#90A4BB
Closest named color: Cool Steel (#97A7B3). oklch(71.1% 0.041 252), rgb(144, 164, 187).
Aa
Black text reads best on this color (8.21:1).
About this color
#90A4BB is a medium-light, muted blue. In OKLCH its lightness is 71%, its chroma 0.041 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Steel (#97A7B3), ΔE 0.019 away. Black text reads best on it, at 8.21:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Cool Steel (#97A7B3) |
| Black text | 8.21:1 |
| White text | 2.55:1 |
Values
| HEX | #90A4BB |
| RGB | rgb(144, 164, 187) |
| HSL | hsl(212, 24%, 65%) |
| OKLCH | oklch(71.1% 0.041 252) |
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 #90A4BB | 2.55:1 | Fails | Lc -55.2 | Large or bold text, headings |
| Black text on #90A4BB | 8.21:1 | AAA | Lc 54.0 | Large or bold text, headings |
| #90A4BB text on white | 2.55:1 | Fails | Lc 50.1 | Large or bold text, headings |
| #90A4BB text on black | 8.21:1 | AAA | Lc -51.9 | 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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D3DAE2
oklch(88.5% 0.013 251.6)
-
Step 300
300
#B5C2D1
oklch(80.9% 0.026 251.9)
-
Step 400
400 (this color)
#90A4BB
oklch(71.1% 0.041 252)
-
Step 500
500
#738CA8
oklch(63.1% 0.051 251.5)
-
Step 600
600
#5B7694
oklch(55.6% 0.057 251.5)
-
Step 700
700
#4B637E
oklch(49.1% 0.052 251.8)
-
Step 800
800
#3E5166
oklch(42.8% 0.042 251.3)
-
Step 900
900
#354353
oklch(37.7% 0.033 252.1)
-
Step 950
950
#1F2731
oklch(27% 0.022 254.2)
#90A4BB 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) | #9CA4BC | 0.016 |
| Deuteranopia (no green cones) | #97A0BB | 0.014 |
| Tritanopia (no blue cones) | #85A9AB | 0.035 |
| Achromatopsia (no color) | #A2A2A2 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #90A4BB
#90A4BB
oklch(71.1% 0.041 252)
- #B29E87
#B29E87
oklch(71.1% 0.04 71)
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 #90A4BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Steel #97A7B3 ΔE 0.019
- Bluegrey #85A3B2 ΔE 0.020
- Bluey Grey #89A0B0 ΔE 0.021
- Cool Grey #95A3A6 ΔE 0.030
- Cool Gray #8D99AE ΔE 0.032
- Greyblue #77A1B5 ΔE 0.034
- Pewter #96A8A1 ΔE 0.044
- Dark Gray #A9A9A9 ΔE 0.047
Use #90A4BB 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.