#218DEF
Closest named color: Dodger Blue (#1E90FF). oklch(63.6% 0.173 251.4), rgb(33, 141, 239).
Aa
Black text reads best on this color (6.12:1).
About this color
#218DEF is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.173 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dodger Blue (#1E90FF), ΔE 0.024 away. Black text reads best on it, at 6.12:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Dodger Blue (#1E90FF) |
| Black text | 6.12:1 |
| White text | 3.43:1 |
Values
| HEX | #218DEF |
| RGB | rgb(33, 141, 239) |
| HSL | hsl(209, 87%, 53%) |
| OKLCH | oklch(63.6% 0.173 251.4) |
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 #218DEF | 3.43:1 | AA large text | Lc -66.7 | Content text, not long reading |
| Black text on #218DEF | 6.12:1 | AA | Lc 42.8 | Non-text elements, placeholder text |
| #218DEF text on white | 3.43:1 | AA large text | Lc 61.3 | Content text, not long reading |
| #218DEF text on black | 6.12:1 | AA | Lc -40.4 | 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
#DEEBFA
oklch(93.5% 0.025 251.9)
-
Step 200
200
#C3DCF8
oklch(88.5% 0.047 251.3)
-
Step 300
300
#98C5F6
oklch(80.9% 0.085 251)
-
Step 400
400
#5CA5F2
oklch(70.8% 0.135 251.4)
-
Step 500
500 (this color)
#218DEF
oklch(63.6% 0.173 251.4)
-
Step 600
600
#0074CF
oklch(55.5% 0.165 251.7)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900
#00427A
oklch(37.7% 0.112 251.7)
-
Step 950
950
#052748
oklch(27% 0.072 251.7)
#218DEF 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) | #5C94F3 | 0.048 |
| Deuteranopia (no green cones) | #3782ED | 0.028 |
| Tritanopia (no blue cones) | #00A5B2 | 0.128 |
| Achromatopsia (no color) | #8A8A8A | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218DEF
#218DEF
oklch(63.6% 0.173 251.4)
- #BD7A00
#BD7A00
oklch(63.5% 0.136 71.3)
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 #218DEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dodger Blue #1E90FF ΔE 0.024
- Dark Sky Blue #448EE4 ΔE 0.026
- Chefchaouen Blue #4895EF ΔE 0.034
- Soft Blue #6488EA ΔE 0.050
- Water Blue #0E87CC ΔE 0.055
- Clear Blue #247AFD ΔE 0.055
- Cornflower Blue #6495ED ΔE 0.057
- Cornflower #6A79F7 ΔE 0.074
Use #218DEF 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.