#01809B
Closest named color: Ocean (#017B92). oklch(55.5% 0.1 219.5), rgb(1, 128, 155).
Aa
White text reads best on this color (4.60:1).
About this color
#01809B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 55%, its chroma 0.100 and its hue 220°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean (#017B92), ΔE 0.018 away. White text reads best on it, at 4.60:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Ocean (#017B92) |
| Black text | 4.56:1 |
| White text | 4.60:1 |
Values
| HEX | #01809B |
| RGB | rgb(1, 128, 155) |
| HSL | hsl(191, 99%, 31%) |
| OKLCH | oklch(55.5% 0.1 219.5) |
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 #01809B | 4.60:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #01809B | 4.56:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #01809B text on white | 4.60:1 | AA | Lc 71.4 | Content text, not long reading |
| #01809B text on black | 4.56:1 | AA | Lc -30.3 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C8DDE5
oklch(88.4% 0.025 222.6)
-
Step 300
300
#A1C8D5
oklch(80.9% 0.045 220.1)
-
Step 400
400
#6BACC0
oklch(70.8% 0.072 219.5)
-
Step 500
500
#3C96B0
oklch(63% 0.093 220.3)
-
Step 600
600 (this color)
#01809B
oklch(55.5% 0.1 219.5)
-
Step 700
700
#006C83
oklch(49.1% 0.089 219.3)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#124957
oklch(37.7% 0.06 218.7)
-
Step 950
950
#0D2B33
oklch(27.1% 0.038 218.3)
#01809B 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) | #6F7C9C | 0.083 |
| Deuteranopia (no green cones) | #5E709B | 0.074 |
| Tritanopia (no blue cones) | #008989 | 0.045 |
| Achromatopsia (no color) | #757575 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #01809B
#01809B
oklch(55.5% 0.1 219.5)
- #A45D45
#A45D45
oklch(55.5% 0.1 39.3)
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 #01809B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean #017B92 ΔE 0.018
- Teal Blue #01889F ΔE 0.024
- Sea Blue #047495 ΔE 0.036
- Cerulean #457B9D ΔE 0.036
- Nice Blue #107AB0 ΔE 0.042
- Blue NCS #118AB2 ΔE 0.042
- Teal #008080 ΔE 0.044
- Deep Aqua #08787F ΔE 0.045
Use #01809B 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.