#2155A4
Closest named color: Dusk Blue (#26538D). oklch(46% 0.139 258.9), rgb(33, 85, 164).
Aa
White text reads best on this color (7.24:1).
About this color
#2155A4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.139 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.037 away. White text reads best on it, at 7.24:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.90:1 |
| White text | 7.24:1 |
Values
| HEX | #2155A4 |
| RGB | rgb(33, 85, 164) |
| HSL | hsl(216, 66%, 39%) |
| OKLCH | oklch(46% 0.139 258.9) |
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 #2155A4 | 7.24:1 | AAA | Lc -89.6 | Fine for body text |
| Black text on #2155A4 | 2.90:1 | Fails | Lc 19.3 | Dividers and decoration only |
| #2155A4 text on white | 7.24:1 | AAA | Lc 84.7 | Fine for body text |
| #2155A4 text on black | 2.90:1 | Fails | Lc -17.3 | 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 700.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A7C2ED
oklch(80.9% 0.068 259.6)
-
Step 400
400
#77A2E4
oklch(70.8% 0.108 258.7)
-
Step 500
500
#5489DC
oklch(63.2% 0.138 259)
-
Step 600
600
#3871C9
oklch(55.6% 0.149 258.9)
-
Step 700
700 (this color)
#2155A4
oklch(46% 0.139 258.9)
-
Step 800
800
#244D8D
oklch(42.6% 0.116 259.1)
-
Step 900
900
#224171
oklch(37.8% 0.09 258.9)
-
Step 950
950
#152642
oklch(27% 0.057 259.9)
#2155A4 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) | #295DA7 | 0.024 |
| Deuteranopia (no green cones) | #0051A2 | 0.021 |
| Tritanopia (no blue cones) | #006874 | 0.108 |
| Achromatopsia (no color) | #575757 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2155A4
#2155A4
oklch(46% 0.139 258.9)
- #745000
#745000
oklch(45.9% 0.095 78.7)
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 #2155A4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.044
- Cobalt #1E488F ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.051
- Light Navy #155084 ΔE 0.055
- Dusky Blue #475F94 ΔE 0.059
- Deep Sea Blue #015482 ΔE 0.060
- Peacock Blue #016795 ΔE 0.061
Use #2155A4 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.