Site Health Report Card

substack.com

  • Substack
  • Social · Newsletters
  • Online since 2017
  • Checked Sep 30, 2026

“Subscribe. Subscribe. Subscribe.”

Pica's take. Substack is light and quick, with few outside scripts and a home on Cloudflare. It asks you to subscribe roughly every scroll, but the house is tidy. Pica has a newsletter too. Just saying.

A95 / 100

Overall health

#25 of 100 sites graded

  • Largest paint

    2.2s

  • Page weight

    2.4 MB

  • Requests

    70

  • Third-party scripts

    5

  • Domain age

    9 yrs

  • Blocklists

    0 / 60

Timed by our own browser

Site Speed

A
95

In excellent shape.

Largest paint (LCP)
2.2s
First paint (FCP)
1.0s
Server response (TTFB)
220 ms
Layout shift (CLS)
0.02
Page weight
2.4 MB
Requests
70

Pica: Two and a half megabytes. Delivered to your inbox.

Run the Speed Test on substack.com

A look from the outside

Security Check

A
95

In excellent shape.

HTTPS everywhere
Yes
HSTS
Preloaded
TLS
1.3
Content Security Policy
Partial
Mixed content
None
Third-party scripts
5

Pica: Five outside scripts. Paid subscribers only.

Run the Hack Check on substack.com

What the internet says about it

Reputation Check

A-
91

In excellent shape.

Domain age
9 years
Blocklists
0 of 60
Malware reports
None
Email authentication
DMARC reject
Certificate
Valid · 80 days
Lookalike domains
Some

Pica: Nine years old. Everyone has one now.

Run the Tracker Check on substack.com

Is it in a good neighborhood?

Hosting Check

A+
100

In excellent shape.

Network
Cloudflare · AS13335
Content delivery
Cloudflare
IPv6
Yes
HTTP/3
Yes
Shared-IP neighbors
Shared edge, well kept
Flagged neighbors
0

Pica: Cloudflare. Nice mailbox.

Run the TTFB Check on substack.com

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How we grade. Four checks, weighted equally: speed timed by our own browser, a security look from the outside, public reputation signals, and the network the site lives on. A look from the outside is not a server audit.