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
Markdown Notes Editor: Markden
Markden is a privacy-first markdown editor and writing app designed for people who value ownership of their words
$1.99
PRICE
$1.99
No in-app purchases
BUSINESS MODEL
Paid
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
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.
JavaScript is required to complete mailbox verification.
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 Markdown Notes Editor: Markden: map the core Productivity workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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
Full offline with background sync
Assumption to check: No offline mode
Validate with people who use this workflow before building.
Hypothesis 2
Real-time sync with conflict resolution UI
Assumption to check: Sync issues
Validate with people who use this workflow before building.
Hypothesis 3
Minimal design, progressive feature disclosure
Assumption to check: Feature bloat
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
Markden is a privacy-first markdown editor and writing app designed for people who value ownership of their words. Every file stays on your device. No account required. No cloud lock-in. Just your thoughts in plain text. Markdown editing with real-time syntax highlighting AI writing assistant powered by Claude (bring your own API key) Full offline support with no internet required for core features AES-256 file encryption for sensitive documents Todo.txt task management with priorities, contexts, and projects Version history with up to 50 snapshots per file Focus mode with Pomodoro timer and word count goals 13 file formats supported including Markdown, JSON, YAML, CSV, Org-Mode, and AsciiDoc Dark and light terminal-inspired themes Quick note capture for instant ideas Daily notes with auto-generated templates Find and replace with full regex support Kanban board view for task management Live markdown preview with math (KaTeX) and diagrams (Mermaid) Export to HTML for sharing and publishing Customizable editor with multiple fonts, sizes, and spacing options AI WRITING TOOLS Fix grammar and spelling Rewrite for clarity Summarize long documents Change tone (formal or casual) Continue writing from where you left off Explain code blocks Generate tables and todo lists from text You pay Anthropic directly for AI usage. Markden never touches your API key or data. PRIVACY BY DESIGN All files stored locally in your app sandbox API key secured in iOS Keychain No analytics, no tracking, no telemetry No third-party SDKs that collect data No account or sign-up required Uninstalling removes everything. Nothing persists elsewhere. BUILT FOR PRODUCTIVITY 6 built-in templates: meeting notes, blog post, journal, weekly review, Cornell notes, and project readme Smart auto-save with configurable intervals File browser with favorites, search, and sort options Breadcrumb navigation for nested folders Swipe actions for quick file management Custom keyboard toolbar with format-specific shortcuts DESIGNED FOR IPHONE AND IPAD Sidebar navigation on iPad with split view editor and preview Adaptive layouts that use the full screen on every device Keyboard shortcuts and external keyboard support Markden is free to download with all editing features included. AI features require your own Anthropic API key which you can get at console.anthropic.com. Whether you write meeting notes, journal entries, blog posts, code documentation, or manage daily tasks, Markden gives you a fast, private, distraction-free space to think and write. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
Supabase
Expo
RevenueCat
BUILD KIT DIFFICULTY
Starter
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.
