Island vs Lettermail
Island vs Lettermail, compared side by side on 13 data points: what each one does, how big it is, what it has raised, the tech running each site, and what users report. We score both out of 100 on traction, team and visibility: Island is on 72/100 and Lettermail on 18/100.
Where each one leads
Island
- our overall score: 72/100 against 18/100
- headcount: 1,227 against 8
- LinkedIn following: 41,901 against 5,931
Lettermail
- agent readiness: 64/100 against 38/100
At a glance
| Measure | Island | Lettermail |
|---|---|---|
| What it is | Island builds the Enterprise Browser, a Chromium-based browser purpose-built for enterprises with built-in security controls, data governance, and act | An AI-first email workspace that automates busywork, helps achieve inbox zero, and maintains a human touch. |
| Category | Enterprise, Cybersecurity, Web Browser, Web Security | Email Productivity, AI Email Assistant, Workflow Automation, Inbox Management |
| Sells toBusiness model | B2B | B2B |
| Offering | Software | Software |
| Founded | 2020 | Not published |
| Headquarters | Dallas, United States | Not published |
| Status | Active | Active |
Size, funding and growth
| Measure | Island | Lettermail |
|---|---|---|
| Employees | 1,227 | 8 |
| Headcount growthLast 12 months | +53.8% | Not published |
| Total funding | $1.1B | Not published |
| Latest round | Secondary Transaction | Not published |
| Valuation | $5.0B | Not published |
| LinkedIn followers | 41,901 | 5,931 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Island | Lettermail |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 72/100 | 18/100 |
| Traction | 60/100 | 10/100 |
| Team | 90/100 | Not published |
| Search visibility | 58/100 | 31/100 |
| Quality | 78/100 | Not published |
| Agent readinessHow well an AI agent can read and act on the site | F (38/100) | C (64/100) |
| Domain ratingLink authority, 0-100 | 72/100 | Not published |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Island | Lettermail |
|---|---|---|
| CDN | Cloudflare | Cloudflare |
| CMS | Webflow | Framer |
| Analytics | Google Tag Manager | Not detected |
Island vs Lettermail: common questions
Which is better, Island or Lettermail?
On our 0-100 score Island rates higher (72/100 against 18/100). The score weights traction, team, visibility and profile completeness, so it reflects company strength rather than which product suits you. We compare the two on 13 data points above: read the rows that match what you are buying for.
How do Island and Lettermail compare on the numbers?
Island leads on our overall score (72/100 against 18/100), headcount (1,227 against 8), LinkedIn following (41,901 against 5,931). Lettermail leads on agent readiness (64/100 against 38/100).
Read the full Island review and pricing or the Lettermail review and pricing. You can also browse other Island alternatives we track.