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openstax.org

https://openstax.org· First analyzed 17 Feb 2026· Updated 17 Feb 2026
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openstax.org

Sponsored

Hosting Provider

aws.amazon.com

IP Address

18.165.140.78

Server Location

🇫🇮 Helsinki, Finland

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

AmazonS3

CDN

CloudFront

Nameservers

ns-602.awsdns-11.net.ns-1195.awsdns-21.org.ns-2027.awsdns-61.co.uk.ns-358.awsdns-44.com.

Performance

Page Speed

568 KB
150 requests

Image Optimization

WebP
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Amazon Web Services (AWS)
CDN
CloudFront

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

10 Technologies Detected

SEO Analysis

B76/100
12
1
1
O
openstax.orgopenstax.org

OpenStax | Free Digital Textbooks and Teaching Tools

OpenStax offers free digital textbooks and affordable teaching technology for high school and college, helping educators save time and support student success.

Title Length52 chars

Recommended: 50-60 chars

Description Length159 chars

Recommended: 120-160 chars

Issues (1)

  • Many images missing alt text (11/19)

Crawlability

Sitemap

Type: standard

627 URLs

robots.txt

19 rules

Sitemap reference found

Sponsored

Sponsored

B

Security Score

71%Good
Static / Informational

HTTPS

WAF

266d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

12.10.2025

Valid Until

10.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

openstax.org*.openstax.org

SHA-256 Fingerprint

21:24:31:83:C6:D7:2B:F8:8D:BA:D4:C5:A9:33:EF:2C:33:F5:39:D0...

Recommendations

Security recommendation preview

HTTP Headers

Developer Console

cache-control
🟡 60s(public,max-age=60)
content-encoding
📦 Gzip(gzip)
content-type
text/html
date
Tue, 17 Feb 2026 01:24:23 GMT
etag
W/"aaef4d4cfcd4ba46fa0509eeb03dfc13"
last-modified
Tue, 16 Dec 2025 06:05:44 GMT
Good Warning Issue

Email Infrastructure

Google Workspace

Score

90

SPF
DKIM
DMARC

DMARC Policy

None (Monitor Only)

MX Records (7)

aspmx.l.google.com
alt2.aspmx.l.google.com
aspmx2.googlemail.com
alt1.aspmx.l.google.com

+3 more

Domain Information

openstax.org

Domain Age
14y 4m

Created

27.09.2011

Expires

27.09.2032

Last Updated

25.06.2024

Registrar

GoDaddy.com, LLC

DNSSEC
Not Enabled

Privacy & Compliance

CookieYes

Cookie Consent Banner
CookieYes
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: CookieYes
Privacy policy page linked

Typography & Readability

Neue Helvetica W01

88/100
Readability
/30
40/40

16px · LH 1.56

Hierarchy
/20
25/25

3x ratio

WCAG
/25
15/15

Contrast: undefined

Performance
/25
13/20

1 font

Heading Font

Neue Helvetica W01

Sans48px

Body Font

Neue Helvetica W01

Sans16px

Contrast Ratio

--

Reading Comfort

~34 CPL

Needs attention
48px
h1
24px
h2
24px
h3
16px
p

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.56 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.0x larger than body text.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

Business & Marketing Stack

7 Tools Detected

Enterprise

Behavior Analytics

4

User behavior and product analytics

Advertising

2

Ad platforms and retargeting pixels

Privacy & Cookies

1

Cookie consent and privacy compliance tools

3

Categories

7

Total Tools

1

Enterprise

2

Mid-Market

Assessment: Sophisticated marketing and sales technology infrastructure

Sponsored

Scripts & Styles

20 Resources

20
Scripts
0
Styles
15
Async
5
Defer

Top Script Sources

googletagmanager.com(6)local(5)connect.facebook.net(2)googleads.g.doubleclick.net(2)js.pulseinsights.com(1)

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Last analyzed: 17 Feb 2026 at 01:24

Historical Analysis & Change Tracking