frontpage.

Hi HN,

I wanted to use an Android tablet as a second display on macOS, similar to Apple’s Sidecar — and I wanted it to work at the same time as an iPad running Sidecar so I could have 2 external displays with my MacBook (Sidecar only allows 1 iPad).

I couldn’t find anything that I liked, so I built Caboose.

Caboose lets you use an Android tablet as an additional macOS display via USB or Wi-Fi. It’s optimized for low latency and works well even wirelessly. You can use it alongside Apple Sidecar to drive both an iPad and an Android tablet from the same Mac.

To use Caboose and Sidecar together, Caboose needs to be started first, and the iPad added via Sidecar afterward. This is due to how macOS manages display devices.

I’ve been using this daily while traveling with a MacBook + Android tablet + iPad and it’s been very solid for my workflow.

Website: https://www.jefferyabbott.com/caboose

This is my first time posting to HN — happy to answer questions or talk through technical tradeoffs.

Discuss – Do AI agents deserve all the hype they are getting?

Ask HN: Anyone Using a Mac Studio for Local AI/LLM?

Ask HN: Non AI-obsessed tech forums

LLMs are powerful, but enterprises are deterministic by nature

Ask HN: Ideas for small ways to make the world a better place

Ask HN: 10 months since the Llama-4 release: what happened to Meta AI?

Ask HN: Who wants to be hired? (February 2026)

Ask HN: Who is hiring? (February 2026)

Ask HN: Non-profit, volunteers run org needs CRM. Is Odoo Community a good sol.?

AI Regex Scientist: A self-improving regex solver

Tell HN: Another round of Zendesk email spam

Ask HN: Is Connecting via SSH Risky?

Ask HN: Has your whole engineering team gone big into AI coding? How's it going?

Ask HN: Why LLM providers sell access instead of consulting services?

Ask HN: How does ChatGPT decide which websites to recommend?

Ask HN: What is the most complicated Algorithm you came up with yourself?

Ask HN: Is it just me or are most businesses insane?

Ask HN: Mem0 stores memories, but doesn't learn user patterns

Ask HN: Is there anyone here who still uses slide rules?

Kernighan on Programming

Ask HN: Anyone Seeing YT ads related to chats on ChatGPT?

Ask HN: Does global decoupling from the USA signal comeback of the desktop app?

Ask HN: Any International Job Boards for International Workers?

We built a serverless GPU inference platform with predictable latency

Ask HN: Does a good "read it later" app exist?

Ask HN: Have you been fired because of AI?

Ask HN: Anyone have a "sovereign" solution for phone calls?

Ask HN: Cheap laptop for Linux without GUI (for writing)

Ask HN: How Did You Validate?

Ask HN: OpenClaw users, what is your token spend?