Letter on new websites
Coding agent and harness for growth engineering that reads a site and its market and builds growth work.
- Sites using Letter
- 49
- since Jul 2026
- Last 30 days
- 45
-
new sites, to Nov 12
2 in the 30 days before - Last 7 days
- 43
-
new sites
2 in the week before
| First seen | Jul 17, 2026 |
|---|---|
| Last seen | Nov 13, 2026 |
| Website | letter.dev |
What we found
- Letter appeared on about 45 new sites in the last 30 days.[1]
- Almost all new Letter sites also use Next.js.
New sites using Letter, week by week
Each bar counts the new sites we found using Letter in one week, since 10 September. Paler bars cover only part of a week.
Who uses Letter
| Type | Sites | Share | Bar |
|---|---|---|---|
| Developer Tools | 11 | 39.3% | |
| Marketing | 5 | 17.9% | |
| Directory | 3 | 10.7% | |
| Health | 3 | 10.7% | |
| Hiring & HR | 3 | 10.7% | |
| Education | 2 | 7.1% | |
| Productivity | 1 | 3.6% |
| Ending | Sites | Share | Bar |
|---|---|---|---|
| .org | 22 | 45.8% | |
| .com | 20 | 41.7% | |
| .co | 2 | 4.2% | |
| .dev | 2 | 4.2% | |
| .ai | 1 | 2.1% | |
| .io | 1 | 2.1% |
Marketing on new sites
| # | Movement | Tool | Share of category | Bar | |
|---|---|---|---|---|---|
| 1 | – |
Facebook Domain Verification
|
59.3% | ||
| 2 | – |
Apple Domain Verification
|
20.6% | ||
| 3 | – |
TikTok Domain Verification
|
4.6% | ||
| 4 | ▲1 |
Smartarget
|
1.5% | ||
| 5 | ▲1 |
POWR
|
1.4% | ||
| 6 | ▼2 | Systemic Digital | 1.3% | ||
| 7 | ▼3 |
CribFlyer
|
1.3% | ||
| 8 | ▲3 |
Solocal
|
0.8% | ||
| 9 | ▲1 |
POPConvert
|
0.7% | ||
| 10 | ▼4 |
Landingi
|
0.7% | ||
| 11 | ▲1 |
ReadySMB
|
0.5% | ||
| 12 | – |
Tonomo
|
0.5% | ||
| … | |||||
| 59 | ▼51 |
Letter
|
<0.1% | ||
All-time shares across the new sites we track: of all of them, and of the sites using any Marketing tool. Among October launches it ranked #229 in Marketing, down from #178 in September. All 835 in Marketing
Often used with Letter
| Tool | Sites with both | vs all new sites |
|---|---|---|
Caddy
|
43 | 28x |
Vercel DNS
|
47 | 27x |
Next.js
|
48 | 7.5x |
React
|
48 | 3.7x |
Tools that turn up far more often on Letter sites than on new sites in general, and how many times as common each one is there.
Recently launched products built on Letter
14 of the 49 sites using Letter are product launches we list individually. The other 35 are new business and personal sites: they count towards the figures above but are not listed here. A watch sends them to you.
Showing the most recent 12 of 14.
Watches, exports and the API give you all 49 sites using Letter, from £15 a month.
Notes
- These figures cover websites that went live since April 2026, not the web as a whole.
How this page is made
FirstSited looks at each new website near the day it goes live and records what it was built with. We do not go back later, so these figures describe what sites launch with, not what they run today. A site counts towards Letter when we detect Letter on it at that look.
Every share on this page is a proportion of the new sites we were tracking at the time. Sites we found across the wider web count towards the figures, but only product launches are listed by name. How we detect technologies · How we find new sites