#018ADA
Closest named color: Water Blue (#0E87CC). oklch(61.3% 0.155 245.4), rgb(1, 138, 218).
Aa
Black text reads best on this color (5.64:1).
About this color
#018ADA is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.155 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.021 away. Black text reads best on it, at 5.64:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.64:1 |
| White text | 3.71:1 |
Values
| HEX | #018ADA |
| RGB | rgb(1, 138, 218) |
| HSL | hsl(202, 99%, 43%) |
| OKLCH | oklch(61.3% 0.155 245.4) |
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 #018ADA | 3.71:1 | AA large text | Lc -69.5 | Content text, not long reading |
| Black text on #018ADA | 5.64:1 | AA | Lc 40.0 | Non-text elements, placeholder text |
| #018ADA text on white | 3.71:1 | AA large text | Lc 64.0 | Content text, not long reading |
| #018ADA text on black | 5.64:1 | AA | Lc -37.6 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF8
oklch(93.6% 0.022 243.8)
-
Step 200
200
#C3DDF4
oklch(88.6% 0.042 245)
-
Step 300
300
#98C6EF
oklch(80.8% 0.076 245.8)
-
Step 400
400
#5AA8E7
oklch(70.8% 0.121 245.1)
-
Step 500
500 (this color)
#018ADA
oklch(61.3% 0.155 245.4)
-
Step 600
600
#0079C0
oklch(55.7% 0.141 245.3)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#004570
oklch(37.7% 0.095 244.9)
-
Step 950
950
#042943
oklch(27.1% 0.063 244.6)
#018ADA 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) | #638EDD | 0.062 |
| Deuteranopia (no green cones) | #457DD8 | 0.042 |
| Tritanopia (no blue cones) | #009EA7 | 0.109 |
| Achromatopsia (no color) | #848484 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #018ADA
#018ADA
oklch(61.3% 0.155 245.4)
- #BB7000
#BB7000
oklch(61.4% 0.137 65.4)
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 #018ADA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.021
- Dark Sky Blue #448EE4 ΔE 0.036
- Chefchaouen Blue #4895EF ΔE 0.056
- Cool Blue #4984B8 ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.058
- Windows Blue #3778BF ΔE 0.058
- Steel Blue #4682B4 ΔE 0.061
- Blue NCS #118AB2 ΔE 0.062
Use #018ADA 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.