#288AAB
Closest named color: Blue NCS (#118AB2). oklch(59.3% 0.1 225.3), rgb(40, 138, 171).
Aa
Black text reads best on this color (5.31:1).
About this color
#288AAB is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.100 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 5.31:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.31:1 |
| White text | 3.95:1 |
Values
| HEX | #288AAB |
| RGB | rgb(40, 138, 171) |
| HSL | hsl(195, 62%, 41%) |
| OKLCH | oklch(59.3% 0.1 225.3) |
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 #288AAB | 3.95:1 | AA large text | Lc -72.0 | Content text, not long reading |
| Black text on #288AAB | 5.31:1 | AA | Lc 37.5 | Non-text elements, placeholder text |
| #288AAB text on white | 3.95:1 | AA large text | Lc 66.5 | Content text, not long reading |
| #288AAB text on black | 5.31:1 | AA | Lc -35.1 | 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
#C9DDE6
oklch(88.5% 0.025 226.5)
-
Step 300
300
#A2C7D7
oklch(80.8% 0.045 226)
-
Step 400
400
#6EAAC3
oklch(70.6% 0.072 226.3)
-
Step 500
500
#4295B4
oklch(63.1% 0.092 225.7)
-
Step 600
600 (this color)
#288AAB
oklch(59.3% 0.1 225.3)
-
Step 700
700
#016B88
oklch(49.1% 0.093 224.9)
-
Step 800
800
#0C576F
oklch(42.7% 0.077 226)
-
Step 900
900
#16485A
oklch(37.7% 0.06 225.9)
-
Step 950
950
#0F2A34
oklch(26.9% 0.038 225.1)
#288AAB 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) | #7887AD | 0.076 |
| Deuteranopia (no green cones) | #667AAB | 0.067 |
| Tritanopia (no blue cones) | #009495 | 0.053 |
| Achromatopsia (no color) | #808080 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288AAB
#288AAB
oklch(59.3% 0.1 225.3)
- #AF6A4A
#AF6A4A
oklch(59.3% 0.1 45.2)
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 #288AAB, 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 0.024
- Steel Blue #4682B4 ΔE 0.036
- Cool Blue #4984B8 ΔE 0.038
- Off Blue #5684AE ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.041
- Cerulean #457B9D ΔE 0.044
- Stormy Blue #507B9C ΔE 0.048
Use #288AAB 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.