#5181AB
Closest named color: Off Blue (#5684AE). oklch(58.7% 0.083 246.2), rgb(81, 129, 171).
Aa
Black text reads best on this color (5.07:1).
About this color
#5181AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.083 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.011 away. Black text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 5.07:1 |
| White text | 4.13:1 |
Values
| HEX | #5181AB |
| RGB | rgb(81, 129, 171) |
| HSL | hsl(208, 36%, 49%) |
| OKLCH | oklch(58.7% 0.083 246.2) |
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 #5181AB | 4.13:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #5181AB | 5.07:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #5181AB text on white | 4.13:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #5181AB text on black | 5.07:1 | AA | Lc -33.3 | 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 600.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE6
oklch(88.5% 0.021 243.4)
-
Step 300
300
#AEC4D8
oklch(81% 0.037 245.7)
-
Step 400
400
#82A5C4
oklch(70.7% 0.06 245.5)
-
Step 500
500
#628EB5
oklch(63% 0.076 246.1)
-
Step 600
600 (this color)
#5181AB
oklch(58.7% 0.083 246.2)
-
Step 700
700
#39658A
oklch(49.2% 0.077 245.6)
-
Step 800
800
#305270
oklch(42.6% 0.064 246.6)
-
Step 900
900
#2B445B
oklch(37.7% 0.05 247.3)
-
Step 950
950
#192835
oklch(27% 0.032 245.5)
#5181AB 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) | #6F82AD | 0.037 |
| Deuteranopia (no green cones) | #6479AA | 0.029 |
| Tritanopia (no blue cones) | #1F8B8F | 0.071 |
| Achromatopsia (no color) | #7D7D7D | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5181AB
#5181AB
oklch(58.7% 0.083 246.2)
- #9E7244
#9E7244
oklch(58.7% 0.083 66.2)
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 #5181AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.011
- Steel Blue #4682B4 ΔE 0.016
- Dusty Blue #5A86AD ΔE 0.018
- Cool Blue #4984B8 ΔE 0.020
- Stormy Blue #507B9C ΔE 0.026
- Cerulean #457B9D ΔE 0.030
- Dull Blue #49759C ΔE 0.040
- Blue NCS #118AB2 ΔE 0.042
Use #5181AB 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.