#155CA5
Closest named color: Denim Blue (#3B5B92). oklch(47.4% 0.135 253.5), rgb(21, 92, 165).
Aa
White text reads best on this color (6.76:1).
About this color
#155CA5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.135 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.041 away. White text reads best on it, at 6.76:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.10:1 |
| White text | 6.76:1 |
Values
| HEX | #155CA5 |
| RGB | rgb(21, 92, 165) |
| HSL | hsl(210, 77%, 36%) |
| OKLCH | oklch(47.4% 0.135 253.5) |
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 #155CA5 | 6.76:1 | AA | Lc -87.8 | Fine for body text |
| Black text on #155CA5 | 3.10:1 | AA large text | Lc 21.2 | Dividers and decoration only |
| #155CA5 text on white | 6.76:1 | AA | Lc 82.8 | Fine for body text |
| #155CA5 text on black | 3.10:1 | AA large text | Lc -19.1 | 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
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A4C4EB
oklch(81% 0.065 253.6)
-
Step 400
400
#71A4E1
oklch(70.7% 0.105 253.6)
-
Step 500
500
#4A8CD8
oklch(63.2% 0.134 253.5)
-
Step 600
600
#2A74C5
oklch(55.5% 0.145 253.6)
-
Step 700
700 (this color)
#155CA5
oklch(47.4% 0.135 253.5)
-
Step 800
800
#1A508A
oklch(42.8% 0.111 253.3)
-
Step 900
900
#1C436E
oklch(37.8% 0.086 253)
-
Step 950
950
#112741
oklch(26.9% 0.056 253.9)
#155CA5 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) | #3662A8 | 0.032 |
| Deuteranopia (no green cones) | #1855A4 | 0.019 |
| Tritanopia (no blue cones) | #006E78 | 0.102 |
| Achromatopsia (no color) | #5B5B5B | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155CA5
#155CA5
oklch(47.4% 0.135 253.5)
- #7D5100
#7D5100
oklch(47.3% 0.101 73.2)
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 #155CA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.041
- Dusk Blue #26538D ΔE 0.043
- Peacock Blue #016795 ΔE 0.045
- Mid Blue #276AB3 ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.048
- Dusky Blue #475F94 ΔE 0.053
- Denim #3B638C ΔE 0.057
- Light Navy #155084 ΔE 0.060
Use #155CA5 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.