Thanks. I am adding this animation soon!

Sry, i am fixing it. I vibe-coded this website so there might be some bugs :<

Hi HN,

I built N-Back.net, a lightweight and responsive Dual N-Back task for working memory training.

I was frustrated by the clunky UI and heavy design of most existing n-back tools, so I made something clean, fast, and distraction-free. No login, no ads, no tracking – just cognitive training in your browser.

Key features: • Dual mode: visual + auditory • Adaptive difficulty: level up as you improve, drop down if needed • Dark mode and keyboard-only mode • Clearly differentiated letter sounds, carefully selected to avoid confusion • Performance tracker (WIP: I’m working on streaks and detailed history) • Mobile-friendly (works well on phones & tablets)

I’m planning to add: • Custom training modes (single-modality, color, etc.) • User-defined N range • Optional accounts for progress saving (but always optional)

Would love your feedback on: • UX flow and performance • Cognitive challenge balance • What would make you come back and use it regularly?

Site: https://n-back.net

Thanks for checking it out!

"do nothing" is too slow, need another key to hit to skip.

I would expect a final reaction time of under 100-200ms ideally?

Yes, I would also remove the automatic progression entirely. This should be driven by user input only.

I think it's part of the test to have to do it quickly.

Sorry, I meant I want to be able to do it faster. I don't want to be held up by an automatic progression.

the buttons jumping up and down when correct or incorrect is jarring on my smaller screen, forcing a constant space there or moving the message would be a smoother UX, in my opinion.

Thanks for your suggestion! I am fixing it soon

Agreed, came here to say the same

This is pretty great, thank you!

I didn't know about these types of tasks (N-Back) and this was a nice introduction to it.

Oh, I should really post it in the HN Show .... I don't know how to remove this post. Sorry about that...