The Codeforces BlitzCup format felt very exciting and competitive.
Inspired by that, we explored whether similar real-time 1v1 coding platforms exist. While some options were available, none delivered the experience we were looking for, so we decided to build our own.
Introducing Blitz1v1
Blitz1v1 is a real-time competitive coding platform designed for 1v1 Codeforces-style duels where two players solve the same problem simultaneously and compete for the fastest correct submission.
Key Features:
- Real-time 1v1 coding duels.
- Arenas and tournament brackets.
- Live pairing: instantly match with available opponents for immediate duels.
- A global Open Challenge where anyone can join, chat in real time, adjust configs, and accept.
- Direct Challenge to anyone via Open Challenge.
- Integration with Codeforces API for automatic submission validation
- Fair play mechanisms such as problem locking and timed rounds.
- Instant live desktop notification when a problem is solved
- Live spectator mode with low-latency updates via WebSockets
- Head-to-head analytics, leaderboards, and player profiles.
- Full record of previous matches and completed tournament brackets
Would love to hear your thoughts and feedback.
Start playing on Blitz1v1 today!!
Amazing site. Smoother experience. Highly recommended.
Thanks Ayon!
I think it’s one of the best site for 1v1 blitz. First thing I notice its smooth and fast. Second one its choose good problem. Highly recommended.
Thanks for your feedback!
Going to test it and give my feedback ...
MishkatIT could u help me login , I typed my handler and a password , I even solved a problem sugested and nothing seems to work .
Alright, instead of solving the problem, you need to submit a compilation error to the generated problem. for example, type "hello" and submit it...
Alright, instead of solving the problem, you need to submit a compilation error to the assigned problem. For example, type "hello" and submit it...
I see , this worked for me and I might say that you've done a great job you and the team. Congrats
Thank you!
broooo, this is a great project, very good implementation, but you won't believe it, but I also had such an idea and I was at the development stage, it's sad that I didn't have time to finish it before you. Good luck
Really appreciate it! You should definitely continue yours too, different approaches can still turn into something awesome.
I have a question, is this site official? I mean if I sign in with my handle and my Password, may my account get hacked?
You can choose any password you like, and your Blitz1v1 account is not linked to your Codeforces account. The only requirement during signup is to submit a CE (Compilation Error) to verify your handle—that’s all :)
Ok nice I get it, thanks for your explanation ,I thought you could hack us :) .
Haha that gave me a laugh, don’t worry.
One tiny note, is that problems can be repeated, so it will be better if selected problems are sure that no one of participants solved before.
Noted.
We’ll consider including this feature.
Also of possible to support several platforms like atcoder, since it has a very good base of problems that just about pattern recognition.
ok, we'll try this.
vai, rating wise problem selection useful for low rated like me
enjoy!
New Feature Just Dropped.
Join the Open Challenge
Give It a Try!
Wow! Great feature indeed!
enjoy!
Extended that Challenge feature, now you can directly challenge anyone to a challenge
This just made the site so much better!
Enjoy!
As a contributor, I can confidently say that this Blitz1v1 website is an excellent platform for engaging in 1v1 matches.
Hello World, Join Blitz1v1
how can i change password if i forget mine
In that case, please log out and use the " Forgotten password? " option on the login.
Nice, Bhaiya! Now programmers can have 1v1 competitions.
Thank you! join Blitz1v1 and share it with your friends..
insane work gj! i think you can improve it by adding a section for a 2v2 / 3v3 / 4v4 i tried it before and i it was really fun
Glad you liked it!
I’ll consider adding 2v2 / 3v3, it sounds really fun.
The overall experience is good, but what is about the "break" in between problems . I seriously think that should be removed it ruins the experience of duel. And if possible change the UI to more minimal like CF.
Thanks for your feedback! We’ll consider your points about the break and the UI.
Added light theme support
Added a toggle button to switch between dark, light, and system themes