A modern take on Matthias Wandel's classic [0], which has you guess a variety of geometric attributes (e.g. angle bisection, centroid locating, shape regularization), not just simple partitioning of a line.

[0] https://woodgears.ca/eyeball/index.html

• kerblang

  today at 5:10 PM

  Oh that version actually made sense.

  Going back to our newer game, I realized that I am supposed to figure out where the number given should fall on the line.

  A case study in modern useability - looks a lot cooler, can't figure it out.

• stronglikedan

  today at 3:18 PM

  This is great. If only the little square tool would disappear while I make adjustments though - it's just enough of a distraction to barely miss.

• mrroryflint

  today at 2:49 PM

  Oh wow - that is very cool. Thanks for sharing.

  • harrisi

    today at 3:52 PM

    Just want to say thank you for sharing your project. Very fun, and I wouldn't know about Matthias Wandel's version if not for yours!

    Also, both of these tickled my brain in a great way. I think a potentially fun continuation would be to "eyeball" physics. For example, throw a ball and pause the physics before it hits something (ground, object, who knows?) and guess the location. Or show two objects about to collide with certain shapes and masses and guess what one of them will hit first and where.

Note the "share" link doesn't share a specific challenge for others to try, which would be much cooler, instead it just shares to main page

I thought I was going to be really good at this but turns out I'm surprisingly bad. Cool idea.

Love it!

It would be great to have a 'training' mode, where you get to repeat ones you miss. This would increase the learning speed.

Easy training- repeat the one you just borked Medium training- cycles through say 5 examples until you get all five within your target range (1%, 0.1%, whatever)

• mrroryflint

  today at 1:19 PM

  Cool idea - thanks! I'm building a mobile app as we speak so I'll add it for sure.

Got a perfect result for the first try. (Off by zero.) Not trying again. :)

I was 0.06% off on eyeball. Beat me: https://eyeball.rory.codes.

This is fun!

• pelagicAustral

  today at 2:39 PM

  > perfect - you picked 0 · off by 1 (0.03%)

• layer8

  today at 3:20 PM

  0.10%, but on a touch screen.

  • tgamma

    today at 4:27 PM

    I was 0.00% off on eyeball. Beat me: https://eyeball.rory.codes

    Lucky punch, on a touch screen!

• Theodores

  today at 2:07 PM

  Almost: 0.07%, allegedly 'perfect'. Getting an early win makes the game so much more 'playable'.

  • stavros

    today at 2:32 PM

    Why does an early win matter? Isn't it random?

https://eyeball.rory.codes/ I was 0.20% off on eyeball. Beat me: https://eyeball.rory.codes

• today at 3:55 PM

• pravj

  today at 4:29 PM

  I reached 0.05% and retired for the day.

  https://postimg.cc/MXBQqrXf

It's interesting that there are, at the time I'm commenting, 11 new users commenting on this submission, some commenting multiple times. I wonder what the effect of "share my score" type pages have on account creation.

• hazelnut

  today at 4:55 PM

  yes, was thinking the same. but it's also weird that the amount of new users commenting is so much higher here. wonder if that is just not a coincidence.

My best on first attempt was 0.00% (Pure coincidence) . But was fun!

The fact that the numbers are in a brighter color than the end marks, and that the numbers go inwards, makes it slightly more difficult than it would otherwise be, because the eye is biased by the more prominent space between the numbers being different from the line between the marks.

I love these simple games that take 2 seconds to understand the rules.

Off by 6 on my iPad by mis-clicking. Very satisfying!

• mrroryflint

  today at 5:04 PM

  Thank you!

Nice! Would be nice to see your progress over time (if you got better, also as a function of speed...)

0.11% by luck, because I actually got lucky the target number was too close to zero, out of a big scale.

Great idea! Have you considered storing triplets <range, correct number, selected number> for each try and making image plots of these (x/y coordinates are correct/selected numbers, color of each pixel represents frequency) for multiple users for each range? I think the image might reveal interesting properties of human eyeballing, like near-perfect accuracy around 50%, but with less obvious correlations.

• mrroryflint

  today at 2:48 PM

  Very cool idea! Will try and add.

I love these kind ones! Really engaging also yes as someone commented, the training mode would be an awesome idea.

Also, I tried this on laptop as well as my phone, I liked it more on my phone (I know the whole point is about precision though)

• mrroryflint

  today at 1:41 PM

  I'm* building an app currently!

  *my old pal Claude

This is fun but you need to put "click the line" higher on the page. It took me a while to figure out what I was looking at.

• oneeyedpigeon

  today at 2:02 PM

  Just any kind of contrast between foreground and background would help.

• ketul_shah

  today at 11:24 AM

  same happened to myself as well.

The low contrast of this website hurts my eyeball

Cool idea, love how simple it is. Minimal and clean.

Well I suck.

• mrroryflint

  today at 4:21 PM

  I built it and still suck, don’t feel so bad.

Definitely need an iOS version! An angle version on a circle would be nice too.

• mrroryflint

  today at 2:17 PM

  Just wrapping up the beta for iOS! Will let you know asap.

• tantalor

  today at 2:29 PM

  What does native give you that this doesn't?

10 round avg 4.5%.

A time limit would make sense imho. For extra challenge, add diagonal or curved lines.

I didn't think I'd be any good at this. What I didn't expect is how wildly inaccurate I'd be on every single goddamn attempt lmao it's like I completely lack whatever part of your brain is required to do this

Oh, this is actually fun! How about if you change the target every few seconds to add a bit of pressure.

10 perfect hits in a row!

...

handleClick({clientX: els.bar.getBoundingClientRect().left + els.bar.getBoundingClientRect().width / state.n * state.target })

800

0 out of 1,600

I still missed. Even when there was centered text.

Maybe the human is the weakest link

this is fun and helping me get grounded :). adding a timer would be a good idea, I think.

love it, pulls you in after a first try)

Simple premise, oddly hard to put down.

Really fun! I am pretty much blind

i got a 0.00% after 3 tries!

this was fun

this is fun!

pretty fun!

i made 0.87%

my best is 0.08%

• zer0tonin

  today at 10:43 AM

  > I was 0.00% off on eyeball. Beat me: https://eyeball.rory.codes

  (It was pure luck)

my avg was around 2% not able to do more than that lol