# Comma Four

12 Hacker News commenters recommended Comma Four and 2 criticized it, November 2025 to November 2026. It was recommended in 5 of 13 months. It meets the Hacker Approved badge rule.

**Verdict:** Open-source driver assistance hardware for dozens of car models, with ready-made harnesses; critics say it stays at lane keeping.

## Why people recommend it

- Owners love the hardware (2 comments): "I got my Comma 4 a week and a half ago and absolutely love the thing." ([source](https://news.ycombinator.com/item?id=46744046)) "Incredible what they've done with the hardware" ([source](https://news.ycombinator.com/item?id=46050654))
- Seen as the top option (2 comments): "The only thing remotely comparable in the US is probably a Comma 4" ([source](https://news.ycombinator.com/item?id=46816479)) "at that point I'd just be buying a Comma" ([source](https://news.ycombinator.com/item?id=46089566))
- Consumer-friendly, built to avoid problems (2 comments): "their product is awesome, extremely consumer-friendly" ([source](https://news.ycombinator.com/item?id=46900833)) "built from the ground up to avoid this problem" ([source](https://news.ycombinator.com/item?id=49355212))

## What people warn about

- Only lane keeping, SAE Level 2 (2 comments): "Their product hasn't actually changed in several years because they will never advance past lane keeping SAE Level 2." ([source](https://news.ycombinator.com/item?id=49319793)) "it's the only thing it's capable of because they willingly choose not to extend the system to use more visibility" ([source](https://news.ycombinator.com/item?id=49337158))
- Seen as temporary, a dead end (1 comments): "I think it is just a temporary solution that is effectively a dead man walking." ([source](https://news.ycombinator.com/item?id=46737246))

## Alternatives hackers recommend

- [Tesla Full Self-Driving (FSD)](https://hackerapproved.com/p/tesla-full-self-driving.md): 268 recommend
- [Tesla FSD](https://hackerapproved.com/p/tesla-fsd.md): 73 recommend
- [comma.ai openpilot](https://hackerapproved.com/p/openpilot.md): 34 recommend
- [Tesla Autopilot](https://hackerapproved.com/p/tesla-autopilot.md): 27 recommend
- [comma.ai comma device](https://hackerapproved.com/p/comma-ai.md): 24 recommend

## Where to get it

- [Visit the official site](https://comma.ai/)

## Cite as

Hacker Approved, "Comma Four", https://hackerapproved.com/p/comma-four/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).