#155AA4
Closest named color: Dusk Blue (#26538D). oklch(46.8% 0.136 254.3), rgb(21, 90, 164).
Aa
White text reads best on this color (6.92:1).
About this color
#155AA4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.136 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.039 away. White text reads best on it, at 6.92:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 3.03:1 |
| White text | 6.92:1 |
Values
| HEX | #155AA4 |
| RGB | rgb(21, 90, 164) |
| HSL | hsl(211, 77%, 36%) |
| OKLCH | oklch(46.8% 0.136 254.3) |
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 #155AA4 | 6.92:1 | AA | Lc -88.5 | Fine for body text |
| Black text on #155AA4 | 3.03:1 | AA large text | Lc 20.6 | Dividers and decoration only |
| #155AA4 text on white | 6.92:1 | AA | Lc 83.5 | Fine for body text |
| #155AA4 text on black | 3.03:1 | AA large text | Lc -18.5 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C9DBF2
oklch(88.5% 0.037 254.6)
-
Step 300
300
#A4C3EB
oklch(80.8% 0.066 254.9)
-
Step 400
400
#72A4E1
oklch(70.8% 0.105 254)
-
Step 500
500
#4B8BD9
oklch(63% 0.135 254.6)
-
Step 600
600
#2B74C6
oklch(55.6% 0.146 254)
-
Step 700
700 (this color)
#155AA4
oklch(46.8% 0.136 254.3)
-
Step 800
800
#1B4F8B
oklch(42.7% 0.113 254.5)
-
Step 900
900
#1D426F
oklch(37.6% 0.088 254.8)
-
Step 950
950
#122741
oklch(27% 0.056 254.8)
#155AA4 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) | #3360A7 | 0.030 |
| Deuteranopia (no green cones) | #1254A3 | 0.017 |
| Tritanopia (no blue cones) | #006C77 | 0.102 |
| Achromatopsia (no color) | #5A5A5A | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155AA4
#155AA4
oklch(46.8% 0.136 254.3)
- #7B5000
#7B5000
oklch(46.8% 0.099 73.6)
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 #155AA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.039
- Denim Blue #3B5B92 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.048
- Peacock Blue #016795 ΔE 0.049
- Mid Blue #276AB3 ΔE 0.052
- Dusky Blue #475F94 ΔE 0.055
- Light Navy #155084 ΔE 0.056
- Cobalt #1E488F ΔE 0.057
Use #155AA4 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.