Happy vs MarkD
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Happy
This app provides a secure mobile interface for AI coding assistants, allowing you to continue sessions and monitor progress from anywhere. It features end-to-end encryption and a zero-knowledge architecture for ultimate privacy. Seamlessly switch between desktop and mobile for uninterrupted AI coding.
- Seamless desktop and mobile session continuation
- Push notifications for AI tasks
- Offline access to conversation history
- End-to-end encryption for code privacy
- Real-time streaming of AI responses
- Zero-knowledge architecture
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Happy Coder is the secure mobile companion for Codex and Claude Code that lets you continue your AI coding sessions anywhere (not affiliated with Anthropic or OpenAI). Built by developers who needed to check on their AI assistant's progress during coffee breaks, this app brings the full Codex and Claude Code experience to your phone with military-grade encryption. **Important**: This app requires Codex or Claude Code to be installed on your computer. Happy Coder is a companion app that connects to your existing Codex or Claude Code setup. **Key Features:** - Continue Codex and Claude Code sessions seamlessly between desktop and mobile - Push notifications for permission requests and task completion - Access conversation history even when your terminal is offline - End-to-end encryption - your code stays private - Real-time streaming of AI responses - Zero-knowledge architecture - we can't read your data **How It Works:** 1. Install the happy-coder CLI on your computer 2. Scan a QR code to securely pair your devices 3. Use 'happy' instead of 'codex' or 'claude' to start encrypted sessions 4. Switch between desktop and mobile instantly Perfect for developers who: - Want to monitor long-running tasks on the go - Need secure access to proprietary code discussions - Value privacy and open-source transparency - Work from coffee shops, trains, or anywhere Happy Coder uses the same encryption as Signal (TweetNaCl) and is completely open source. Your encryption keys never leave your device, and all data is encrypted before transmission. Built by Bay Area engineers who believe the best tools come from scratching your own itch. We needed a way to securely check on our AI coding assistant while away from our desks - so we built it and shared it with the community. Your code. Your privacy. Your Codex and Claude Code companion. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
MarkD
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The Markdown reader for developers who think on the go. Open any .md file — README, design doc, API spec — and see it rendered in seconds. Code blocks highlighted in 40+ languages, Mermaid diagrams drawn automatically, HTML rendered cleanly. No setup, no clutter. iPhone in your pocket, ideas in your head. MarkD turns waiting time at the bus stop, the elevator, the coffee line into useful reading time. — Clean Markdown Rendering Headings (H1–H6), bold, italic, strikethrough, tables, blockquotes, links, images, ordered and unordered lists, checkboxes — all standard Markdown syntax fully supported. Both light and dark modes render with comfortable typography. Long documents scroll naturally in one continuous flow, with no screen transitions interrupting your reading. Code Syntax Highlighting Swift, Objective-C, Python, JavaScript, TypeScript, Go, Rust, Java, Kotlin, C, C++, C#, Ruby, PHP, Shell, SQL, HTML, CSS, JSON, YAML, and 40+ more languages are supported. Code blocks are highlighted with language-appropriate colors so structure is clear at a glance. Dark mode applies a low-fatigue color theme automatically. Mermaid Diagrams Mermaid code blocks inside Markdown are automatically detected and rendered as visual diagrams. Flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, and Gantt charts are all supported. Especially useful when reading system design documents, API flow docs, or database schemas. Folders & Tags Organize saved documents into folders and attach tags for easy retrieval. Filter by file type (Markdown, HTML, Swift, Python, JSON, and more) or search by title to instantly find any file. Use favorites to keep frequently viewed documents close at hand. Wide File Format Support Beyond .md and .markdown, MarkD opens .html, .swift, .py, .js, .ts, .go, .rs, .java, .kt, .c, .cpp, .cs, .json, .yaml, .yml, .txt, .sh, .rb, and virtually every text-based file format developers work with daily. Both the file extension and content are analyzed to automatically select the best rendering method. Files App Integration Long-press any file in the iOS Files app, choose "Open in MarkD," and it's imported instantly. Works with iCloud Drive, local storage, and third-party cloud storage. Duplicate files are never saved, keeping your library clean. Share Extension Share text or a URL from Safari, Notes, Slack, or any other app using the share sheet, and it's saved directly to your MarkD library. No need to open the app first — save as you read, in one natural motion. You can also share saved documents directly to other apps. Reading Info & HTML Support Word count and estimated reading time are automatically calculated when you open a document. HTML files are rendered in a built-in web view, with dark mode meta tags injected automatically. — Built for - Developers who frequently read READMEs and open source documentation - Engineers who want to view Markdown files from GitHub or GitLab on mobile - Writers who draft technical blog posts in Markdown and want to preview them - Team members who reference wikis, API docs, and design documents on the go - Anyone who wants to read documents containing code in a clean, focused environment MarkD is focused purely on reading documents well — no unnecessary features, no clutter. Experience the simplicity of opening it for the first time, and the satisfaction of a well-organized library as it grows.
Screenshots
Verdict
The clearest difference is price: Happy at Free against MarkD's $3.99. Happy also leads on chart position (#33 vs unranked) and iOS requirement (15.1 vs 17.0). MarkD's advantage is in-app purchases (none vs 1). On update cadence, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Happy is free to download; MarkD costs $3.99 up front. Happy sells 1 in-app purchase, starting at $19.99 per month. MarkD asks for nothing beyond the download.
Happy ships an update weekly, MarkD every 9 days. The most recent releases landed on September 28, 2026 and September 21, 2026 respectively.
| Parameter | Happy | MarkD |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | 4.9 (991 ratings) — better | — |
| Positive reviews | 71.2% of reviews | — |
| Number of ratings | 991 — better | — |
| Update frequency | Weekly — better | Every 9 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Best chart rank | #33 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 92 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Bulka, LLC | Jiwon Han |
In-app purchases
Happy
- Plus Plus Monthly$19.991 Month
MarkD
No in-app purchases









