About Left Hand Trainer
Who makes this
My name is Dan W. I'm a developer and a PC gamer in the United States, and I build and run Left Hand Trainer on my own. There's no team, no studio and no publisher — every line of code, every guide and every reply to a support email comes from me. You can reach me directly at contact@lefthandtrainer.com.
Why it exists
I kept losing fights I should have won, and it was never my aim. It was the half-second where I meant to crouch and hit the wrong key, or reached for an ability and had to think about where it was. So I went looking for something to drill it with — and found nothing. There are dozens of aim trainers for the right hand. For the hand doing movement, abilities, weapon swaps and every interaction in the game, there was essentially nothing.
Typing tests were the closest thing, and they're the wrong tool: they train prose on the whole keyboard, at a rhythm nothing like a game. What I wanted was a drill for the cluster around WASD, under time pressure, that told me which specific keys were slow. So I wrote it. The first version was a single HTML file that flashed a letter and timed how long I took — it was ugly, and it immediately showed me that my 4 and C were embarrassing.
What it does now
Five training modes, key-set presets that match how FPS, MOBA and MMO games actually bind things — or a custom set you build key by key when your binds don't match anyone's preset — four difficulty levels with real reaction deadlines, and per-key millisecond stats rendered as a heatmap so you can see exactly which keys cost you time. There's a global leaderboard, a seeded daily challenge everyone plays the same version of, and a streamer overlay with a green-screen mode for OBS.
It runs entirely in your browser. There's no account, no download and no paywall, and it works offline once loaded.
How the guides are written
The guides are written by me, in one sitting each, and revised when I learn something that changes the advice. Two rules I hold myself to:
- Claims about human performance get a citation. When a guide says something about reaction time, motor learning or fatigue, it links to the published research it came from so you can check whether I've represented it fairly. Where the evidence is thin or contested, the guide says so rather than rounding it into a confident number.
- No invented statistics. I don't publish numbers about my own users unless they come from data I actually hold, with the sample size stated. If a figure isn't sourced, it isn't in the guide.
If you find an error — especially a cited study that doesn't support what I claim it does — email me and I'll correct it and date the correction.
Your data, plainly
Your scores, streaks and per-key reaction times live in your browser's local storage, on your device. They're never uploaded, which also means I can't recover them if you clear your browser. The only thing that ever leaves your machine is a leaderboard entry, and only when you type a name and press Submit. The full detail is in the privacy policy.
How it's funded
Two ways, both disclosed: advertising served by Google AdSense, and voluntary tips through Ko-fi. That's it. No guide on this site has ever been sponsored, and no hardware or game company has paid for a mention. If that ever changes, it'll be disclosed at the top of the article involved. The trainer itself will stay free — it costs me very little to run, and a paywall would defeat the point.
Get in touch
Bug reports, feature requests, corrections, leaderboard removals or just to tell me your slowest key: contact@lefthandtrainer.com. More detail on what I can and can't help with is on the contact page.