#155F99
Closest named color: Peacock Blue (#016795). oklch(47.3% 0.116 247.9), rgb(21, 95, 153).
Aa
White text reads best on this color (6.71:1).
About this color
#155F99 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.116 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Peacock Blue (#016795), ΔE 0.026 away. White text reads best on it, at 6.71:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Peacock Blue (#016795) |
| Black text | 3.12:1 |
| White text | 6.71:1 |
Values
| HEX | #155F99 |
| RGB | rgb(21, 95, 153) |
| HSL | hsl(206, 76%, 34%) |
| OKLCH | oklch(47.3% 0.116 247.9) |
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 #155F99 | 6.71:1 | AA | Lc -87.7 | Fine for body text |
| Black text on #155F99 | 3.12:1 | AA large text | Lc 21.4 | Dividers and decoration only |
| #155F99 text on white | 6.71:1 | AA | Lc 82.7 | Fine for body text |
| #155F99 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADCED
oklch(88.6% 0.03 246.6)
-
Step 300
300
#A5C5E4
oklch(81% 0.056 247.7)
-
Step 400
400
#72A6D6
oklch(70.7% 0.09 247.2)
-
Step 500
500
#4B8FCB
oklch(63.2% 0.114 247.4)
-
Step 600
600
#2B78B8
oklch(55.7% 0.124 247.6)
-
Step 700
700 (this color)
#155F99
oklch(47.3% 0.116 247.9)
-
Step 800
800
#1A5281
oklch(42.7% 0.097 248)
-
Step 900
900
#1D4467
oklch(37.6% 0.075 248.2)
-
Step 950
950
#12283C
oklch(26.9% 0.047 247.8)
#155F99 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) | #43629B | 0.041 |
| Deuteranopia (no green cones) | #2F5698 | 0.028 |
| Tritanopia (no blue cones) | #006D74 | 0.084 |
| Achromatopsia (no color) | #5C5C5C | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155F99
#155F99
oklch(47.3% 0.116 247.9)
- #814E00
#814E00
oklch(47.2% 0.104 67.6)
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 #155F99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Peacock Blue #016795 ΔE 0.026
- Denim Blue #3B5B92 ΔE 0.030
- Light Navy Blue #2E5A88 ΔE 0.031
- Dusk Blue #26538D ΔE 0.036
- Denim #3B638C ΔE 0.039
- Dusky Blue #475F94 ΔE 0.043
- Deep Sea Blue #015482 ΔE 0.048
- Mid Blue #276AB3 ΔE 0.052
Use #155F99 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.