ProtonMail

ProtonMail's top 10 neighbors span technology brands, science publishers, food companies, and government accounts — a wide compositional mix with no single dominant cluster and scores compressed between 0.76 and 0.73.

The shape is flat. Dropbox leads at 0.76, followed immediately by Beyond Meat at 0.76 — a food brand sitting nearly level with a cloud storage service. GitHub comes in at 0.75, and CDC Emergency at 0.74. Flipboard (0.74) and Dr. Michio Kaku (0.74) round out the upper tier. Tallying subcategories across the full top 10: Technology brands account for three entries (Dropbox, GitHub, Hootsuite Mobile), but the remaining seven span Food, Government, Magazines, Academics, Miscellaneous Technology, Websites, and B2B — no single subcategory dominates. The cross-kind character is the defining feature here: ProtonMail's own subcategory (Technology) is shared by only three of its ten nearest neighbors, meaning the audience shape is pulled as much by science-curious, civically engaged, and broadly digital-minded audiences as by software users specifically. The Boeing Company (0.73) and O'Reilly Media appearing in the wider neighbor set further reinforce a professional, technically literate orientation that cuts across categories.

The flat, cross-kind distribution suggests ProtonMail's audience is defined less by product category affinity than by a broader profile that overlaps with science media, developer tools, and institutional accounts in roughly equal measure.