Enhanced email clients for triage, summarize, and draft (Inbox Zero)
63 companies on usedby use at least one of the 3 tools in this category with a public customer. Superhuman leads with 32 companies. Then come Shortwave (22) and Fyxer AI (12). 3 companies run two of these tools or more. The most common pair is Shortwave with Superhuman (3 companies).Latest check Oct 7, 2026: 58 of 66 public lines checked. Counts are of companies on usedby, not of the whole market: we list a company when a public page shows its AI tools.
63
companies on usedby use a tool of this category
Companies per tool. A company using two tools counts for both.
Counts include job-post signals, drawn apart on each tool page.
Companies with a public line for each tool. Job-post signals count and are drawn apart in the proof bar.
| # | Tool | Customers | Proof |
|---|---|---|---|
| 1 |  Superhuman | 32 | |
| 2 |  Shortwave | 22 | |
| 3 |  Fyxer AI | 12 |
3 companies run two of these tools or more. The most common pair is Shortwave with Superhuman, at 3 companies.
Superhuman32 customersSuperhuman is used by 32 companies on usedby, 15 confirmed by a case study, a named quote or a press release. Named customers include OpenAI, Zoom, and Netflix. Who uses Superhuman, Shortwave vs Superhuman
Customer page: superhuman.com. Latest check of 24 of 32 lines: Oct 3, 2026.
Shortwave22 customersShortwave is used by 22 companies on usedby, 15 confirmed by a case study, a named quote or a press release. Named customers include Github, Spotify, and Twilio. Who uses Shortwave, Shortwave vs Superhuman
Latest check of 22 of 22 lines: Oct 3, 2026.
Fyxer AI12 customersFyxer AI is used by 12 companies on usedby, 7 confirmed by a case study, a named quote or a press release. Named customers include Starbucks, AT&T, and ClickUp. Who uses Fyxer AI
Customer page: fyxer.com. Latest check of 12 of 12 lines: Oct 7, 2026.
Companies first listed by a tool of this category in the last 90 days.
Side-by-side pages with the companies behind each tool.
Answers drawn from usedby data.
Superhuman, used by 32 of the 63 companies on usedby in this category. Then come Shortwave (22) and Fyxer AI (12). Who uses Superhuman.
Superhuman: 32 companies on usedby, against 22 for Shortwave. 3 companies use both, counting confirmed and observed lines only.
Yes: 3 of the 63 companies on usedby in this category run two or more. The most common pair is Shortwave with Superhuman (3 companies).
By the number of companies with a public line for each tool, read from dated captures of vendor customer pages, case studies, press releases and job posts. Job-post signals count in the totals and are shown apart. usedby lists a company when a public page shows it, so these counts describe the companies on usedby, not the whole market.