Comma Four
Hacker ApprovedRanked 6 of 9 driver assistance systems by recommenders
Open-source driver assistance hardware for dozens of car models, with ready-made harnesses; critics say it stays at lane keeping.
Open-source driver assistance hardware for dozens of car models, with ready-made harnesses; critics say it stays at lane keeping.
14 people gave an opinion
- recommend it
- 12
- criticize it
- 2
- approval share
- 86%
Recommended in 5 of 13 months
- November 2025: recommended
- December 2025: not recommended
- January 2026: recommended
- February 2026: recommended
- March 2026: not recommended
- April 2026: recommended
- May 2026: not recommended
- June 2026: not recommended
- July 2026: not recommended
- August 2026: recommended
- September 2026: not recommended
- October 2026: not recommended
- November 2026: not recommended (month in progress)
Why it carries the badge
- 12 people recommend itNeeds 10 or more, met.
- 6 recommenders for every criticNeeds 2 to 1 or better, met.
- Recommended in 5 of 13 monthsNeeds 4 or more, met.
The same three rules apply to every product, and the badge can’t be bought. How the badge works
What people say about it
The reasons people give, with the number of comments that give each one. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Owners love the hardware
“I got my Comma 4 a week and a half ago and absolutely love the thing.”
Comment from 24 Jan 2026 in “Open-source self-driving for 325 car models from 27 brands” “Incredible what they've done with the hardware”
Comment from 25 Nov 2025 in “The Comma Four” Seen as the top option
“The only thing remotely comparable in the US is probably a Comma 4”
Comment from 29 Jan 2026 in “Tesla ending Models S and X production” “at that point I'd just be buying a Comma”
Comment from 29 Nov 2025 in “Testing shows automotive glassbreakers can't break modern automotive glass” Consumer-friendly, built to avoid problems
“their product is awesome, extremely consumer-friendly”
Comment from 5 Feb 2026 in “Don't rent the cloud, own instead” “built from the ground up to avoid this problem”
Comment from 19 Aug 2026 in “Chestnut – eGPU dock with open-source firmware”
What people warn about
Each mark is one comment
Only lane keeping, SAE Level 2
“Their product hasn't actually changed in several years because they will never advance past lane keeping SAE Level 2.”
Comment from 16 Aug 2026 in “Chestnut – eGPU dock with open-source firmware” “it's the only thing it's capable of because they willingly choose not to extend the system to use more visibility”
Comment from 17 Aug 2026 in “Chestnut – eGPU dock with open-source firmware” Seen as temporary, a dead end
“I think it is just a temporary solution that is effectively a dead man walking.”
Comment from 23 Jan 2026 in “Tesla kills Autopilot, locks lane-keeping behind $99/month fee”
Other driver assistance systems people recommend
The four most recommended other driver assistance systems, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.
| Product | Recommend | Criticize | Approval | Months | Owned | Badge |
|---|---|---|---|---|---|---|
| Tesla Full Self-Driving (FSD) | 268 | 618 | 30% | 12 | 3 yrs32 owners | — |
| Tesla FSD | 73 | 88 | 45% | 12 | 2 yrs4 owners | — |
| comma.ai openpilot | 34 | 10 | 77% | 9 | — | Approved |
| Tesla Autopilot | 27 | 148 | 15% | 8 | 2 yrs3 owners | — |
| Comma FourThis page | 12 | 2 | 86% | 5 | — | Approved |
What people said
12 of the 16 comments that mention it, newest first. Each links to the original comment.
“built from the ground up to avoid this problem”
“it's the only thing it's capable of because they willingly choose not to extend the system to use more visibility”
“where dozens of car models are supported, pre-made harnesses are just a buy button away, and everything is open source”
“Their product hasn't actually changed in several years because they will never advance past lane keeping SAE Level 2.”
“their product is awesome, extremely consumer-friendly”
“The only thing remotely comparable in the US is probably a Comma 4”
“I got my Comma 4 a week and a half ago and absolutely love the thing.”
“I think it is just a temporary solution that is effectively a dead man walking.”
“at that point I'd just be buying a Comma”
“Those are excellent UI elements that my current vehicle does not provide”
“Incredible what they've done with the hardware”
“It's not self driving, it's just really really good cruise control.”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.