CODSNotes available here!

CODS is a global community made for Chemistry Olympiad participants

Haven't joined the community yet? You can join here.

Our Mission is to make Competitive Chemistry more...


by leveling out the playing field of competitive chemistry, we hope to increase the standards of Chemistry Olympiads


to a wider audience. We run four annual competitions for anyone around the world to compete in and provide guides for anyone to get started.


for everyone by providing guides for all levels of participants. We also provide high quality custom study resources to asssist your journey.

What is CODSite for?

CODSite is an all-purpose website made for our community (competitive Chemistry enthusiasts). Everything on CODSite is free to use for anybody, no sign-ups or memberhsip required. We provide custom open educational resources such as lectures, detailed notes, useful websites, problem sets, guides, tools, and all of our past competition papers. Anything a chemistry freak could dream of lies within this website.

Open Educational Resources at CODSite


Made specially for the CODS community, these notes cover the fundamentals required for competitive Chemistry, from Atomic structures to Organic Chemistry.


Our staff is dedicated to writing guides for all levels. From introductory guides to those for the IChO level, there is a guide for anyone written by the best in the competitive chemistry scene.

Past Papers

All of our past competition papers are released to the public and can be accessed immediately. Click here to access our list of past exams.


We provide four annual chemistry competitions for anyone to participate. For more information:

Courses (WIP)

Made specifically for chemistry olympiad participants, these courses will go over the fundamentals required for competitive chemistry, providing a variety of practice problems and tips & tricks for competitors at any skill level.

CODSite was made by our community and staff members on the CODServer. If you would like to contribute, visit our Github

For inquiries, click here. For donations, contact

- CODS -