#5181BD
Closest named color: Cool Blue (#4984B8). oklch(59.6% 0.106 254.7), rgb(81, 129, 189).
Aa
Black text reads best on this color (5.22:1).
About this color
#5181BD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.106 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.015 away. Black text reads best on it, at 5.22:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.22:1 |
| White text | 4.01:1 |
Values
| HEX | #5181BD |
| RGB | rgb(81, 129, 189) |
| HSL | hsl(213, 45%, 53%) |
| OKLCH | oklch(59.6% 0.106 254.7) |
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 #5181BD | 4.01:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #5181BD | 5.22:1 | AA | Lc 36.8 | Non-text elements, placeholder text |
| #5181BD text on white | 4.01:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #5181BD text on black | 5.22:1 | AA | Lc -34.3 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CDDBEC
oklch(88.6% 0.028 253.2)
-
Step 300
300
#AAC3E2
oklch(80.9% 0.052 253.9)
-
Step 400
400
#7DA3D4
oklch(70.6% 0.083 255.1)
-
Step 500
500 (this color)
#5181BD
oklch(59.6% 0.106 254.7)
-
Step 600
600
#4175B5
oklch(55.6% 0.115 254.7)
-
Step 700
700
#32629C
oklch(49.1% 0.107 254.5)
-
Step 800
800
#2A507F
oklch(42.7% 0.09 254.8)
-
Step 900
900
#274366
oklch(37.8% 0.069 254.8)
-
Step 950
950
#17273C
oklch(27% 0.045 255.6)
#5181BD 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) | #6884C0 | 0.029 |
| Deuteranopia (no green cones) | #5A7ABC | 0.020 |
| Tritanopia (no blue cones) | #008F96 | 0.094 |
| Achromatopsia (no color) | #7F7F7F | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5181BD
#5181BD
oklch(59.6% 0.106 254.7)
- #A4752B
#A4752B
oklch(59.7% 0.107 75)
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 #5181BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.015
- Steel Blue #4682B4 ΔE 0.019
- Off Blue #5684AE ΔE 0.027
- Dusty Blue #5A86AD ΔE 0.033
- Windows Blue #3778BF ΔE 0.038
- Faded Blue #658CBB ΔE 0.041
- Water Blue #0E87CC ΔE 0.043
- Stormy Blue #507B9C ΔE 0.051
Use #5181BD 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.