#2187EB
Closest named color: Dark Sky Blue (#448EE4). oklch(62% 0.175 252.8), rgb(33, 135, 235).
Aa
Black text reads best on this color (5.72:1).
About this color
#2187EB is a medium-dark, vivid blue. In OKLCH its lightness is 62%, its chroma 0.175 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.033 away. Black text reads best on it, at 5.72:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | vivid (0.175) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.72:1 |
| White text | 3.66:1 |
Values
| HEX | #2187EB |
| RGB | rgb(33, 135, 235) |
| HSL | hsl(210, 83%, 53%) |
| OKLCH | oklch(62% 0.175 252.8) |
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 #2187EB | 3.66:1 | AA large text | Lc -69.2 | Content text, not long reading |
| Black text on #2187EB | 5.72:1 | AA | Lc 40.4 | Non-text elements, placeholder text |
| #2187EB text on white | 3.66:1 | AA large text | Lc 63.7 | Content text, not long reading |
| #2187EB text on black | 5.72:1 | AA | Lc -38.0 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C4DCF8
oklch(88.6% 0.047 252.4)
-
Step 300
300
#99C4F7
oklch(80.8% 0.086 253.1)
-
Step 400
400
#5EA4F3
oklch(70.7% 0.136 252.8)
-
Step 500
500 (this color)
#2187EB
oklch(62% 0.175 252.8)
-
Step 600
600
#0073D3
oklch(55.6% 0.171 252.9)
-
Step 700
700
#0061B2
oklch(49.2% 0.149 252.5)
-
Step 800
800
#004F94
oklch(42.8% 0.131 252.8)
-
Step 900
900
#02427B
oklch(37.8% 0.113 252.4)
-
Step 950
950
#072748
oklch(27% 0.071 252.7)
#2187EB 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) | #538FEF | 0.044 |
| Deuteranopia (no green cones) | #2C7DE9 | 0.025 |
| Tritanopia (no blue cones) | #009FAD | 0.130 |
| Achromatopsia (no color) | #868686 | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2187EB
#2187EB
oklch(62% 0.175 252.8)
- #B67700
#B67700
oklch(62% 0.132 72.5)
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 #2187EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.033
- Dodger Blue #1E90FF ΔE 0.036
- Clear Blue #247AFD ΔE 0.045
- Chefchaouen Blue #4895EF ΔE 0.048
- Water Blue #0E87CC ΔE 0.049
- Soft Blue #6488EA ΔE 0.053
- Cerulean Blue #056EEE ΔE 0.068
- Cornflower Blue #6495ED ΔE 0.068
Use #2187EB 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.