#155CA1
Closest named color: Denim Blue (#3B5B92). oklch(47.1% 0.13 252.4), rgb(21, 92, 161).
Aa
White text reads best on this color (6.82:1).
About this color
#155CA1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.130 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.036 away. White text reads best on it, at 6.82:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.07:1 |
| White text | 6.82:1 |
Values
| HEX | #155CA1 |
| RGB | rgb(21, 92, 161) |
| HSL | hsl(210, 77%, 36%) |
| OKLCH | oklch(47.1% 0.13 252.4) |
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 #155CA1 | 6.82:1 | AA | Lc -88.1 | Fine for body text |
| Black text on #155CA1 | 3.07:1 | AA large text | Lc 21.0 | Dividers and decoration only |
| #155CA1 text on white | 6.82:1 | AA | Lc 83.1 | Fine for body text |
| #155CA1 text on black | 3.07:1 | AA large text | Lc -18.9 | 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 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
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A4C4E9
oklch(80.9% 0.063 252.3)
-
Step 400
400
#72A4DE
oklch(70.7% 0.101 252.8)
-
Step 500
500
#4B8CD5
oklch(63% 0.129 252.9)
-
Step 600
600
#2B75C2
oklch(55.6% 0.14 252.5)
-
Step 700
700 (this color)
#155CA1
oklch(47.1% 0.13 252.4)
-
Step 800
800
#1B5088
oklch(42.7% 0.108 252.9)
-
Step 900
900
#1C436D
oklch(37.7% 0.085 252.5)
-
Step 950
950
#122740
oklch(26.9% 0.054 254)
#155CA1 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) | #3961A4 | 0.033 |
| Deuteranopia (no green cones) | #1F55A0 | 0.019 |
| Tritanopia (no blue cones) | #006D76 | 0.098 |
| Achromatopsia (no color) | #5B5B5B | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155CA1
#155CA1
oklch(47.1% 0.13 252.4)
- #7D5000
#7D5000
oklch(47.1% 0.101 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 #155CA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.036
- Dusk Blue #26538D ΔE 0.038
- Peacock Blue #016795 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.042
- Mid Blue #276AB3 ΔE 0.049
- Dusky Blue #475F94 ΔE 0.050
- Denim #3B638C ΔE 0.053
- Light Navy #155084 ΔE 0.055
Use #155CA1 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.