#288BAF
Closest named color: Blue NCS (#118AB2). oklch(59.7% 0.103 227.3), rgb(40, 139, 175).
Aa
Black text reads best on this color (5.40:1).
About this color
#288BAF is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 60%, its chroma 0.103 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.010 away. Black text reads best on it, at 5.40:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.40:1 |
| White text | 3.88:1 |
Values
| HEX | #288BAF |
| RGB | rgb(40, 139, 175) |
| HSL | hsl(196, 63%, 42%) |
| OKLCH | oklch(59.7% 0.103 227.3) |
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 #288BAF | 3.88:1 | AA large text | Lc -71.5 | Content text, not long reading |
| Black text on #288BAF | 5.40:1 | AA | Lc 38.1 | Non-text elements, placeholder text |
| #288BAF text on white | 3.88:1 | AA large text | Lc 66.0 | Content text, not long reading |
| #288BAF text on black | 5.40:1 | AA | Lc -35.7 | 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 500.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF2
oklch(93.6% 0.015 229)
-
Step 200
200
#C7DDE8
oklch(88.5% 0.028 229.2)
-
Step 300
300
#9FC8DA
oklch(80.9% 0.05 226.5)
-
Step 400
400
#67ABC8
oklch(70.7% 0.081 227.3)
-
Step 500
500 (this color)
#288BAF
oklch(59.7% 0.103 227.3)
-
Step 600
600
#007FA4
oklch(55.6% 0.108 227.1)
-
Step 700
700
#006B8A
oklch(49.2% 0.095 226.5)
-
Step 800
800
#005772
oklch(42.6% 0.083 227.6)
-
Step 900
900
#0D485D
oklch(37.6% 0.067 227.5)
-
Step 950
950
#0B2A37
oklch(26.9% 0.043 229.3)
#288BAF 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) | #7888B1 | 0.076 |
| Deuteranopia (no green cones) | #667CAF | 0.065 |
| Tritanopia (no blue cones) | #009597 | 0.056 |
| Achromatopsia (no color) | #818181 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288BAF
#288BAF
oklch(59.7% 0.103 227.3)
- #B16B47
#B16B47
oklch(59.7% 0.103 47.3)
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 #288BAF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.010
- Teal Blue #01889F ΔE 0.030
- Steel Blue #4682B4 ΔE 0.034
- Cool Blue #4984B8 ΔE 0.035
- Off Blue #5684AE ΔE 0.038
- Dusty Blue #5A86AD ΔE 0.040
- Cerulean #457B9D ΔE 0.048
- Water Blue #0E87CC ΔE 0.050
Use #288BAF 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.