#155A77
Closest named color: Deep Sea Blue (#015482). oklch(44% 0.08 231.4), rgb(21, 90, 119).
Aa
White text reads best on this color (7.60:1).
About this color
#155A77 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.080 and its hue 231°. 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 7.60:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.76:1 |
| White text | 7.60:1 |
Values
| HEX | #155A77 |
| RGB | rgb(21, 90, 119) |
| HSL | hsl(198, 70%, 27%) |
| OKLCH | oklch(44% 0.08 231.4) |
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 #155A77 | 7.60:1 | AAA | Lc -90.9 | Preferred for body text |
| Black text on #155A77 | 2.76:1 | Fails | Lc 17.9 | Dividers and decoration only |
| #155A77 text on white | 7.60:1 | AAA | Lc 86.1 | Fine for body text |
| #155A77 text on black | 2.76:1 | Fails | Lc -16.0 | 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
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C9DDE8
oklch(88.6% 0.026 231.7)
-
Step 300
300
#A3C7DA
oklch(81% 0.047 231.1)
-
Step 400
400
#6FA9C7
oklch(70.6% 0.075 231.8)
-
Step 500
500
#4394B9
oklch(63.2% 0.096 230.7)
-
Step 600
600
#1B7DA5
oklch(55.5% 0.104 231.5)
-
Step 700
700
#086A8E
oklch(49.2% 0.097 231.2)
-
Step 800
800 (this color)
#155A77
oklch(44% 0.08 231.4)
-
Step 900
900
#17475D
oklch(37.6% 0.063 231.9)
-
Step 950
950
#0F2A36
oklch(27% 0.04 229.8)
#155A77 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) | #4B5978 | 0.053 |
| Deuteranopia (no green cones) | #3E5077 | 0.045 |
| Tritanopia (no blue cones) | #006264 | 0.047 |
| Achromatopsia (no color) | #545454 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155A77
#155A77
oklch(44% 0.08 231.4)
- #754526
#754526
oklch(44.1% 0.08 52.1)
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 #155A77, 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 0.032
- Light Navy Blue #2E5A88 ΔE 0.036
- YInMn Blue #415A77 ΔE 0.040
- Light Navy #155084 ΔE 0.042
- Dusk Blue #26538D ΔE 0.048
- Deep Teal #00555A ΔE 0.051
- Denim #3B638C ΔE 0.055
Use #155A77 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.