#155EA0
Closest named color: Denim Blue (#3B5B92). oklch(47.5% 0.126 251), rgb(21, 94, 160).
Aa
White text reads best on this color (6.68:1).
About this color
#155EA0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.126 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.035 away. White text reads best on it, at 6.68:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.14:1 |
| White text | 6.68:1 |
Values
| HEX | #155EA0 |
| RGB | rgb(21, 94, 160) |
| HSL | hsl(208, 77%, 35%) |
| OKLCH | oklch(47.5% 0.126 251) |
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 #155EA0 | 6.68:1 | AA | Lc -87.6 | Fine for body text |
| Black text on #155EA0 | 3.14:1 | AA large text | Lc 21.5 | Dividers and decoration only |
| #155EA0 text on white | 6.68:1 | AA | Lc 82.5 | Fine for body text |
| #155EA0 text on black | 3.14:1 | AA large text | Lc -19.4 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBEF
oklch(88.4% 0.034 251)
-
Step 300
300
#A4C4E7
oklch(80.9% 0.061 250.9)
-
Step 400
400
#72A5DC
oklch(70.8% 0.098 251.1)
-
Step 500
500
#4A8DD2
oklch(63.1% 0.125 251)
-
Step 600
600
#2A76BF
oklch(55.6% 0.135 251)
-
Step 700
700 (this color)
#155EA0
oklch(47.5% 0.126 251)
-
Step 800
800
#1A5186
oklch(42.8% 0.105 251.1)
-
Step 900
900
#1C436B
oklch(37.6% 0.082 251.4)
-
Step 950
950
#11283F
oklch(27.1% 0.052 250.3)
#155EA0 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) | #3D63A3 | 0.037 |
| Deuteranopia (no green cones) | #26569F | 0.023 |
| Tritanopia (no blue cones) | #006E77 | 0.093 |
| Achromatopsia (no color) | #5C5C5C | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155EA0
#155EA0
oklch(47.5% 0.126 251)
- #805100
#805100
oklch(47.7% 0.103 71.2)
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 #155EA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.035
- Peacock Blue #016795 ΔE 0.035
- Dusk Blue #26538D ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.040
- Mid Blue #276AB3 ΔE 0.046
- Dusky Blue #475F94 ΔE 0.047
- Denim #3B638C ΔE 0.048
- Deep Sea Blue #015482 ΔE 0.056
Use #155EA0 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.