
CodeSignal
Codility
HackerRank
HackerEarth
coderpad
eSkill
iMocha
Technology for IT skill testing. Solution dedicated to automated skill testing in recruitment, programming contests and education.
SQL Fiddle
ExtendsClass SQL Online
OnlineGDB
Judge0 IDE
JDoodle
replit
DB Fiddle
Online compiler for many languages, including MySQL

Which is more popular?
Based on our record, Rextester seems to be more popular. It has been mentioned 7 times since March 2021.
Website, pricing, platforms and company facts side by side.
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Rextester
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| Website | sphere-engine.com | insurance.rextester.com |
| Pricing | — | |
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using Sphere Engine and Rextester. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.

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It supports around 30 languages including Java, but it is more popular among C# users. Rextester started as a Regular Expression Tester, later grew to be an online IDE.
Recommendations tracked on public social media and blogs since March 2021.

Tracking Sphere Engine since Mar 2021.
My Professor has not provided any resources or material to help complete this project, I have tried to problem solve, use the internet, even chatgpt. (I can send the code that it gave me in comments if needed, but ) I need help... Source: over 3 years ago
Does it really do that? (I've just tried in rextester.com, it complains about declared but unused variables.). Source: almost 4 years ago
(A quick survey of some of the languages at rextester.com showed that they are usually counted from 1. I'd suggest doing the same would be least surprising.). Source: over 4 years ago
When comparing Sphere Engine and Rextester, you can also consider the following products.

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A tool for easy online testing and sharing of database problems and their solutions.
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Codility provides a SaaS platform with advanced validation, security and protection features to evaluate the skills of software engineers.
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Online SQL playground for testing and sharing SQL snippets. SQLite, MySQL and PostgreSQL.
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HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
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OnlineGDB.com is an online compiler and debugger tool for C/C++.
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