#155CAC
Closest named color: Mid Blue (#276AB3). oklch(47.9% 0.144 255.2), rgb(21, 92, 172).
Aa
White text reads best on this color (6.64:1).
About this color
#155CAC is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.144 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.043 away. White text reads best on it, at 6.64:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.15:1 |
| White text | 6.64:1 |
Values
| HEX | #155CAC |
| RGB | rgb(21, 92, 172) |
| HSL | hsl(212, 78%, 38%) |
| OKLCH | oklch(47.9% 0.144 255.2) |
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 #155CAC | 6.64:1 | AA | Lc -87.4 | Fine for body text |
| Black text on #155CAC | 3.15:1 | AA large text | Lc 21.7 | Dividers and decoration only |
| #155CAC text on white | 6.64:1 | AA | Lc 82.3 | Fine for body text |
| #155CAC text on black | 3.15:1 | AA large text | Lc -19.6 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF3
oklch(88.5% 0.038 255.6)
-
Step 300
300
#A3C3EE
oklch(80.9% 0.07 255.9)
-
Step 400
400
#70A3E5
oklch(70.7% 0.112 255.3)
-
Step 500
500
#488BDE
oklch(63.2% 0.143 255)
-
Step 600
600
#2873CB
oklch(55.6% 0.154 255)
-
Step 700
700 (this color)
#155CAC
oklch(47.9% 0.144 255.2)
-
Step 800
800
#184F8E
oklch(42.8% 0.119 254.7)
-
Step 900
900
#1B4272
oklch(37.8% 0.093 255.2)
-
Step 950
950
#112743
oklch(27.1% 0.059 255.4)
#155CAC 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) | #3063AF | 0.029 |
| Deuteranopia (no green cones) | #0356AA | 0.019 |
| Tritanopia (no blue cones) | #006F7B | 0.108 |
| Achromatopsia (no color) | #5C5C5C | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155CAC
#155CAC
oklch(47.9% 0.144 255.2)
- #7E5400
#7E5400
oklch(48% 0.101 75.5)
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 #155CAC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.049
- Dusk Blue #26538D ΔE 0.052
- Peacock Blue #016795 ΔE 0.053
- Light Navy Blue #2E5A88 ΔE 0.059
- Dusky Blue #475F94 ΔE 0.059
- French Blue #436BAD ΔE 0.061
- Denim #3B638C ΔE 0.066
Use #155CAC 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.