#155D8F
Closest named color: Light Navy Blue (#2E5A88). oklch(46.2% 0.106 244.9), rgb(21, 93, 143).
Aa
White text reads best on this color (7.01:1).
About this color
#155D8F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.106 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.019 away. White text reads best on it, at 7.01:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.99:1 |
| White text | 7.01:1 |
Values
| HEX | #155D8F |
| RGB | rgb(21, 93, 143) |
| HSL | hsl(205, 74%, 32%) |
| OKLCH | oklch(46.2% 0.106 244.9) |
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 #155D8F | 7.01:1 | AAA | Lc -88.9 | Fine for body text |
| Black text on #155D8F | 2.99:1 | Fails | Lc 20.2 | Dividers and decoration only |
| #155D8F text on white | 7.01:1 | AAA | Lc 83.9 | Fine for body text |
| #155D8F text on black | 2.99:1 | Fails | Lc -18.1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEB
oklch(88.6% 0.028 243.1)
-
Step 300
300
#A6C5E0
oklch(81% 0.051 244.8)
-
Step 400
400
#75A6D0
oklch(70.6% 0.081 245.2)
-
Step 500
500
#4E90C4
oklch(63.2% 0.104 244.3)
-
Step 600
600
#2E79B1
oklch(55.6% 0.114 244.7)
-
Step 700
700 (this color)
#155D8F
oklch(46.2% 0.106 244.9)
-
Step 800
800
#1D537B
oklch(42.7% 0.087 244.5)
-
Step 900
900
#1E4563
oklch(37.7% 0.068 244.3)
-
Step 950
950
#13283A
oklch(26.9% 0.043 246.2)
#155D8F 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) | #455F91 | 0.044 |
| Deuteranopia (no green cones) | #34548E | 0.032 |
| Tritanopia (no blue cones) | #00696F | 0.073 |
| Achromatopsia (no color) | #595959 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155D8F
#155D8F
oklch(46.2% 0.106 244.9)
- #7F4A00
#7F4A00
oklch(46.1% 0.104 65)
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 #155D8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.019
- Peacock Blue #016795 ΔE 0.029
- Dusk Blue #26538D ΔE 0.029
- Denim Blue #3B5B92 ΔE 0.031
- Deep Sea Blue #015482 ΔE 0.034
- Denim #3B638C ΔE 0.038
- Light Navy #155084 ΔE 0.040
- Dusky Blue #475F94 ΔE 0.047
Use #155D8F 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.