#0188D2
Closest named color: Water Blue (#0E87CC). oklch(60.3% 0.148 243.8), rgb(1, 136, 210).
Aa
Black text reads best on this color (5.45:1).
About this color
#0188D2 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.148 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.009 away. Black text reads best on it, at 5.45:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.45:1 |
| White text | 3.85:1 |
Values
| HEX | #0188D2 |
| RGB | rgb(1, 136, 210) |
| HSL | hsl(201, 99%, 41%) |
| OKLCH | oklch(60.3% 0.148 243.8) |
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 #0188D2 | 3.85:1 | AA large text | Lc -70.8 | Content text, not long reading |
| Black text on #0188D2 | 5.45:1 | AA | Lc 38.8 | Non-text elements, placeholder text |
| #0188D2 text on white | 3.85:1 | AA large text | Lc 65.3 | Content text, not long reading |
| #0188D2 text on black | 5.45:1 | AA | Lc -36.4 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C3DDF2
oklch(88.5% 0.04 242.4)
-
Step 300
300
#99C7EC
oklch(81% 0.072 243)
-
Step 400
400
#5BA8E3
oklch(70.7% 0.116 243.6)
-
Step 500
500 (this color)
#0188D2
oklch(60.3% 0.148 243.8)
-
Step 600
600
#0079BC
oklch(55.5% 0.136 243.9)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#005383
oklch(42.6% 0.105 243.8)
-
Step 900
900
#00456E
oklch(37.6% 0.092 243.7)
-
Step 950
950
#042942
oklch(27% 0.061 243.6)
#0188D2 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) | #648BD5 | 0.063 |
| Deuteranopia (no green cones) | #487AD1 | 0.046 |
| Tritanopia (no blue cones) | #009AA3 | 0.101 |
| Achromatopsia (no color) | #828282 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0188D2
#0188D2
oklch(60.3% 0.148 243.8)
- #B96C00
#B96C00
oklch(60.4% 0.137 63.5)
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 #0188D2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.009
- Dark Sky Blue #448EE4 ΔE 0.046
- Cool Blue #4984B8 ΔE 0.048
- Windows Blue #3778BF ΔE 0.048
- Steel Blue #4682B4 ΔE 0.051
- Blue NCS #118AB2 ΔE 0.052
- Nice Blue #107AB0 ΔE 0.060
- Chefchaouen Blue #4895EF ΔE 0.066
Use #0188D2 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.