#218CE7
Closest named color: Dark Sky Blue (#448EE4). oklch(62.9% 0.165 250), rgb(33, 140, 231).
Aa
Black text reads best on this color (5.96:1).
About this color
#218CE7 is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.165 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.022 away. Black text reads best on it, at 5.96:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.96:1 |
| White text | 3.51:1 |
Values
| HEX | #218CE7 |
| RGB | rgb(33, 140, 231) |
| HSL | hsl(208, 80%, 52%) |
| OKLCH | oklch(62.9% 0.165 250) |
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 #218CE7 | 3.51:1 | AA large text | Lc -67.7 | Content text, not long reading |
| Black text on #218CE7 | 5.96:1 | AA | Lc 41.9 | Non-text elements, placeholder text |
| #218CE7 text on white | 3.51:1 | AA large text | Lc 62.2 | Content text, not long reading |
| #218CE7 text on black | 5.96:1 | AA | Lc -39.5 | 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
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C4DCF6
oklch(88.5% 0.044 250.4)
-
Step 300
300
#99C5F3
oklch(80.9% 0.08 250)
-
Step 400
400
#5DA5ED
oklch(70.6% 0.129 250.1)
-
Step 500
500 (this color)
#218CE7
oklch(62.9% 0.165 250)
-
Step 600
600
#0076CB
oklch(55.7% 0.158 250)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#00518E
oklch(42.8% 0.121 249.9)
-
Step 900
900
#004377
oklch(37.7% 0.106 249.9)
-
Step 950
950
#062846
oklch(27.1% 0.068 249.6)
#218CE7 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) | #5F92EB | 0.051 |
| Deuteranopia (no green cones) | #3F81E5 | 0.030 |
| Tritanopia (no blue cones) | #00A2AE | 0.120 |
| Achromatopsia (no color) | #898989 | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218CE7
#218CE7
oklch(62.9% 0.165 250)
- #BC7700
#BC7700
oklch(62.8% 0.136 69.7)
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 #218CE7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.022
- Dodger Blue #1E90FF ΔE 0.036
- Chefchaouen Blue #4895EF ΔE 0.038
- Water Blue #0E87CC ΔE 0.043
- Soft Blue #6488EA ΔE 0.051
- Cornflower Blue #6495ED ΔE 0.060
- Clear Blue #247AFD ΔE 0.060
- Cool Blue #4984B8 ΔE 0.072
Use #218CE7 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.