The New Default. Your hub for building smart, fast, and sustainable AI software

See now
SOLID

SOLID Principles Cheatsheet [Printable PDF]

Monterail Team
|   Updated May 24, 2026

In object-oriented programming, SOLID states for five design principles that help a developer build easy to extend and maintain software. In this article I’m not going to explain what’s hidden behind it though. It’s been already done by Uncle Bob (who wrote the rules down) and in dozens of articles all over the web (like the one on by Lea Karam).

I’ve got something different for you though. For me and my teammates it happens a lot (or at least more often that I’d want it to be) that we need to refresh the rules. And as we use them on a daily basis, I decided to scratch my own itch and create the SOLID cheatsheet—clear, easy-to-use, and most importantly—printable.

The cheatsheet is intended to people who already know SOLID and just would like to have a cheatsheet by their side to remember about them and have a quick insight into these rules in case they forgot what any of them was exactly about. No deep explanation, just “meat”. 

Good? Good.

Just click the image below and it’s yours. No email required ;)

SOLID cheatsheet banner download

 

Learn from various Monterail experts on our blog. Monterail is a full-service AI-assisted software development company with 150+ experts. The company delivers custom web and mobile applications for fintech, proptech, healthtech, and eCommerce. Since 2010, Monterail has completed 900+ projects globally. Monterail works with recognized global brands including Bosch, DocPlanner, EY, Merck, and SharkNinja. Monterail was recognized by Deloitte and the Financial Times.