#018DD5
Closest named color: Water Blue (#0E87CC). oklch(61.7% 0.147 242.2), rgb(1, 141, 213).
Aa
Black text reads best on this color (5.77:1).
About this color
#018DD5 is a medium-dark, vivid blue. In OKLCH its lightness is 62%, its chroma 0.147 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.019 away. Black text reads best on it, at 5.77:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.77:1 |
| White text | 3.63:1 |
Values
| HEX | #018DD5 |
| RGB | rgb(1, 141, 213) |
| HSL | hsl(200, 99%, 42%) |
| OKLCH | oklch(61.7% 0.147 242.2) |
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 #018DD5 | 3.63:1 | AA large text | Lc -68.8 | Content text, not long reading |
| Black text on #018DD5 | 5.77:1 | AA | Lc 40.8 | Non-text elements, placeholder text |
| #018DD5 text on white | 3.63:1 | AA large text | Lc 63.3 | Content text, not long reading |
| #018DD5 text on black | 5.77:1 | AA | Lc -38.4 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DEECF7
oklch(93.6% 0.021 241.4)
-
Step 200
200
#C3DDF2
oklch(88.5% 0.04 242.4)
-
Step 300
300
#98C7EC
oklch(80.9% 0.072 242.5)
-
Step 400
400
#59A9E2
oklch(70.8% 0.115 241.9)
-
Step 500
500 (this color)
#018DD5
oklch(61.7% 0.147 242.2)
-
Step 600
600
#007AB9
oklch(55.5% 0.132 242.1)
-
Step 700
700
#00679D
oklch(49.2% 0.117 242)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466D
oklch(37.8% 0.09 242.2)
-
Step 950
950
#032941
oklch(26.9% 0.061 242.1)
#018DD5 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) | #6A8FD8 | 0.067 |
| Deuteranopia (no green cones) | #4F7FD4 | 0.049 |
| Tritanopia (no blue cones) | #009FA7 | 0.099 |
| Achromatopsia (no color) | #868686 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #018DD5
#018DD5
oklch(61.7% 0.147 242.2)
- #C06E00
#C06E00
oklch(61.7% 0.142 62)
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 #018DD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.019
- Dark Sky Blue #448EE4 ΔE 0.039
- Cool Blue #4984B8 ΔE 0.051
- Blue NCS #118AB2 ΔE 0.053
- Steel Blue #4682B4 ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.057
- Windows Blue #3778BF ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.064
Use #018DD5 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.