#287F9B
Closest named color: Ocean (#017B92). oklch(55.8% 0.091 223.8), rgb(40, 127, 155).
Aa
Black text reads best on this color (4.59:1).
About this color
#287F9B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 56%, its chroma 0.091 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean (#017B92), ΔE 0.024 away. Black text reads best on it, at 4.59:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Ocean (#017B92) |
| Black text | 4.59:1 |
| White text | 4.56:1 |
Values
| HEX | #287F9B |
| RGB | rgb(40, 127, 155) |
| HSL | hsl(195, 59%, 38%) |
| OKLCH | oklch(55.8% 0.091 223.8) |
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 #287F9B | 4.56:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #287F9B | 4.59:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #287F9B text on white | 4.56:1 | AA | Lc 71.4 | Content text, not long reading |
| #287F9B text on black | 4.59:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADDE4
oklch(88.5% 0.023 221.8)
-
Step 300
300
#A5C7D4
oklch(80.9% 0.041 223)
-
Step 400
400
#73AABF
oklch(70.7% 0.065 223.9)
-
Step 500
500
#4A94AF
oklch(63% 0.084 224.5)
-
Step 600
600 (this color)
#287F9B
oklch(55.8% 0.091 223.8)
-
Step 700
700
#186B84
oklch(49.2% 0.084 223.4)
-
Step 800
800
#18576B
oklch(42.7% 0.07 223.5)
-
Step 900
900
#1C4857
oklch(37.8% 0.054 223.5)
-
Step 950
950
#122A33
oklch(27% 0.034 224.8)
#287F9B 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 | 0.071 |
| Deuteranopia (no green cones) | #60719B | 0.063 |
| Tritanopia (no blue cones) | #008888 | 0.048 |
| Achromatopsia (no color) | #767676 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #287F9B
#287F9B
oklch(55.8% 0.091 223.8)
- #A06247
#A06247
oklch(55.9% 0.09 44)
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 #287F9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean #017B92 ΔE 0.024
- Cerulean #457B9D ΔE 0.024
- Teal Blue #01889F ΔE 0.026
- Stormy Blue #507B9C ΔE 0.034
- Dull Blue #49759C ΔE 0.037
- Sea Blue #047495 ΔE 0.038
- Nice Blue #107AB0 ΔE 0.041
- Blue NCS #118AB2 ΔE 0.041
Use #287F9B 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.