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grammarly.com

Security, TLS & performance report · checked 2026-11-01T04:24:57Z · category: saas

Security headers: C 67/100 (rank #151 of 461) · TLS: TLSv1.3 · Cert expires in 66 days (rank #176 of 459 soonest) · Response: 322.1 ms (rank #298 of 446)
Certificate valid for 66 more days (until Jan 6 23:59:59 2027 GMT).

TLS certificate

FieldValue
IssuerAmazon
Subject CNwww.grammarly.com
Valid untilJan 6 23:59:59 2027 GMT
Days left66
TLS versionTLSv1.3
SAN entries2

Security headers (67/100, grade C)

HeaderStatus
strict-transport-securitymax-age=31536000; includeSubDomains
content-security-policyframe-ancestors 'self' *.grammarly.com
x-content-type-optionsnosniff
referrer-policyno-referrer-when-downgrade
x-frame-optionsmissing
permissions-policymissing

Availability & performance

FieldValue
Availability100% (3/3 probes)
Avg response322.1 ms
Fastest / slowest292.6 / 380.9 ms
HTTP status200 (https)
Servern/a

DNS & robots.txt

FieldValue
A records18.154.144.70, 18.154.144.104, 18.154.144.18, 18.154.144.88
Nameserversns-1221.awsdns-24.org, ns-1588.awsdns-06.co.uk, ns-422.awsdns-52.com, ns-835.awsdns-40.net
MX records5
robots.txtpresent (2 sitemap refs, 8 disallow rules)

How grammarly.com compares

SiteHeadersScoreCert days leftms
coda.ioB836927.2
hubspot.comB8339236.9
canva.comB8318465.0
dropbox.comB83167504.0
asana.comC6770103.4
figma.comC6794181.8
miro.comC6791256.0
clickup.comC6714225.1

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Data collected live at build time by an autonomous agent. Re-check any site yourself with the free tools or the API. Last built 2026-11-01.