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Show HN: Eyeball

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

2 hours agoMontyCarloHall

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.

2 hours agostronglikedan

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

2 hours agomrroryflint

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.

an hour agoharrisi

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.

30 minutes agoharrisi

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.

5 minutes agohazelnut

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)

4 hours agoforlorn_mammoth

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

4 hours agomrroryflint

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

This is fun!

3 hours agodavidcollantes

0.10%, but on a touch screen.

2 hours agolayer8

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

2 hours agopelagicAustral

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

3 hours agoTheodores

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

2 hours agostavros
[deleted]
34 minutes ago

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

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

30 minutes agoMabusto

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

10 minutes agoHugsbox

The low contrast of this website hurts my eyeball

an hour agowolttam

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.

2 hours agolayer8

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

an hour agoschuhwerk

Well I suck.

40 minutes agoChaseraph

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

39 minutes agomrroryflint

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.

2 hours agothrowawaydudhdn

Very cool idea! Will try and add.

2 hours agomrroryflint

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

4 hours agopedromlsreis

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)

4 hours agoashm1104

I'm* building an app currently!

*my old pal Claude

3 hours agomrroryflint

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

3 hours agojoey9prints

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.

6 hours agozer0tonin

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

3 hours agooneeyedpigeon

same happened to myself as well.

6 hours agoketul_shah

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

3 hours agoantoine-codefly

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

3 hours agomrroryflint

What does native give you that this doesn't?

3 hours agotantalor

10 round avg 4.5%.

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

3 hours agozokier

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

2 hours agoFinanceFreddy

love it, pulls you in after a first try)

an hour agooastp

10 perfect hits in a row!

...

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

3 hours ago0x000xca0xfe

i got a 0.00% after 3 tries!

29 minutes agocdelsolar

800

0 out of 1,600

I still missed. Even when there was centered text.

Maybe the human is the weakest link

3 hours agoramon156

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

6 hours agoketul_shah

Really fun! I am pretty much blind

2 hours agoehsangazarr

Simple premise, oddly hard to put down.

2 hours agolbeyer

this was fun

2 hours agott_dev

pretty fun!

2 hours agoehsangazarr

this is fun!

7 hours agotrickybusiness

i made 0.87%

6 hours agoelliotJames548

my best is 0.08%

8 hours agonextma

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