#288BA7
Closest named color: Blue NCS (#118AB2). oklch(59.3% 0.097 221.3), rgb(40, 139, 167).
Aa
Black text reads best on this color (5.34:1).
About this color
#288BA7 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.097 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.019 away. Black text reads best on it, at 5.34:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.34:1 |
| White text | 3.93:1 |
Values
| HEX | #288BA7 |
| RGB | rgb(40, 139, 167) |
| HSL | hsl(193, 61%, 41%) |
| OKLCH | oklch(59.3% 0.097 221.3) |
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 #288BA7 | 3.93:1 | AA large text | Lc -71.9 | Content text, not long reading |
| Black text on #288BA7 | 5.34:1 | AA | Lc 37.7 | Non-text elements, placeholder text |
| #288BA7 text on white | 3.93:1 | AA large text | Lc 66.4 | Content text, not long reading |
| #288BA7 text on black | 5.34:1 | AA | Lc -35.3 | 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
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C9DDE5
oklch(88.5% 0.024 223.7)
-
Step 300
300
#A2C8D5
oklch(81% 0.044 220.7)
-
Step 400
400
#6EABC0
oklch(70.7% 0.07 221.8)
-
Step 500
500
#4296B0
oklch(63.2% 0.089 221.3)
-
Step 600
600 (this color)
#288BA7
oklch(59.3% 0.097 221.3)
-
Step 700
700
#006C85
oklch(49.2% 0.09 221.2)
-
Step 800
800
#0B586C
oklch(42.8% 0.075 221.3)
-
Step 900
900
#164857
oklch(37.6% 0.058 221.6)
-
Step 950
950
#0F2B33
oklch(27.1% 0.037 219.3)
#288BA7 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) | #7A87A8 | 0.079 |
| Deuteranopia (no green cones) | #697BA7 | 0.070 |
| Tritanopia (no blue cones) | #009494 | 0.047 |
| Achromatopsia (no color) | #808080 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288BA7
#288BA7
oklch(59.3% 0.097 221.3)
- #AF6A50
#AF6A50
oklch(59.4% 0.097 41.3)
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 #288BA7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.019
- Teal Blue #01889F ΔE 0.020
- Teal Green #0A9396 ΔE 0.042
- Steel Blue #4682B4 ΔE 0.042
- Off Blue #5684AE ΔE 0.043
- Dusty Blue #5A86AD ΔE 0.044
- Cool Blue #4984B8 ΔE 0.044
- Cerulean #457B9D ΔE 0.046
Use #288BA7 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.