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

Calendar With Islamic Dates
Omni Calculator
calculator.net
CalCon Calculator
CalculatorSpan
Time Calc
Calculate date differences, business days, deadlines, sleep windows and recurring spans. CalcSpan shows the assumptions and sources behind each result.

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 | calcspan.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
More videos
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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 CalcSpan. 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 CalcSpan since Aug 2026.
When comparing Mockaroo and CalcSpan, you can also consider the following products.

GenerateData.com: free, GNU-licensed, random custom data generator for testing software
Compare Generate Data to Mockaroo or CalcSpan:

Calendar With Islamic Dates is an elegant mobile application introduced by IslamGhar that provides you the Islamic calendar with the list of important dates and events.
Compare Calendar With Islamic Dates to Mockaroo or CalcSpan:

Faker is a PHP library that generates fake data for you
Compare Faker to Mockaroo or CalcSpan:

Helping you make rational decisions, one calculation at a time.
Compare Omni Calculator to Mockaroo or CalcSpan:


Online calculator for quick calculations, along with a large collection of calculators on math, finance, fitness, and more, each with related in-depth information.
Compare calculator.net to Mockaroo or CalcSpan: