What powers 
readium.org?
Last seen Oct 2026 · 16 technologies across 12 categories
Analytics
Caching
CDN
Font scripts
JavaScript frameworks
JavaScript libraries
Miscellaneous
PaaS
Performance
Programming languages
UI frameworks
Webmail
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Nov 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| readium | #1 | 97 |
| lcp | #34 | 21 |
| readium lcp-compatible reading app | #4 | 2 |
| epub metadata | #8 | 1 |
| web origin | #8 | 1 |
| lcp to pdf | #9 | 1 |
| web origins | #9 | 1 |
| epub website | #40 | 1 |
| readium lcp | #11 | 0 |
| lcp stands for | #17 | 0 |
| kotlin substring | #25 | 0 |
| epub.js reader | #31 | 0 |
| lcpl file to pdf | #31 | 0 |
| locator definition | #33 | 0 |
| lcp pdf | #36 | 0 |
| kotlin index of | #51 | 0 |
| cloud epub reader | #54 | 0 |
| manifest typing | #56 | 0 |
| open source epub | #60 | 0 |
| http caching | #66 | 0 |
| cross platform ereader | #70 | 0 |
| epub viewer open source | #87 | 0 |
The site's top keywords in Google (US), with the visits each one is estimated to bring per month.
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 74% desktop
- 26% phone
United States
India
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
5.90 / 10 · ranked #116,766 of all domains
161 referring domains · OpenPageRank
Search traffic
130 est. monthly organic visits (US)
22 keywords in Google's top 30
Core Web Vitals
| LCP | 1.1 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 500 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: English
- CDN: Fastly
- Weight: 0.5 MB · 32 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Readium
From Wikidata (CC0).
Infrastructure
- Registered Jan 2012 (14 years) via Squarespace Domains II LLC, renews Jan 2027
- Hosted on Fastly (185.199.108.153)
- DNS: Cloudflare DNS
- Email: Google Workspace
- Email security: no SPF record, DMARC monitor only
- SSL: Let's Encrypt, RSA 2048, expires Jan 2027
- Common Crawl link graph: rank 41,254, 6 hosts
- Verified with: Google
DNS records as swept Nov 2026, certificate as seen Nov 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| playground.readium.org | 9 |
| readium.org | 9 |