhance search with filtering options and advanced algorithms.
Assumption to check: Basic search functionality
Validate with people who use this workflow before building.
Hypothesis 4
Add functionality for users to share snippets and collaborate with others.
Assumption to check: No collaboration features
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
CodeRun is a powerful mobile code arena that allows you to run and edit code in various programming languages on your mobile device. It supports 680 languages, ranging from popular ones like Python, Java, Swift, C#, JavaScript, and C++ to more obscure ones like Brainfuck, INTERCAL, and Malbolge. It's perfect for developers, students, and anyone who wants to explore programming on a mobile device. Features: Wide language support: CodeRun supports 680 programming languages, covering a vast range of programming language options. Instant execution: Simply write your code and click the run button to see the output immediately. Interactive debugging: The integrated debugger allows you to step through your code and inspect variable values. Code sharing: Easily share your code snippets or import code from other users. Advantages: Convenience: Quickly try out code on a mobile device without setting up a local development environment. Learning-friendly: The interactive environment is great for learning new programming languages or concepts. Collaboration-friendly: Easily share code snippets with others to foster collaboration and knowledge sharing. Versatility: Supporting multiple languages makes it an ideal tool for various programming tasks. Scalability: Continuously adding new languages and features ensures compatibility with the latest developments in programming languages and technologies. Use Cases: CodeRun is suitable for a wide range of use cases, including: Learning programming: Explore different programming languages in an interactive environment without setting up complex development environments. Code prototyping: Quickly test algorithms or concepts before writing full programs. Code debugging: Isolate and solve code issues without setting up a complete development environment. Code golfing: Attempt to write code that is as concise and efficient as possible. Code sharing: Share code snippets with others for collaboration, showcasing, or knowledge sharing. Unlimited Access Subscription: - With this subscription, you can enjoy unlimited access to all features within the app. - Subscriptions are charged weekly, monthly, or yearly, depending on the selected subscription plan. - Payment will be charged to your iTunes account upon confirmation of purchase. - You can turn off auto-renewal at least 24 hours before the current subscription period ends; otherwise, the subscription will automatically renew. - The renewal fee will be charged to your account within 24 hours before the end of the current subscription period, depending on the chosen plan. - Users can manage their subscriptions and can turn off auto-renewal in their account settings after purchase. - Any unused portion of a free subscription trial period will be forfeited upon purchase. Privacy Policy: https://www.dazhuogroup.com/coderun/privacy_statement_en.php Terms of Use: https://www.dazhuogroup.com/coderun/terms_of_use_en.php
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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
Zustand
react-native-syntax-highlighter
@react-native-async-storage/async-storage
expo-router
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.
