#155CA7
Closest named color: Denim Blue (#3B5B92). oklch(47.5% 0.138 254.1), rgb(21, 92, 167).
Aa
White text reads best on this color (6.72:1).
About this color
#155CA7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.138 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.043 away. White text reads best on it, at 6.72:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.12:1 |
| White text | 6.72:1 |
Values
| HEX | #155CA7 |
| RGB | rgb(21, 92, 167) |
| HSL | hsl(211, 78%, 37%) |
| OKLCH | oklch(47.5% 0.138 254.1) |
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 #155CA7 | 6.72:1 | AA | Lc -87.7 | Fine for body text |
| Black text on #155CA7 | 3.12:1 | AA large text | Lc 21.4 | Dividers and decoration only |
| #155CA7 text on white | 6.72:1 | AA | Lc 82.7 | Fine for body text |
| #155CA7 text on black | 3.12:1 | AA large text | Lc -19.3 | 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
#A3C4EC
oklch(81% 0.067 253.5)
-
Step 400
400
#71A4E2
oklch(70.8% 0.106 253.9)
-
Step 500
500
#498BDA
oklch(63% 0.137 254.3)
-
Step 600
600
#2974C7
oklch(55.6% 0.148 253.9)
-
Step 700
700 (this color)
#155CA7
oklch(47.5% 0.138 254.1)
-
Step 800
800
#194F8B
oklch(42.6% 0.114 254)
-
Step 900
900
#1C426F
oklch(37.6% 0.089 254.4)
-
Step 950
950
#112741
oklch(26.9% 0.056 253.9)
#155CA7 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) | #3462AA | 0.031 |
| Deuteranopia (no green cones) | #1456A6 | 0.017 |
| Tritanopia (no blue cones) | #006E79 | 0.103 |
| Achromatopsia (no color) | #5C5C5C | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155CA7
#155CA7
oklch(47.5% 0.138 254.1)
- #7D5200
#7D5200
oklch(47.5% 0.1 74.2)
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 #155CA7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.043
- Mid Blue #276AB3 ΔE 0.045
- Dusk Blue #26538D ΔE 0.045
- Peacock Blue #016795 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.051
- Dusky Blue #475F94 ΔE 0.054
- Denim #3B638C ΔE 0.059
- French Blue #436BAD ΔE 0.061
Use #155CA7 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.