#2188B3
Closest named color: Blue NCS (#118AB2). oklch(59% 0.11 231.7), rgb(33, 136, 179).
Aa
Black text reads best on this color (5.23:1).
About this color
#2188B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.110 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.008 away. Black text reads best on it, at 5.23:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.23:1 |
| White text | 4.00:1 |
Values
| HEX | #2188B3 |
| RGB | rgb(33, 136, 179) |
| HSL | hsl(198, 69%, 42%) |
| OKLCH | oklch(59% 0.11 231.7) |
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 #2188B3 | 4.00:1 | AA large text | Lc -72.5 | Content text, not long reading |
| Black text on #2188B3 | 5.23:1 | AA | Lc 37.1 | Non-text elements, placeholder text |
| #2188B3 text on white | 4.00:1 | AA large text | Lc 67.0 | Content text, not long reading |
| #2188B3 text on black | 5.23:1 | AA | Lc -34.7 | 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 600.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDE8
oklch(88.5% 0.027 230.4)
-
Step 300
300
#A1C7DB
oklch(80.9% 0.049 231.1)
-
Step 400
400
#6CAACA
oklch(70.8% 0.079 231.9)
-
Step 500
500
#3E94BC
oklch(63.1% 0.101 231.7)
-
Step 600
600 (this color)
#2188B3
oklch(59% 0.11 231.7)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#055675
oklch(42.6% 0.085 232)
-
Step 900
900
#13475E
oklch(37.6% 0.066 231.8)
-
Step 950
950
#0E2A37
oklch(27% 0.041 231.2)
#2188B3 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) | #7286B5 | 0.072 |
| Deuteranopia (no green cones) | #5F79B2 | 0.061 |
| Tritanopia (no blue cones) | #009497 | 0.065 |
| Achromatopsia (no color) | #7F7F7F | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2188B3
#2188B3
oklch(59% 0.11 231.7)
- #B0693B
#B0693B
oklch(59% 0.11 52)
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 #2188B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.008
- Steel Blue #4682B4 ΔE 0.028
- Cool Blue #4984B8 ΔE 0.030
- Teal Blue #01889F ΔE 0.034
- Off Blue #5684AE ΔE 0.039
- Water Blue #0E87CC ΔE 0.040
- Nice Blue #107AB0 ΔE 0.042
- Dusty Blue #5A86AD ΔE 0.043
Use #2188B3 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.