#66A1BF
Closest named color: Greyblue (#77A1B5). oklch(68% 0.076 231.5), rgb(102, 161, 191).
Aa
Black text reads best on this color (7.41:1).
About this color
#66A1BF is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.076 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.022 away. Black text reads best on it, at 7.41:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.41:1 |
| White text | 2.83:1 |
Values
| HEX | #66A1BF |
| RGB | rgb(102, 161, 191) |
| HSL | hsl(200, 41%, 57%) |
| OKLCH | oklch(68% 0.076 231.5) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #66A1BF | 2.83:1 | Fails | Lc -59.5 | Large or bold text, headings |
| Black text on #66A1BF | 7.41:1 | AAA | Lc 49.8 | Large or bold text, headings |
| #66A1BF text on white | 2.83:1 | Fails | Lc 54.3 | Large or bold text, headings |
| #66A1BF text on black | 7.41:1 | AAA | Lc -47.6 | Large or bold text, headings |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 400.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C9DDE8
oklch(88.6% 0.026 231.7)
-
Step 300
300
#A3C7DA
oklch(81% 0.047 231.1)
-
Step 400
400 (this color)
#66A1BF
oklch(68% 0.076 231.5)
-
Step 500
500
#4394BA
oklch(63.2% 0.097 231.5)
-
Step 600
600
#1A7DA6
oklch(55.5% 0.106 232)
-
Step 700
700
#066A8E
oklch(49.2% 0.098 231)
-
Step 800
800
#0E5673
oklch(42.6% 0.081 231.4)
-
Step 900
900
#17475D
oklch(37.6% 0.063 231.9)
-
Step 950
950
#0F2A37
oklch(27.1% 0.041 231.9)
#66A1BF with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #929FC1 | 0.052 |
| Deuteranopia (no green cones) | #8695BF | 0.047 |
| Tritanopia (no blue cones) | #3DA9AB | 0.055 |
| Achromatopsia (no color) | #999999 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A1BF
#66A1BF
oklch(68% 0.076 231.5)
- #BE8B6D
#BE8B6D
oklch(67.9% 0.075 51.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #66A1BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.022
- Bluegrey #85A3B2 ΔE 0.040
- Bluey Grey #89A0B0 ΔE 0.043
- Cadet Blue #5F9EA0 ΔE 0.047
- Cool Gray #8D99AE ΔE 0.049
- Silver Lake Blue #778DA9 ΔE 0.057
- Faded Blue #658CBB ΔE 0.059
- Blue Grey #758DA3 ΔE 0.059
Use #66A1BF in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.