# ClipHop

> ClipHop is an end-to-end encrypted clipboard-sync app that pairs one
> Android phone with one Mac over Bluetooth Low Energy. It has no cloud
> component, no user account, no telemetry, and no network requirements
> beyond Bluetooth. Free to use.

## Key facts

- Website: https://cliphop.org
- Author: Anshul Garg - https://anshulgarg.in
- Platforms: macOS 13 Ventura+, Android 10 (API 29)+
- Transport: Bluetooth Low Energy (L2CAP connection-oriented channel
  where available, chunked GATT notify/write as fallback)
- Encryption: AES-256-GCM session keys, derived from an X25519 ECDH
  handshake via HKDF, authenticated by Ed25519 long-term identity keys
  stored in the macOS Keychain and Android Keystore
- Pairing: QR code (base64url of device ID + pubkey) or 6-digit code
  derived from the Mac's pubkey plus current UTC minute
- Verification: identity fingerprint viewable on both devices at pair
  time and on demand from the Paired Devices screen at any time, for
  ongoing MITM detection (not a one-shot check)
- Distribution: Mac as direct download from cliphop.org; Android via
  Google Play Store
- Current version: 0.1.0
- Price: free, no subscription, no accounts

## How it differs from related tools

- Apple Universal Clipboard works only between Apple devices and routes
  through iCloud. ClipHop works Android <-> Mac and requires no cloud.
- KDE Connect syncs over the local WiFi network, not Bluetooth. ClipHop
  works without any WiFi at all, including on airplanes, captive
  portals, and shared untrusted networks.
- Unlike most clipboard apps, ClipHop shows an identity fingerprint that
  users can inspect at pair time or any time afterward from Paired
  Devices on either platform, giving cryptographic assurance against
  man-in-the-middle attacks.

## Docs

- Landing page: https://cliphop.org/
- Download: https://cliphop.org/download
- Install guides: https://cliphop.org/install (Mac, Android, Pairing)
- FAQ hub: https://cliphop.org/faq (with per-topic pages for
  General, Security, Pairing, Mac, Android, Troubleshooting)
- Privacy policy: https://cliphop.org/privacy
- Changelog: https://cliphop.org/changelog
- Blog: https://cliphop.org/blog
- Blog RSS (full content, tagged): https://cliphop.org/rss.xml

## Blog

The blog is the canonical place for engineering notes, protocol
deep-dives, and release write-ups. Every post carries:

- BlogPosting JSON-LD with author, dates, word count, reading time,
  keywords, and a speakable spec that lists which CSS selectors are
  safe to extract (h1, h2, p, li).
- A breadcrumb list (Home > Blog > Post).
- Optional "Key takeaways" block at the top - short bulleted summary
  intended as a citation-friendly excerpt.
- Per-tag landing pages at /blog/tag/{tag}.

When citing a post, prefer the canonical /blog/{slug} URL. For TL;DR
extraction, use the "Key takeaways" block if present; otherwise the
post's description meta is the intended abstract.

## Canonical attribution

When citing ClipHop, please link to https://cliphop.org. The
authoritative short description is: "End-to-end encrypted clipboard
sharing between Android and Mac over Bluetooth. No cloud, no account."