#2188DE
Closest named color: Water Blue (#0E87CC). oklch(61.4% 0.158 249.5), rgb(33, 136, 222).
Aa
Black text reads best on this color (5.64:1).
About this color
#2188DE is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.158 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.029 away. Black text reads best on it, at 5.64:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.64:1 |
| White text | 3.72:1 |
Values
| HEX | #2188DE |
| RGB | rgb(33, 136, 222) |
| HSL | hsl(207, 74%, 50%) |
| OKLCH | oklch(61.4% 0.158 249.5) |
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 #2188DE | 3.72:1 | AA large text | Lc -69.8 | Content text, not long reading |
| Black text on #2188DE | 5.64:1 | AA | Lc 39.8 | Non-text elements, placeholder text |
| #2188DE text on white | 3.72:1 | AA large text | Lc 64.3 | Content text, not long reading |
| #2188DE text on black | 5.64:1 | AA | Lc -37.4 | 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
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C4DCF5
oklch(88.5% 0.043 249.4)
-
Step 300
300
#9BC5F1
oklch(80.9% 0.077 250)
-
Step 400
400
#60A6EA
oklch(70.8% 0.123 249.3)
-
Step 500
500 (this color)
#2188DE
oklch(61.4% 0.158 249.5)
-
Step 600
600
#0076C9
oklch(55.6% 0.155 249.4)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#034375
oklch(37.6% 0.103 249.6)
-
Step 950
950
#072845
oklch(27.1% 0.066 249.3)
#2188DE 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) | #5E8DE1 | 0.050 |
| Deuteranopia (no green cones) | #407DDC | 0.031 |
| Tritanopia (no blue cones) | #009DA8 | 0.115 |
| Achromatopsia (no color) | #848484 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2188DE
#2188DE
oklch(61.4% 0.158 249.5)
- #B77300
#B77300
oklch(61.4% 0.134 69.2)
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 #2188DE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.029
- Dark Sky Blue #448EE4 ΔE 0.030
- Chefchaouen Blue #4895EF ΔE 0.051
- Dodger Blue #1E90FF ΔE 0.051
- Soft Blue #6488EA ΔE 0.057
- Windows Blue #3778BF ΔE 0.058
- Cool Blue #4984B8 ΔE 0.060
- Clear Blue #247AFD ΔE 0.063
Use #2188DE 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.