#669BBF
Closest named color: Greyblue (#77A1B5). oklch(66.6% 0.078 239.2), rgb(102, 155, 191).
Aa
Black text reads best on this color (7.00:1).
About this color
#669BBF is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.078 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.033 away. Black text reads best on it, at 7.00:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.00:1 |
| White text | 2.99:1 |
Values
| HEX | #669BBF |
| RGB | rgb(102, 155, 191) |
| HSL | hsl(204, 41%, 57%) |
| OKLCH | oklch(66.6% 0.078 239.2) |
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 #669BBF | 2.99:1 | Fails | Lc -61.9 | Content text, not long reading |
| Black text on #669BBF | 7.00:1 | AAA | Lc 47.5 | Large or bold text, headings |
| #669BBF text on white | 2.99:1 | Fails | Lc 56.6 | Large or bold text, headings |
| #669BBF text on black | 7.00:1 | AAA | Lc -45.2 | 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 500.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CDDBE6
oklch(88.4% 0.021 241.4)
-
Step 300
300
#ABC5D7
oklch(81% 0.038 238.2)
-
Step 400
400
#7EA6C3
oklch(70.6% 0.061 240.2)
-
Step 500
500 (this color)
#669BBF
oklch(66.6% 0.078 239.2)
-
Step 600
600
#407AA0
oklch(55.7% 0.085 239.5)
-
Step 700
700
#316789
oklch(49.2% 0.079 238.8)
-
Step 800
800
#2A546F
oklch(42.8% 0.065 239)
-
Step 900
900
#27455A
oklch(37.7% 0.051 240.5)
-
Step 950
950
#172935
oklch(27.1% 0.033 238.8)
#669BBF 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) | #8B9AC1 | 0.045 |
| Deuteranopia (no green cones) | #7F91BE | 0.038 |
| Tritanopia (no blue cones) | #3EA4A7 | 0.062 |
| Achromatopsia (no color) | #959595 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #669BBF
#669BBF
oklch(66.6% 0.078 239.2)
- #B88963
#B88963
oklch(66.7% 0.078 59.9)
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 #669BBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.033
- Faded Blue #658CBB ΔE 0.042
- Silver Lake Blue #778DA9 ΔE 0.045
- Blue Grey #758DA3 ΔE 0.049
- Cool Gray #8D99AE ΔE 0.050
- Bluegrey #85A3B2 ΔE 0.050
- Bluey Grey #89A0B0 ΔE 0.051
- Cadet Blue #5F9EA0 ΔE 0.052
Use #669BBF 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.