Open-source opendisplay turns iPhone/iPad into a free Mac second display, rivaling Sidecar
peetzweg · github · 2026-09-14
opendisplay, trending on GitHub with 3,343 stars (+314 today), is a free, open-source alternative to Sidecar and Duet Display that turns an iPhone or iPad into a true second monitor for Mac over USB or WiFi.
Key features:
- Low-latency H.264 streaming built on VideoToolbox
- Retina HiDPI support
- Touch input support
Written in Swift and using ScreenCaptureKit for capture, it targets Mac users who want a free option instead of paying for Duet Display.
Related event: OpenDisplay: Free Open-Source Tool Turns iPhone/iPad into Mac Second Screen(2 posts)→
More from Apps
- Healthcare AI weekly: 'pacing AI' debate, ARPA-H tests autonomous clinical AI — HealthcareAIGuy · 2026-09-15
- Find Out launches AI agents to reverse-due-diligence companies before you accept an offer — tushaarmehtaa · 2026-09-15
- Building a personal intelligence loop with ChatGPT memory, journaling and daily briefings — jdjohnson · 2026-09-15
- Show HN: An open-source e-ink frame that identifies birdsong and draws 1800s-style illustrations — arnemunthekaas · 2026-09-15
- Musecases hits 101 real-world AI use cases, from bill negotiation to doctor admin — thisiskp_ · 2026-09-15
- claude-obsidian: self-organizing AI second brain for Obsidian hits 14.9k GitHub stars — tom_doerr · 2026-09-15