#155EA5
Closest named color: Denim Blue (#3B5B92). oklch(47.8% 0.133 252.5), rgb(21, 94, 165).
Aa
White text reads best on this color (6.61:1).
About this color
#155EA5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.133 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.039 away. White text reads best on it, at 6.61:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.17:1 |
| White text | 6.61:1 |
Values
| HEX | #155EA5 |
| RGB | rgb(21, 94, 165) |
| HSL | hsl(210, 77%, 36%) |
| OKLCH | oklch(47.8% 0.133 252.5) |
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 #155EA5 | 6.61:1 | AA | Lc -87.3 | Fine for body text |
| Black text on #155EA5 | 3.17:1 | AA large text | Lc 21.8 | Dividers and decoration only |
| #155EA5 text on white | 6.61:1 | AA | Lc 82.2 | Fine for body text |
| #155EA5 text on black | 3.17:1 | AA large text | Lc -19.7 | 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
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A3C4EA
oklch(80.9% 0.065 252.2)
-
Step 400
400
#71A4DF
oklch(70.6% 0.103 252.8)
-
Step 500
500
#498CD6
oklch(63% 0.131 252.6)
-
Step 600
600
#2875C4
oklch(55.6% 0.143 252.5)
-
Step 700
700 (this color)
#155EA5
oklch(47.8% 0.133 252.5)
-
Step 800
800
#195089
oklch(42.7% 0.11 252.7)
-
Step 900
900
#1B436D
oklch(37.7% 0.085 252)
-
Step 950
950
#112740
oklch(26.9% 0.055 253.1)
#155EA5 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) | #3A64A8 | 0.035 |
| Deuteranopia (no green cones) | #1E57A4 | 0.019 |
| Tritanopia (no blue cones) | #006F79 | 0.098 |
| Achromatopsia (no color) | #5D5D5D | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155EA5
#155EA5
oklch(47.8% 0.133 252.5)
- #805200
#805200
oklch(47.9% 0.102 72.2)
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 #155EA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.039
- Peacock Blue #016795 ΔE 0.041
- Mid Blue #276AB3 ΔE 0.042
- Dusk Blue #26538D ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.047
- Dusky Blue #475F94 ΔE 0.050
- Denim #3B638C ΔE 0.054
- French Blue #436BAD ΔE 0.057
Use #155EA5 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.