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
Mermaid Editor - MMChart Live
Bring your ideas to life with the power of Mermaid Live Editor - anytime, anywhere.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
13 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 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 Mermaid Editor - MMChart Live: 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 chart options to include more templates and customization.
Assumption to check: Limited chart types compared to rivals
Validate with people who use this workflow before building.
Hypothesis 2
Implement real-time collaboration for users to work together.
Assumption to check: No collaboration features
Validate with people who use this workflow before building.
Hypothesis 3
Add a guided tutorial or syntax helper to ease learning.
Assumption to check: Complex syntax can be intimidating for beginners
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance for low-end devices to improve accessibility.
Assumption to check: Inconsistent performance on older devices
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
Bring your ideas to life with the power of Mermaid Live Editor - anytime, anywhere. Whether you are a developer mapping out system architecture, a student visualizing logic, or a project manager building Gantt charts, Mermaid Live Editor is the ultimate mobile workspace for Mermaid diagrams. No more waiting to get back to your desk; write code and visualize complex charts directly on your phone with a seamless, high-performance editor. Key Features: - Real-Time Live Preview: See your diagrams take shape as you type. Our split-screen or toggle view ensures your visual logic matches your code instantly. - Full Syntax Highlighting: Write clean, readable code with an editor designed specifically for Mermaid syntax. - Support for All Chart Types: Flowchart, Sequence Diagram, Class Diagram, State Diagram, Entity Relationship Diagram, User Journey, Gantt, Pie Chart, Quadrant Chart, Requirement Diagram, GitGraph Diagram, C4 Diagram, Mindmap, Timeline, Zenuml, Sankey, XYChart Diagram, Block Diagram, Packet Diagram, Kanban Diagram, Architecture Diagram, Radar Diagram, Treemap Diagram. - Learn & Template Gallery: New to Mermaid? Browse our library of examples to learn the syntax and kickstart your projects with one tap. - Powerful File Management: Open, edit, and save .mmd files directly. Keep your workflow consistent across your mobile and desktop environments. - Professional Exports: Share your work in high resolution. Export your diagrams in PNG, JPEG, WebP, SVG, or PDF formats. - Offline Mode Support: No internet? No problem. Generate and preview diagrams locally without needing a network connection. Why Choose Mermaid Live Editor? - Speed: Light-weight and optimized for mobile performance. - Versatility: Perfect for documentation, software design, and business presentations. - Privacy: Your data stays on your device. Turn complex thoughts into beautiful diagrams with Mermaid Chart Editor. Download now and start creating! Term of Use: https://termux-studio.org/terms-of-use?name=Mermaid Privacy Policy: https://termux-studio.org/privacy-policy?name=Mermaid
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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
Firebase
Zustand
react-native-webview
@react-navigation/native
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.
