Async.dev vs Happy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Async.dev
This app allows developers to interact with their projects using natural language. You can issue tasks, create project plans, and review code through voice commands, streamlining the development workflow.
- Voice-controlled task management
- AI-assisted bug fixing
- UI tweaking via natural language
- Code review functionality
- Project planning tools
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Build Async. Talk to your projects to fix bugs, tweak UIs, and implement features (e.g., "hey Async, can you fix the landing page for me?"). Async lets you issue tasks, create plans, and review code all in one place.
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/
Screenshots
Verdict
The clearest difference is in-app purchases: Async.dev at none against Happy's 1. Happy's advantage is ratings volume (991 vs 2) and chart position (#97 vs unranked). On price, rating, update cadence and ads 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
Both are free to download. Happy sells 1 in-app purchase, starting at $19.99 per month. Async.dev asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Async.dev against 4.9 for Happy. That said, the two scores are not equally well evidenced: Happy has 991 ratings behind it against 2, so its average is the more settled of the two.
Async.dev ships an update every 4 days, Happy weekly. The most recent releases landed on September 21, 2026 and October 8, 2026 respectively.
| Parameter | Async.dev | Happy |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.9 (991 ratings) |
| Positive reviews | — | 71.2% of reviews |
| Number of ratings | 2 | 991 — better |
| Update frequency | Every 4 days — better | Weekly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Best chart rank | — | #97 — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 91 MB | 92 MB |
| Age rating | 17+ | 4+ |
| Developer | Mikkel Kim | Bulka, LLC |
Customer experience
Async.dev
Happy
In-app purchases
Async.dev
No in-app purchases
Happy
- Plus Plus Monthly$19.991 Month
