#218AEF
Closest named color: Dodger Blue (#1E90FF). oklch(62.9% 0.176 252.5), rgb(33, 138, 239).
Aa
Black text reads best on this color (5.94:1).
About this color
#218AEF is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.176 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dodger Blue (#1E90FF), ΔE 0.027 away. Black text reads best on it, at 5.94:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.176) |
| Temperature | cool |
| Nearest name | Dodger Blue (#1E90FF) |
| Black text | 5.94:1 |
| White text | 3.53:1 |
Values
| HEX | #218AEF |
| RGB | rgb(33, 138, 239) |
| HSL | hsl(209, 87%, 53%) |
| OKLCH | oklch(62.9% 0.176 252.5) |
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 #218AEF | 3.53:1 | AA large text | Lc -67.8 | Content text, not long reading |
| Black text on #218AEF | 5.94:1 | AA | Lc 41.8 | Non-text elements, placeholder text |
| #218AEF text on white | 3.53:1 | AA large text | Lc 62.3 | Content text, not long reading |
| #218AEF text on black | 5.94:1 | AA | Lc -39.4 | 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
#DEEBFB
oklch(93.5% 0.026 253.6)
-
Step 200
200
#C3DCF9
oklch(88.5% 0.048 252.2)
-
Step 300
300
#99C5F7
oklch(81% 0.085 252.1)
-
Step 400
400
#5CA4F4
oklch(70.7% 0.139 252.5)
-
Step 500
500 (this color)
#218AEF
oklch(62.9% 0.176 252.5)
-
Step 600
600
#0073D2
oklch(55.5% 0.17 252.7)
-
Step 700
700
#0061B2
oklch(49.2% 0.149 252.5)
-
Step 800
800
#004F93
oklch(42.7% 0.13 252.6)
-
Step 900
900
#00427C
oklch(37.8% 0.114 252.4)
-
Step 950
950
#062749
oklch(27.1% 0.073 252.8)
#218AEF 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) | #5692F3 | 0.045 |
| Deuteranopia (no green cones) | #2E80ED | 0.025 |
| Tritanopia (no blue cones) | #00A2B1 | 0.129 |
| Achromatopsia (no color) | #888888 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218AEF
#218AEF
oklch(62.9% 0.176 252.5)
- #BA7900
#BA7900
oklch(62.9% 0.135 72)
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 #218AEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dodger Blue #1E90FF ΔE 0.027
- Dark Sky Blue #448EE4 ΔE 0.030
- Chefchaouen Blue #4895EF ΔE 0.041
- Clear Blue #247AFD ΔE 0.048
- Soft Blue #6488EA ΔE 0.051
- Water Blue #0E87CC ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.062
- Cornflower #6A79F7 ΔE 0.070
Use #218AEF 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.