#2187B3
Closest named color: Blue NCS (#118AB2). oklch(58.8% 0.111 232.5), rgb(33, 135, 179).
Aa
Black text reads best on this color (5.18:1).
About this color
#2187B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.111 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.010 away. Black text reads best on it, at 5.18:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.18:1 |
| White text | 4.05:1 |
Values
| HEX | #2187B3 |
| RGB | rgb(33, 135, 179) |
| HSL | hsl(198, 69%, 42%) |
| OKLCH | oklch(58.8% 0.111 232.5) |
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 #2187B3 | 4.05:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #2187B3 | 5.18:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #2187B3 text on white | 4.05:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #2187B3 text on black | 5.18:1 | AA | Lc -34.3 | 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
#C8DDE9
oklch(88.6% 0.028 232.7)
-
Step 300
300
#A1C7DC
oklch(80.9% 0.05 232.4)
-
Step 400
400
#6CAACA
oklch(70.8% 0.079 231.9)
-
Step 500
500
#3F94BD
oklch(63.2% 0.102 232.6)
-
Step 600
600 (this color)
#2187B3
oklch(58.8% 0.111 232.5)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#075676
oklch(42.7% 0.086 233.1)
-
Step 900
900
#14475F
oklch(37.6% 0.067 233.2)
-
Step 950
950
#0E2A38
oklch(27.1% 0.042 233.2)
#2187B3 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) | #7186B5 | 0.071 |
| Deuteranopia (no green cones) | #5E78B2 | 0.061 |
| Tritanopia (no blue cones) | #009396 | 0.066 |
| Achromatopsia (no color) | #7E7E7E | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2187B3
#2187B3
oklch(58.8% 0.111 232.5)
- #AF6839
#AF6839
oklch(58.7% 0.11 52.4)
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 #2187B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.010
- Steel Blue #4682B4 ΔE 0.027
- Cool Blue #4984B8 ΔE 0.030
- Teal Blue #01889F ΔE 0.035
- Off Blue #5684AE ΔE 0.039
- Water Blue #0E87CC ΔE 0.039
- Nice Blue #107AB0 ΔE 0.040
- Dusty Blue #5A86AD ΔE 0.043
Use #2187B3 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.