What technology does crontab.guru use?

We did not detect any specific technologies for crontab.guru in the latest scan.

Is crontab.guru secure (HTTPS)?

Yes. crontab.guru uses TLS 1.3 with a certificate issued by Amazon, valid until Jan 31, 2027.

Who hosts crontab.guru?

Hosting provider information for crontab.guru is not available yet.

What is crontab.guru's SEO score?

crontab.guru scored 75/100 for SEO in the latest analysis (fair).

What is crontab.guru's overall website score?

crontab.guru has an overall SiteGraph score of 79/100, combining SEO, performance, security, and accessibility.

crontab.guru

Crontab.guru - The cron schedule expression generator

Last scanned Jul 26, 2026, 5:47 AM

Overall score

Fair

Summary

An easy to use editor for crontab schedules. SEO is good (75/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance good (80/100). Top issue: Missing canonical link.

An easy to use editor for crontab schedules.

Top issues to fix

10 issues found · 3 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Slow estimated load (4.2s)
Performance
Use a CDN, enable caching/compression, and cut render-blocking assets — every extra second costs conversions.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.

+4 more issues — details in the sections below.

SEO

4 issue(s) found

Performance

4.16 s

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

An easy to use editor for crontab schedules.

Meta tags

Title: Crontab.guru - The cron schedule expression generator
Description: An easy to use editor for crontab schedules.
Canonical
Language: en
Charset: utf-8
Viewport: width=device-width, initial-scale=1.0
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

No technologies detected.

Hosting & CDN

Hosting provider: —
CDN provider: CloudFront
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Amazon
Subject: *.crontab.guru
Valid from: Jul 18, 2026
Valid to: Jan 31, 2027
Days until expiry: 187
SAN domains: *.crontab.guru, crontab.guru

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyMissing
X-Frame-OptionsMissing
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 2 · H3 2

Links

3 internal · 10 external · 13 broken

Images

2 total · 0 missing alt

Scripts / Styles

6 scripts · 1 stylesheets

JS / CSS size

3.3 KB · 0 B

Page size

16.3 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Missing canonical link
No structured data (JSON-LD) found
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://crontab.guru
Final URL: https://crontab.guru
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 4.16 s
HTML size: 16.3 KB
Redirect chain: https://crontab.guru

See something wrong on this report? Request a correction

Frequently asked questions

What technology does crontab.guru use?: We did not detect any specific technologies for crontab.guru in the latest scan.
Is crontab.guru secure (HTTPS)?: Yes. crontab.guru uses TLS 1.3 with a certificate issued by Amazon, valid until Jan 31, 2027.
Who hosts crontab.guru?: Hosting provider information for crontab.guru is not available yet.
What is crontab.guru's SEO score?: crontab.guru scored 75/100 for SEO in the latest analysis (fair).
What is crontab.guru's overall website score?: crontab.guru has an overall SiteGraph score of 79/100, combining SEO, performance, security, and accessibility.