Subreddits for Hardware

FAQ

What are Hardware subreddits?

Communities for hardware engineers, electronics hobbyists, and embedded systems developers. Discord and Reddit host communities for Arduino, Raspberry Pi, PCB design, and DIY electronics, alongside more professional spaces for engineers working on commercial hardware products. This page focuses on communities hosted on Reddit, so you can compare their size, features, reviews, and access requirements in one place.

What are the most popular hardware subreddits on Hive Index?

r/robotics, r/buildapc, r/Battlebots, and r/PLC are among the most popular hardware subreddits in the Hive Index directory of communities, based on visitor interest on Hive Index. This is not a universal quality score. You can also compare listings by review scores, member counts, and listing age on Hive Index.

Are hardware subreddits free to join?

All 12 listings in the Hive Index directory of communities are marked as free to join. Popular examples include r/robotics, r/buildapc, r/Battlebots, and r/PLC. Access rules can still change on the community side.

What features do these subreddits include?

Forum is the most common feature (100% of listings).

How large are hardware subreddits?

Hive Index lists 12 hardware subreddits in the Hive Index directory of communities. The largest include r/buildapc (8.5M members), r/hardware (4.4M members), and r/raspberry_pi (3.3M members). Median reported size is about 286K members (12 listings with member data). We only have a handful of listings so far, so treat these numbers as directional.

How do I join a Hardware community on Reddit?

Browse listings in the Hive Index directory of communities, open a community that fits your needs, and follow its join link to Reddit. Some communities may require an application or paid membership, which is shown on the listing when known.

How do I grow my Hardware community on Reddit?

List your Hardware community on Reddit for free on Hive Index to reach people already searching for Hardware subreddits. Paid promotion can feature your community more prominently across relevant pages and send more qualified visitors to your listing.

How does Hive Index collect and rank listings?

Listings are submitted by community builders and researchers, reviewed for topic relevance, and updated with platform, feature, member, review, and traffic data where available. Member counts are approximate. Popular reflects visitor interest in the Hive Index directory of communities, with richer profiles breaking ties. Ratings, Largest, and Newest use review scores, reported member counts, and listing age instead. These listings in the Hive Index directory of communities were last updated 6/5/2026.