#288BAC
Closest named color: Blue NCS (#118AB2). oklch(59.6% 0.101 225.1), rgb(40, 139, 172).
Aa
Black text reads best on this color (5.37:1).
About this color
#288BAC is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 60%, its chroma 0.101 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.013 away. Black text reads best on it, at 5.37:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.37:1 |
| White text | 3.90:1 |
Values
| HEX | #288BAC |
| RGB | rgb(40, 139, 172) |
| HSL | hsl(195, 62%, 42%) |
| OKLCH | oklch(59.6% 0.101 225.1) |
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 #288BAC | 3.90:1 | AA large text | Lc -71.6 | Content text, not long reading |
| Black text on #288BAC | 5.37:1 | AA | Lc 38.0 | Non-text elements, placeholder text |
| #288BAC text on white | 3.90:1 | AA large text | Lc 66.1 | Content text, not long reading |
| #288BAC text on black | 5.37:1 | AA | Lc -35.6 | 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 500.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF1
oklch(93.6% 0.015 224.5)
-
Step 200
200
#C7DDE7
oklch(88.4% 0.027 226.8)
-
Step 300
300
#9FC8D9
oklch(80.9% 0.05 225.1)
-
Step 400
400
#68ABC6
oklch(70.7% 0.079 225.8)
-
Step 500
500 (this color)
#288BAC
oklch(59.6% 0.101 225.1)
-
Step 600
600
#007FA2
oklch(55.5% 0.106 225.7)
-
Step 700
700
#006B88
oklch(49.1% 0.093 224.9)
-
Step 800
800
#005870
oklch(42.8% 0.081 224.4)
-
Step 900
900
#0D485C
oklch(37.6% 0.066 226.3)
-
Step 950
950
#0B2B36
oklch(27.1% 0.042 224.5)
#288BAC 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) | #7988AE | 0.077 |
| Deuteranopia (no green cones) | #677BAC | 0.068 |
| Tritanopia (no blue cones) | #009596 | 0.053 |
| Achromatopsia (no color) | #818181 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288BAC
#288BAC
oklch(59.6% 0.101 225.1)
- #B06B4A
#B06B4A
oklch(59.6% 0.1 45.8)
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 #288BAC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.013
- Teal Blue #01889F ΔE 0.026
- Steel Blue #4682B4 ΔE 0.037
- Cool Blue #4984B8 ΔE 0.038
- Off Blue #5684AE ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.041
- Cerulean #457B9D ΔE 0.047
- Teal Green #0A9396 ΔE 0.049
Use #288BAC 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.