According to AlphaMoat, in September 2026 21st Agents SDK (21st.dev) received 2,397,548 monthly visits (+7.5% MoM) — ranked #392 of 18,341 AI websites with traffic data, and #44 of 1,821 in Programming; its largest market is India (15.7% of visits).
21st is a React and Tailwind CSS UI library created by design engineers, covering components, marketing blocks, templates, and themes.
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| Month | Monthly visits | MoM |
|---|---|---|
| 2026-01 | 756.0K | — |
| 2026-02 | 817.1K | +8.1% |
| 2026-03 | 1.7M | +106.5% |
| 2026-04 | 2.1M | +22.4% |
| 2026-05 | 2.4M | +17.4% |
| 2026-06 | 2.1M | -14.1% |
| 2026-07 | 2.3M | +8.9% |
| 2026-08 | 2.2M | -1.6% |
| 2026-09 | 2.4M | +7.5% |
According to AlphaMoat, 21st Agents SDK (21st.dev) received 2,397,548 visits (about 2.4M) in September 2026 (+7.5% month over month), ranking #392 of 18,341 AI websites with traffic data, and #44 in Programming.
Over the last 9 months, 21st Agents SDK’s monthly visits went from 756.0K in January 2026 to 2.4M in September 2026 — up 217.1% overall; traffic peaked in May 2026 (2.4M).
In September 2026, 21st Agents SDK’s largest markets by share of visits are India 15.7%, United States 15.1%, Brazil 12.2%.
In Programming, the other products with the most monthly visits are Guardio (46.6M), Wix AI Website Builder (30.5M), Lovable (29.9M), Cursor (21.5M), Netlify (16.3M).
Data month: 2026-09 · Visit figures are third-party traffic estimates aggregated monthly — best for scale and trends. Multiple domains of the same product are merged. See methodology.