Happy vs ScarfGo
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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Your coding agent shouldn't wait for you to get back to your desk. A task can run for an hour and then stop five minutes in to ask for permission or a decision. Happy lets you answer from your phone, and the same agent carries on in the same repository with the same tools and context. Happy is the mobile app for Claude Code and Codex. The agents keep running on your own computer, and your phone is how you start them, steer them and review their work. WHAT YOU CAN DO FROM YOUR PHONE • Start a new session or pick up one you began at your desk • Get notified when an agent needs input or finishes • Approve or deny permission requests, or let a session run in Auto mode • Choose the model and reasoning effort from the providers set up on your computer • Review changes: a file list, colored diffs, and the full set of changes on a branch • Attach a screenshot or photo to your prompt • Browse sessions in one list or grouped by project, with each checkout's chats as tabs • Open a side chat next to a session without losing your place • Drafts follow you between your phone and your computer HOW IT WORKS Happy runs on your computer, and this app connects to it. 1. Install Happy Desktop from happy.engineering, or if you prefer the terminal, run: npm install -g happy 2. Create an account in the app. You don't need an email address or a password. 3. Scan the QR code your computer shows to link it to your phone. Then start a session from either device. What you see on your phone is the same live session that's running on your computer. YOU WILL NEED • A computer running Happy Desktop or the Happy CLI • Access to the coding agents you want to use, such as a Claude or ChatGPT/Codex plan or API key. Happy uses your existing accounts. PRIVATE BY DESIGN Sessions are end-to-end encrypted. Your code, agent and encryption keys stay on your devices. Happy's servers only relay and store encrypted session data and can't read your prompts, responses or code. OPEN SOURCE The app, the CLI and the server are MIT-licensed and on GitHub. Read the code, run your own build or host your own server. ALSO ON DESKTOP Happy Desktop adds a harness that works across providers and lets you switch models in the middle of a task. The sessions it starts show up on your phone too. Happy is an independent project. It is not affiliated with or endorsed by Anthropic or OpenAI. Claude and Claude Code are trademarks of Anthropic. Codex and ChatGPT are trademarks of OpenAI. Privacy Policy: https://happy.engineering/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
ScarfGo
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ScarfGo is the iPhone companion to Scarf, the open-source macOS GUI for the Hermes AI agent. It connects from your phone to a Hermes server you operate — your Mac, a home Linux box, a cloud VM, anything reachable over SSH — and lets you run sessions, browse memory, manage cron jobs, and resume conversations on the go. A fully native iOS app, not a web view or a remote desktop. ScarfGo speaks SSH directly using a pure-Swift implementation, reads Hermes state via SFTP and SQLite snapshots, and streams real-time agent output over the Agent Client Protocol on a long-lived SSH exec channel. Every byte stays between your device and the Hermes host you configured. What you can do: • Multi-server. Configure as many Hermes hosts as you like and switch between them with a tap. Soft Disconnect keeps your credentials cached; Forget wipes a server end-to-end. • Dashboard. Stats and the 25 most recent sessions, with project badges so you can tell at a glance which work is which. • Project-scoped chat. Pick a project from your registry and ScarfGo writes the same Scarf-managed AGENTS.md context block the Mac app does, so the agent boots with the right project context. The resulting session is attributed correctly across both clients. • Session resume. Tap any row on the Dashboard to open that session's transcript in Chat. CLI-started sessions hydrate from the Hermes state database; ACP sessions show an empty-state because Hermes does not persist ACP transcripts to the database. • Memory editor. Read and edit MEMORY.md and USER.md with a Saved indicator that survives keyboard dismissal and a one-tap Revert. • Cron list. Human-readable schedules ("Every 6 hours", "Weekdays at 09:00") instead of raw cron expressions, plus a relative next-run estimate. Read-only in this release; editing comes in a future update. • Skills browser. Read-only category tree with the SKILL.md frontmatter chips (allowed tools, related skills, dependencies) the Mac app shows. • Settings viewer. Read-only inspection of your config.yaml. Edit values from the Mac app or a remote shell. Privacy. ScarfGo does not collect, transmit, or store your data on any server controlled by the developer. There are no analytics, no telemetry, no ad identifiers. SSH keys are generated on-device and stored in the iOS Keychain with the ThisDeviceOnly attribute, so they are unreachable while the device is locked and never sync to iCloud. The complete privacy policy lives at awizemann.github.io/scarf/privacy. Open-source under the MIT license. Source, issue tracker, and contributor docs at github.com/awizemann/scarf. Bug reports tagged component:scarfgo go straight to the developer. Requirements. iOS 18.0 or later. An SSH-reachable Hermes server (Hermes v0.10.0 or later recommended; full v0.11.0 features supported). Your phone needs to be able to reach that server over the network, for example on the same Wi-Fi or at a public address that accepts SSH connections. ScarfGo itself does not provide any network or VPN service.
Screenshots
Verdict
The clearest difference is in-app purchases: ScarfGo at none against Happy's 1. Happy's advantage is chart position (#82 vs unranked) and device support (3 vs 1). On price 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. ScarfGo asks for nothing beyond the download.
| Parameter | Happy | ScarfGo |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (1K ratings) — better | — |
| Positive reviews | 71.6% of reviews | — |
| Number of ratings | 1K — better | — |
| Update frequency | Weekly | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Best chart rank | #82 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.1 — better | 18.6 |
| Further details — not scored | ||
| Size | 98 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Bulka, LLC | Alan Wizemann |
In-app purchases
Happy
- Plus Plus Monthly$19.991 Month
ScarfGo
No in-app purchases









