#508AB5
Closest named color: Dusty Blue (#5A86AD). oklch(61.2% 0.09 242.3), rgb(80, 138, 181).
Aa
Black text reads best on this color (5.64:1).
About this color
#508AB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.090 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Blue (#5A86AD), ΔE 0.016 away. Black text reads best on it, at 5.64:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Dusty Blue (#5A86AD) |
| Black text | 5.64:1 |
| White text | 3.72:1 |
Values
| HEX | #508AB5 |
| RGB | rgb(80, 138, 181) |
| HSL | hsl(206, 41%, 51%) |
| OKLCH | oklch(61.2% 0.09 242.3) |
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 #508AB5 | 3.72:1 | AA large text | Lc -70.1 | Content text, not long reading |
| Black text on #508AB5 | 5.64:1 | AA | Lc 39.4 | Non-text elements, placeholder text |
| #508AB5 text on white | 3.72:1 | AA large text | Lc 64.6 | Content text, not long reading |
| #508AB5 text on black | 5.64:1 | AA | Lc -37.0 | Non-text elements, placeholder text |
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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CCDBE8
oklch(88.4% 0.024 244.2)
-
Step 300
300
#A9C5DB
oklch(81% 0.043 241.8)
-
Step 400
400
#7AA6C9
oklch(70.6% 0.07 242.9)
-
Step 500
500 (this color)
#508AB5
oklch(61.2% 0.09 242.3)
-
Step 600
600
#3979A7
oklch(55.5% 0.097 242.6)
-
Step 700
700
#2B6690
oklch(49.1% 0.091 242.8)
-
Step 800
800
#255374
oklch(42.6% 0.075 242.5)
-
Step 900
900
#23455E
oklch(37.7% 0.059 242.4)
-
Step 950
950
#152937
oklch(27.1% 0.037 240.5)
#508AB5 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) | #778AB7 | 0.045 |
| Deuteranopia (no green cones) | #6A80B4 | 0.037 |
| Tritanopia (no blue cones) | #009599 | 0.074 |
| Achromatopsia (no color) | #848484 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #508AB5
#508AB5
oklch(61.2% 0.09 242.3)
- #AA7749
#AA7749
oklch(61.1% 0.089 62)
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 #508AB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Blue #5A86AD ΔE 0.016
- Off Blue #5684AE ΔE 0.018
- Cool Blue #4984B8 ΔE 0.021
- Faded Blue #658CBB ΔE 0.026
- Steel Blue #4682B4 ΔE 0.026
- Blue NCS #118AB2 ΔE 0.039
- Silver Lake Blue #778DA9 ΔE 0.049
- Stormy Blue #507B9C ΔE 0.051
Use #508AB5 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.