Letterman AI on new websites
Newsletter creation and publishing platform with custom-domain archives.
Found via: StackScope Wider Web 128
Letterman AI appeared on about 120 new sites in the last 30 days.
These figures cover websites that went live since April 2026, not the web as a whole.
Get told when a new site ships with Letterman AI.
123 new sites with Letterman AI first seen in the last 30 days.
Stackdar watches every launch we detect and sends you the ones using Letterman AI, by email, Slack or webhook. On every plan, from £15 a month.
See how alerts workShare of new sites using Letterman AI
Each dot is one launch day. Line is the 7-day rolling average; weekly averages before July 2026. Chart starts at first detection.
The shaded areas were measured against a different set of sites, so the line can step there without Letterman AI itself changing.
Coverage details
Before the dashed line where the dots begin, the line is a weekly average. After it, the last 90 days are shown one day at a time.
Grey: before 8 July 2026, we only tracked launches from launch platforms. From that date we crawl the wider web as well.
Amber: 8 July to 10 September 2026, before we improved our infrastructure to index new sites much sooner, often on the day they go live. Sites found that early often haven't finished setting up, so anything usually added after launch reads lower from 10 September. We record each site as it was when we found it.
The share is a proportion of whatever we were tracking at the time. For a single continuous measure, switch to launch platforms.
What kind of sites use Letterman AI
43 sites with a known type, all time
Domain endings using Letterman AI
125 sites, all time
- .com 98.4%
- .net 0.8%
- .uk 0.8%
Publishing leaders
| Tool | % of sitesall time | % of categoryall time | ||
|---|---|---|---|---|
| #1 | – |
Substack
|
0.1% | 49.5% |
| #2 | – |
Open Journal Systems
|
<0.1% | 11.7% |
| #3 | ▲2 | Facebook Instant Articles | <0.1% | 4.6% |
| #4 | ▼1 | FeedBurner | <0.1% | 4.2% |
| #5 | ▼2 | Heyzine | <0.1% | 2.6% |
| … | ||||
| #8 | ▲51 | Letterman AI Current page | <0.1% | 2.0% |
Percentages show all-time adoption across the new sites we track: the share of all of them, and of the sites using any Publishing tool.Among September launches it ranked #7 in Publishing, up from #58 in August. All 143 in Publishing →
Often used with
| Tool | Sites | vs all new sites |
|---|---|---|
Nuxt
|
126 | 108x |
OpenResty
|
118 | 103x |
Vue.js
|
126 | 36x |
Tailwind CSS
|
122 | 3.9x |
Cloudflare DNS
|
116 | 3.0x |
Tools that turn up far more often on Letterman AI sites than on new sites in general, and how many times as common each one is there.
128 sites across the wider web use Letterman AI
None of them is a product launch we list individually, so there is nothing to show here. They still count towards the figures above. How StackScope Discovery works
The StackScope API serves all 128 sites using Letterman AI, filterable and exportable, from £15 a month.