- Link Authority: 77/100 (very strong, high confidence).
- Web graph rank: #78 of 134,979,706 domains, the top 0.001% of all domains.
- 464,772 linking domains counted in MrKeyword data.
- 329,402 hostnames under github.io in the web graph.
- 5th of 38 open source and developer sites on MrKeyword's list.
What is github.io's domain authority?
github.io has a MrKeyword Link Authority of 77/100, a very strong score. The score comes from where github.io sits in MrKeyword's web graph (August–October 2026): it is #78 of 134,979,706 domains by PageRank, and Link Authority places that position on a 0–100 log curve, so the strongest domain scores 100.
This is MrKeyword's own metric, not Moz DA or Ahrefs DR (how the domain authority scores differ); how Link Authority is calculated gives both formulas.
How many websites link to github.io?
464,772 different domains link to github.io in MrKeyword's data, counting each linking website once however many links it has. That is the number SEO tools call referring domains. The web graph also lists 329,402 hostnames under github.io (subdomains such as www or blog count separately).
To see individual linking websites and anchor text, open the free backlink checker for github.io.
Which strong websites link to github.io?
The strongest linking domain MrKeyword's web graph shows for github.io is apple.com, with a Link Authority of 84. The table lists the 10 strongest by their own score.
Strongest domains linking to github.io
| Linking domain | Link Authority | Web graph rank |
|---|---|---|
| apple.com | 84 | #20 |
| adobe.com | 80 | #41 |
| amazon.com | 79 | #48 |
| dropbox.com | 75 | #111 |
| bing.com | 71 | #241 |
| atlassian.com | 70 | #294 |
| ahrefs.com | 69 | #311 |
| deloitte.com | 67 | #483 |
| chatgpt.com | 67 | #502 |
| canada.ca | 67 | #519 |
7 of the 10 strongest linking domains have a profile on MrKeyword's list too (apple.com, adobe.com, amazon.com, dropbox.com, bing.com, atlassian.com, canada.ca). None of them is in github.io's own group, open source and developer sites.
How does github.io compare with similar websites?
github.io is 5th of 38 open source and developer sites on MrKeyword's list by Link Authority, with 2 neighbours above it in the table below. The median Link Authority of those 38 open source and developer sites is 67, so github.io is 10 points above it.
github.io and its nearest peers
| Website | Link Authority | Web graph rank | Linking domains |
|---|---|---|---|
| mozilla.org | 78 | #62 | 847,719 |
| w3.org | 77 | #71 | 227,599 |
| github.io | 77 | #78 | 464,772 |
| creativecommons.org | 76 | #98 | 297,915 |
| apache.org | 75 | #109 | 71,191 |
See every profiled site on the domain authority list of popular websites, or compare your own site with any of these in the free domain authority checker.
What does a Link Authority of 77 mean?
A Link Authority of 77 is very strong: far ahead of almost every other website. Domains at this level are linked from a very wide spread of other sites; gaining more points usually takes links from other very strong domains. In plain numbers, github.io is in the top 0.001% of the 134,979,706 domains in the web graph.
To raise your own site's score, read how to increase domain authority; for the domains at the very top, see the most-linked websites of 2026. The authority list explains why the 0–100 scale is logarithmic.
Where does github.io's data come from?
Every number on github.io's profile is read from MrKeyword's web graph (August–October 2026). This version uses data imported on 31 October 2026. How MrKeyword collects and labels this data.