#015B8B
Closest named color: Deep Sea Blue (#015482). oklch(45.1% 0.106 241.9), rgb(1, 91, 139).
Aa
White text reads best on this color (7.31:1).
About this color
#015B8B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.106 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.024 away. White text reads best on it, at 7.31:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.87:1 |
| White text | 7.31:1 |
Values
| HEX | #015B8B |
| RGB | rgb(1, 91, 139) |
| HSL | hsl(201, 99%, 27%) |
| OKLCH | oklch(45.1% 0.106 241.9) |
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 #015B8B | 7.31:1 | AAA | Lc -89.7 | Fine for body text |
| Black text on #015B8B | 2.87:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #015B8B text on white | 7.31:1 | AAA | Lc 84.8 | Fine for body text |
| #015B8B text on black | 2.87:1 | Fails | Lc -17.2 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C6DDEE
oklch(88.6% 0.034 239.9)
-
Step 300
300
#9EC6E6
oklch(80.9% 0.062 242.7)
-
Step 400
400
#65A8D9
oklch(70.6% 0.099 241.8)
-
Step 500
500
#3391CF
oklch(63% 0.127 242.1)
-
Step 600
600
#007AB9
oklch(55.5% 0.132 242.1)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800 (this color)
#015B8B
oklch(45.1% 0.106 241.9)
-
Step 900
900
#0B4669
oklch(37.7% 0.082 241.4)
-
Step 950
950
#0A293E
oklch(27% 0.053 242.3)
#015B8B 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) | #445C8D | 0.050 |
| Deuteranopia (no green cones) | #31518A | 0.037 |
| Tritanopia (no blue cones) | #00676C | 0.072 |
| Achromatopsia (no color) | #565656 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #015B8B
#015B8B
oklch(45.1% 0.106 241.9)
- #7E4600
#7E4600
oklch(45.2% 0.104 61.8)
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 #015B8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.024
- Light Navy Blue #2E5A88 ΔE 0.024
- Dusk Blue #26538D ΔE 0.028
- Light Navy #155084 ΔE 0.032
- Peacock Blue #016795 ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.041
- Denim #3B638C ΔE 0.048
- YInMn Blue #415A77 ΔE 0.053
Use #015B8B 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.