Start the 4-minute test

Three tests, about 4 minutes, no account

Text size and contrast set to your eyes

EyeScore measures what you can see clearly, then personalizes websites to make reading easier.

Start the 4-minute test See the extension
EyeScoreActive
19pxText minimum
BoostContrast

Three tests, about four minutes. Nothing flashes and nothing is timed.

1

Text size test

Say which way the E points as it shrinks. Your minimum text is twice the smallest one you read.

Which way does the E point?

2

Contrast test

The same E fades until you lose it. Gray text gets darker if it's too faint for you.

Which way does the E point?

3

Color test

Four tiles, one slightly off. If one color direction is harder for you, color assist turns on.

Which tile is a different color?

Each setting comes from a published rule. Clear it with room to spare and nothing changes.

  • Text size

    Text height at least twice the smallest E you can read.

    Legge and Bigelow, 2011
  • Contrast

    Text contrast at least ten times the faintest E you see, never below four.

    Whittaker and Lovie-Kitchin, 1994
  • Color

    Your limits in three color directions, against reference limits.

    Cambridge Colour Test
  • Night

    Dark mode only if your limit there is better by 0.15 log units.

    Mars chart retest range
4.6px
Text minimum18px

The library opens at nine on weekdays.

Typical 16px text is 1.8× your limit, so EyeScore enlarges it to 18px.

EyeScore is not an eye exam and can't detect eye conditions. If reading has become harder for you, see an eye care professional.

Your settings on the websites you read

EyeScore adjusts text size and contrast while preserving website layouts wherever possible. When an adjustment can't be fully applied, it lets you know.

  • Turn it off on any site, and it remembers
  • Preview the original page at any time
  • Your results stay in your browser
See how each setting is chosen

Modes for night, glasses and each screen

Night check

The contrast test in light and dark mode, at night. Pages turn dark only if that's clearly better for you.

Light · 2.1%
Dark · 1.2%

No-glasses mode

Take the size test once without your glasses. One click then switches supported websites to that size.

EverydayYour settings NightDark · 80% No glassesAt least 27px FocusNarrower lines

A profile for each screen

A laptop and a monitor keep their own results, and EyeScore picks the right ones on each.

LaptopThis screen19px
Monitor2560 × 144016px
Living-room TV1920 × 108024px

Reading comfort check

Read a passage at your size and 15% bigger, side by side, and keep the one you prefer.

A

Sun and steady water.

B

Sun and steady water.

Take the test first

Questions

About the tests, your data and the extension.

Is EyeScore an eye exam?

No. It finds settings for this screen and can't detect eye conditions.

Where does EyeScore keep my results?

In your browser, on your own computer. Nothing is sent anywhere, and there's no account.

Does EyeScore cost anything?

No. The tests and the extension are free.

Will EyeScore break the websites I use?

It keeps each site's desktop layout and checks it after enlarging. You can turn it off on any site.

Why does EyeScore need full brightness?

Your limits depend on the screen, so the same brightness and distance keep results steady.