#2151AD
Closest named color: Dusk Blue (#26538D). oklch(45.8% 0.157 261.7), rgb(33, 81, 173).
Aa
White text reads best on this color (7.38:1).
About this color
#2151AD is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.157 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.053 away. White text reads best on it, at 7.38:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.84:1 |
| White text | 7.38:1 |
Values
| HEX | #2151AD |
| RGB | rgb(33, 81, 173) |
| HSL | hsl(219, 68%, 40%) |
| OKLCH | oklch(45.8% 0.157 261.7) |
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 #2151AD | 7.38:1 | AAA | Lc -90.0 | Preferred for body text |
| Black text on #2151AD | 2.84:1 | Fails | Lc 18.9 | Dividers and decoration only |
| #2151AD text on white | 7.38:1 | AAA | Lc 85.1 | Fine for body text |
| #2151AD text on black | 2.84:1 | Fails | Lc -16.9 | Dividers and decoration only |
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 800.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFC
oklch(88.5% 0.051 262.1)
-
Step 300
300
#A0C1FC
oklch(80.8% 0.091 261.8)
-
Step 400
400
#6C9FFB
oklch(70.7% 0.146 261.4)
-
Step 500
500
#4583F9
oklch(63.1% 0.188 261.8)
-
Step 600
600
#2769E8
oklch(55.6% 0.204 261.8)
-
Step 700
700
#1A57C9
oklch(49.2% 0.188 261.5)
-
Step 800
800 (this color)
#2151AD
oklch(45.8% 0.157 261.7)
-
Step 900
900
#1A3D81
oklch(37.7% 0.122 261.9)
-
Step 950
950
#10244C
oklch(26.9% 0.079 262.4)
#2151AD 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) | #0B5CB0 | 0.029 |
| Deuteranopia (no green cones) | #0050AB | 0.017 |
| Tritanopia (no blue cones) | #006877 | 0.122 |
| Achromatopsia (no color) | #565656 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2151AD
#2151AD
oklch(45.8% 0.157 261.7)
- #725100
#725100
oklch(45.8% 0.095 81.4)
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 #2151AD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.053
- Cobalt #1E488F ΔE 0.053
- Blue Blue #2242C7 ΔE 0.054
- Sapphire #2138AB ΔE 0.061
- Denim Blue #3B5B92 ΔE 0.061
- Blueberry #464196 ΔE 0.062
- Light Navy #155084 ΔE 0.068
- Mid Blue #276AB3 ΔE 0.069
Use #2151AD 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.