#538BB1
Closest named color: Dusty Blue (#5A86AD). oklch(61.4% 0.083 239.7), rgb(83, 139, 177).
Aa
Black text reads best on this color (5.69:1).
About this color
#538BB1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.083 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Blue (#5A86AD), ΔE 0.015 away. Black text reads best on it, at 5.69:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Dusty Blue (#5A86AD) |
| Black text | 5.69:1 |
| White text | 3.68:1 |
Values
| HEX | #538BB1 |
| RGB | rgb(83, 139, 177) |
| HSL | hsl(204, 38%, 51%) |
| OKLCH | oklch(61.4% 0.083 239.7) |
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 #538BB1 | 3.68:1 | AA large text | Lc -69.8 | Content text, not long reading |
| Black text on #538BB1 | 5.69:1 | AA | Lc 39.8 | Non-text elements, placeholder text |
| #538BB1 text on white | 3.68:1 | AA large text | Lc 64.3 | Content text, not long reading |
| #538BB1 text on black | 5.69:1 | AA | Lc -37.3 | 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
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDCE7
oklch(88.6% 0.023 237.7)
-
Step 300
300
#AAC5D9
oklch(81% 0.041 240.1)
-
Step 400
400
#7BA7C5
oklch(70.8% 0.065 238.7)
-
Step 500
500 (this color)
#538BB1
oklch(61.4% 0.083 239.7)
-
Step 600
600
#3C7AA3
oklch(55.6% 0.09 240.1)
-
Step 700
700
#2D678B
oklch(49.2% 0.083 238.9)
-
Step 800
800
#275471
oklch(42.8% 0.069 239.4)
-
Step 900
900
#25455B
oklch(37.6% 0.054 240.3)
-
Step 950
950
#162935
oklch(27.1% 0.033 237.5)
#538BB1 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) | #7A8BB3 | 0.046 |
| Deuteranopia (no green cones) | #6D81B0 | 0.038 |
| Tritanopia (no blue cones) | #1A9598 | 0.067 |
| Achromatopsia (no color) | #858585 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #538BB1
#538BB1
oklch(61.4% 0.083 239.7)
- #A97850
#A97850
oklch(61.3% 0.083 59.6)
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 #538BB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Blue #5A86AD ΔE 0.015
- Off Blue #5684AE ΔE 0.019
- Faded Blue #658CBB ΔE 0.026
- Cool Blue #4984B8 ΔE 0.028
- Steel Blue #4682B4 ΔE 0.032
- Blue NCS #118AB2 ΔE 0.041
- Silver Lake Blue #778DA9 ΔE 0.044
- Blue Grey #758DA3 ΔE 0.044
Use #538BB1 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.