#287FA1
Closest named color: Cerulean (#457B9D). oklch(56.1% 0.095 228.6), rgb(40, 127, 161).
Aa
Black text reads best on this color (4.64:1).
About this color
#287FA1 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 56%, its chroma 0.095 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.022 away. Black text reads best on it, at 4.64:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.64:1 |
| White text | 4.52:1 |
Values
| HEX | #287FA1 |
| RGB | rgb(40, 127, 161) |
| HSL | hsl(197, 60%, 39%) |
| OKLCH | oklch(56.1% 0.095 228.6) |
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 #287FA1 | 4.52:1 | AA | Lc -76.6 | Fine for body text |
| Black text on #287FA1 | 4.64:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #287FA1 text on white | 4.52:1 | AA | Lc 71.1 | Content text, not long reading |
| #287FA1 text on black | 4.64:1 | AA | Lc -30.6 | 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
#CADDE6
oklch(88.6% 0.024 227.8)
-
Step 300
300
#A5C7D7
oklch(81% 0.043 228)
-
Step 400
400
#72A9C3
oklch(70.6% 0.069 229.2)
-
Step 500
500
#4994B4
oklch(63.2% 0.088 228.4)
-
Step 600
600 (this color)
#287FA1
oklch(56.1% 0.095 228.6)
-
Step 700
700
#176A88
oklch(49.1% 0.088 228)
-
Step 800
800
#17566F
oklch(42.6% 0.074 229.2)
-
Step 900
900
#1B475A
oklch(37.6% 0.058 229.5)
-
Step 950
950
#112A35
oklch(27.1% 0.037 229)
#287FA1 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) | #6D7DA3 | 0.068 |
| Deuteranopia (no green cones) | #5D71A1 | 0.059 |
| Tritanopia (no blue cones) | #00898A | 0.056 |
| Achromatopsia (no color) | #767676 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #287FA1
#287FA1
oklch(56.1% 0.095 228.6)
- #A26340
#A26340
oklch(56.2% 0.096 49)
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 #287FA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.022
- Teal Blue #01889F ΔE 0.029
- Ocean #017B92 ΔE 0.030
- Stormy Blue #507B9C ΔE 0.033
- Nice Blue #107AB0 ΔE 0.033
- Dull Blue #49759C ΔE 0.035
- Blue NCS #118AB2 ΔE 0.036
- Steel Blue #4682B4 ΔE 0.040
Use #287FA1 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.