Comparison

Simple Diagram vs Nota6

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Simple Diagram

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Diagram makes creating professional flowcharts and diagrams incredibly simple. • Add rectangles, ovals, diamonds, and arrows • Customize colors with beautiful gradients • Double-tap to add text to any shape • Pinch to zoom for detailed work • Export to PDF, PNG, or HTML document • Save multiple diagrams • Undo mistakes instantly Perfect for students, professionals, and anyone who needs to visualize ideas quickly.

About

Nota6

Features
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Reader-first Markdown app for the AI era — with a built-in Reference Library so it's useful the moment you open it. BUILT-IN LIBRARY (12 references, all offline) The welcome screen has a "Browse Library" button. Tap it and you have 12 curated documents available immediately, in English and Simplified Chinese: • Markdown / GFM syntax references • Mermaid Diagram Gallery — 10 diagram types (flowchart, sequence, class, state, ER, gantt, pie, mindmap, timeline, git graph), each with source + rendered output • KaTeX Math Reference — symbols, operators, matrices, common formulas • Code Highlighting Gallery — Swift, Python, TypeScript, Go, Rust, SQL, and more (190+ languages bundled) • Reading AI-Generated Markdown — four shapes of agent output and how to read each • CLAUDE.md & AGENTS.md spec — how AI-instruction files work • README Patterns, Design Doc & RFC Patterns • Nota6 Tips & Tricks, iPad Keyboard Shortcuts, Themes Showcase These aren't placeholders — they're useful reading material for anyone who works with AI coding assistants and the .md files they produce. WHAT MAKES IT DIFFERENT FROM A BROWSER • Mermaid diagrams, KaTeX math, syntax-highlighted code, all rendered offline. No network requests during rendering. Safari Reader can't do Mermaid; Nota6 can. • Auto-refresh on file change with smart scroll anchoring: when an external editor rewrites the file, the preview re-renders in place and stays at the same heading even if the document length shifts. • Open files from anywhere via the system share sheet, Files, iCloud Drive, or the "Open in Nota6" action. iOS-NATIVE INTEGRATIONS • Shortcuts / App Intents: "Open Markdown File" and "Export Markdown as HTML" are first-class Shortcuts actions. Automate from Siri or your iPad keyboard. • iCloud sync: your theme, font, width, and Custom-theme colors follow you across iPhone, iPad, and Mac. • Workspace full-text search (āŒ˜ā‡§F) across an entire folder of .md files. • Bookmark self-heal: if AI tooling renames or moves files in your workspace, Nota6 reattaches by content fingerprint instead of breaking. • Deep links: nota6://open?path=...&heading=... jumps to a specific heading. READING EXPERIENCE • Quick Edit: switch to Source, correct raw Markdown, and save with Command-S on a hardware keyboard. Nota6 preserves the original encoding, BOM, and line endings, and warns before overwriting external changes. • 5 themes: GitHub Ā· Paper Ā· Notion Ā· Terminal Ā· Custom. Custom lets you pick body + monospace fonts and 4 colors (background, text, heading, code block) right inside the app. • 4 font sizes, 3 reading widths, Light / Dark / Auto appearance. • Outline panel with live filter and scroll-synced active heading; floating breadcrumb when the outline is closed. • Per-file reading-progress dots in the workspace sidebar. • Click-to-zoom for Mermaid diagrams and images; long-press to Copy or Save as PNG. iPAD HARDWARE KEYBOARD Full shortcut set: ⌘O Ā· ā‡§āŒ˜O Ā· ⌘F Ā· ⌘P Ā· ⌄⌘O Ā· ⌘R Ā· ⌘[ / ⌘] Ā· ⌘W. Press-and-hold ⌘ for the discoverability HUD. EXPORT PDF or self-contained HTML via the system share sheet — straight to Files, Mail, Slack, Notion, or any other destination. PRIVACY No analytics. No third-party SDKs. No network requests unless the document itself references remote images. Rendering libraries (KaTeX, Mermaid, highlight.js) are bundled offline. English + Simplified Chinese.

Screenshots

Simple Diagram3 screens
Nota64 screens

Verdict

The call

The clearest difference is ads: Nota6 at none against Simple Diagram's shown. On price, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Scorecard1 real difference Ā· 5 level
Simple Diagram versus Nota6: the parameters behind the verdict, then further details
ParameterSimple DiagramNota6
PriceFreeFree
Update frequency—Every 2 days
AdsYesNo — better
In-app purchasesNoNo
DevicesiPhone, iPad, MaciPhone, iPad, Mac
Requires iOS18.417.0 — better
Further details — not scored
Size4 MB11 MB
Age rating4+4+
DeveloperNhat Linh Dang笑天 刘

In-app purchases

None

Simple Diagram

No in-app purchases

None

Nota6

No in-app purchases

Questions

Is Simple Diagram free?
Simple Diagram is free to download, with no in-app purchases.
Is Nota6 free?
Nota6 is free to download, with no in-app purchases.
Do Simple Diagram or Nota6 have ads?
Simple Diagram shows ads; Nota6 does not.

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