#155B79
Closest named color: Deep Sea Blue (#015482). oklch(44.4% 0.082 232), rgb(21, 91, 121).
Aa
White text reads best on this color (7.48:1).
About this color
#155B79 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.082 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.031 away. White text reads best on it, at 7.48:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.80:1 |
| White text | 7.48:1 |
Values
| HEX | #155B79 |
| RGB | rgb(21, 91, 121) |
| HSL | hsl(198, 70%, 28%) |
| OKLCH | oklch(44.4% 0.082 232) |
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 #155B79 | 7.48:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #155B79 | 2.80:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #155B79 text on white | 7.48:1 | AAA | Lc 85.7 | Fine for body text |
| #155B79 text on black | 2.80:1 | Fails | Lc -16.4 | 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 800.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C9DDE8
oklch(88.6% 0.026 231.7)
-
Step 300
300
#A2C7DB
oklch(80.9% 0.049 231.7)
-
Step 400
400
#6EA9C8
oklch(70.6% 0.076 232.3)
-
Step 500
500
#4294BA
oklch(63.2% 0.097 231.2)
-
Step 600
600
#197DA7
oklch(55.6% 0.107 232.5)
-
Step 700
700
#046A8F
oklch(49.2% 0.099 231.6)
-
Step 800
800 (this color)
#155B79
oklch(44.4% 0.082 232)
-
Step 900
900
#16475E
oklch(37.7% 0.065 232.7)
-
Step 950
950
#0F2A37
oklch(27.1% 0.041 231.9)
#155B79 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) | #4C5A7A | 0.054 |
| Deuteranopia (no green cones) | #3F5179 | 0.045 |
| Tritanopia (no blue cones) | #006365 | 0.049 |
| Achromatopsia (no color) | #555555 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155B79
#155B79
oklch(44.4% 0.082 232)
- #774526
#774526
oklch(44.3% 0.082 51)
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 #155B79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.031
- Petrol #005F6A ΔE 0.033
- Light Navy Blue #2E5A88 ΔE 0.033
- YInMn Blue #415A77 ΔE 0.039
- Light Navy #155084 ΔE 0.042
- Dusk Blue #26538D ΔE 0.047
- Peacock Blue #016795 ΔE 0.051
- Denim #3B638C ΔE 0.052
Use #155B79 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.