#1B516E
Closest named color: Deep Sea Blue (#015482). oklch(41.4% 0.074 236.2), rgb(27, 81, 110).
Aa
White text reads best on this color (8.57:1).
About this color
#1B516E is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.074 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.033 away. White text reads best on it, at 8.57:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.44:1 |
| White text | 8.57:1 |
Values
| HEX | #1B516E |
| RGB | rgb(27, 81, 110) |
| HSL | hsl(201, 61%, 27%) |
| OKLCH | oklch(41.4% 0.074 236.2) |
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 #1B516E | 8.57:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #1B516E | 2.44:1 | Fails | Lc 14.8 | Not readable |
| #1B516E text on white | 8.57:1 | AAA | Lc 89.2 | Fine for body text |
| #1B516E text on black | 2.44:1 | Fails | Lc -13.0 | Not readable |
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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A7C6D9
oklch(81% 0.043 235)
-
Step 400
400
#76A8C6
oklch(70.7% 0.069 235.4)
-
Step 500
500
#5192B8
oklch(63.2% 0.088 236.1)
-
Step 600
600
#317BA4
oklch(55.5% 0.096 236.6)
-
Step 700
700
#23688C
oklch(49.1% 0.089 235.7)
-
Step 800
800 (this color)
#1B516E
oklch(41.4% 0.074 236.2)
-
Step 900
900
#20465C
oklch(37.7% 0.057 236.4)
-
Step 950
950
#142936
oklch(27% 0.036 237.4)
#1B516E 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) | #43516F | 0.043 |
| Deuteranopia (no green cones) | #38496E | 0.036 |
| Tritanopia (no blue cones) | #00595B | 0.049 |
| Achromatopsia (no color) | #4C4C4C | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B516E
#1B516E
oklch(41.4% 0.074 236.2)
- #6A4020
#6A4020
oklch(41.4% 0.074 56.1)
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 #1B516E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.033
- Light Navy #155084 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.041
- Deep Teal #00555A ΔE 0.043
- Petrol #005F6A ΔE 0.047
- Charcoal #264653 ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.052
- Dark Slate Gray #2F4F4F ΔE 0.052
Use #1B516E 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.