Generate Data
Faker
DataConstruct
Beeceptor
Fake Data
ExtendsClass JSON Generator
Smock-it
A realistic data generator to test your app

Certly.dev
Certmon.net
Whats My DNS
WhatIsMyIP.com
CertChime
Domain Trust Watch
Cert Monitor
Monitor SSL certificates, domain expiry, DNS health, and security headers with real-time alerts.

Which is more popular?
Based on our record, Mockaroo seems to be more popular. It has been mentioned 27 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | mockaroo.com | certnotify.com |
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What each product offers, as listed by its team.

Possible disadvantages
Walkthroughs and reviews on video.
Best Free Sample Data Generator - Mockaroo.com
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using Mockaroo and CertNotify. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

If you give it the rules to generate something, why can't it generate it? That's what something like Mockaroo[0] does. It's just more formal. That's pretty much what LLM training does, extracting patterns from a huge corpus of text. Then... - Source: Hacker News / over 1 year ago
A quick way to test this out is to use a tool like Mockaroo to generate some test data and then have a Glue Crawler analyse the data in S3 and create the required data catalog entries. - Source: dev.to / over 2 years ago
Mockaroo — Mockaroo lets you generate realistic test data in CSV, JSON, SQL, and Excel formats. You can also create mocks for back-end API. - Source: dev.to / over 2 years ago
Tracking CertNotify since Sep 2026.
When comparing Mockaroo and CertNotify, you can also consider the following products.

GenerateData.com: free, GNU-licensed, random custom data generator for testing software
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Monitor SSL certificates, domain expiry, and DNS/DNSSEC across all your sites. Track every DNS record change and get alerted on Slack, email, or webhook before anything lapses — so you never find out from your customers.
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Faker is a PHP library that generates fake data for you
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Get notified before your SSL certificates expire
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Instantly check your domain names current IP address and DNS record information against multiple name servers located in different parts of the world.
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