#288EC1
Closest named color: Blue NCS (#118AB2). oklch(61.3% 0.118 235.9), rgb(40, 142, 193).
Aa
Black text reads best on this color (5.72:1).
About this color
#288EC1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.118 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.027 away. Black text reads best on it, at 5.72:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.72:1 |
| White text | 3.66:1 |
Values
| HEX | #288EC1 |
| RGB | rgb(40, 142, 193) |
| HSL | hsl(200, 66%, 46%) |
| OKLCH | oklch(61.3% 0.118 235.9) |
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 #288EC1 | 3.66:1 | AA large text | Lc -69.3 | Content text, not long reading |
| Black text on #288EC1 | 5.72:1 | AA | Lc 40.2 | Non-text elements, placeholder text |
| #288EC1 text on white | 3.66:1 | AA large text | Lc 63.8 | Content text, not long reading |
| #288EC1 text on black | 5.72:1 | AA | Lc -37.8 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF4
oklch(93.6% 0.017 236.7)
-
Step 200
200
#C6DDEC
oklch(88.5% 0.032 236.4)
-
Step 300
300
#9DC7E1
oklch(80.8% 0.058 235.6)
-
Step 400
400
#64AAD2
oklch(70.7% 0.092 235.2)
-
Step 500
500 (this color)
#288EC1
oklch(61.3% 0.118 235.9)
-
Step 600
600
#007DAF
oklch(55.7% 0.119 235.4)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#00567A
oklch(42.8% 0.091 235.4)
-
Step 900
900
#084765
oklch(37.7% 0.077 236.4)
-
Step 950
950
#092A3B
oklch(27.1% 0.049 235.4)
#288EC1 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) | #758DC3 | 0.069 |
| Deuteranopia (no green cones) | #617FC0 | 0.058 |
| Tritanopia (no blue cones) | #009BA0 | 0.073 |
| Achromatopsia (no color) | #868686 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288EC1
#288EC1
oklch(61.3% 0.118 235.9)
- #B96F36
#B96F36
oklch(61.2% 0.118 55.7)
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 #288EC1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.027
- Water Blue #0E87CC ΔE 0.031
- Cool Blue #4984B8 ΔE 0.032
- Steel Blue #4682B4 ΔE 0.037
- Off Blue #5684AE ΔE 0.044
- Dusty Blue #5A86AD ΔE 0.046
- Faded Blue #658CBB ΔE 0.049
- Teal Blue #01889F ΔE 0.056
Use #288EC1 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.