#237AB2
Closest named color: Nice Blue (#107AB0). oklch(55.6% 0.118 242.3), rgb(35, 122, 178).
Aa
White text reads best on this color (4.66:1).
About this color
#237AB2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.118 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.008 away. White text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.49:1 |
| White text | 4.66:1 |
Values
| HEX | #237AB2 |
| RGB | rgb(35, 122, 178) |
| HSL | hsl(203, 67%, 42%) |
| OKLCH | oklch(55.6% 0.118 242.3) |
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 #237AB2 | 4.66:1 | AA | Lc -77.5 | Fine for body text |
| Black text on #237AB2 | 4.49:1 | AA large text | Lc 32.1 | Non-text elements, placeholder text |
| #237AB2 text on white | 4.66:1 | AA | Lc 72.0 | Content text, not long reading |
| #237AB2 text on black | 4.49:1 | AA large text | Lc -29.6 | Dividers and decoration only |
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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A3C5E1
oklch(80.8% 0.054 243.3)
-
Step 400
400
#70A7D1
oklch(70.6% 0.085 242.3)
-
Step 500
500
#4791C5
oklch(63.2% 0.108 241.9)
-
Step 600
600 (this color)
#237AB2
oklch(55.6% 0.118 242.3)
-
Step 700
700
#136699
oklch(49% 0.11 242.6)
-
Step 800
800
#15547C
oklch(42.8% 0.09 242)
-
Step 900
900
#1A4564
oklch(37.6% 0.071 243.3)
-
Step 950
950
#10293A
oklch(27% 0.044 240.8)
#237AB2 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) | #607BB4 | 0.056 |
| Deuteranopia (no green cones) | #4C6EB1 | 0.043 |
| Tritanopia (no blue cones) | #00888E | 0.081 |
| Achromatopsia (no color) | #747474 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #237AB2
#237AB2
oklch(55.6% 0.118 242.3)
- #A36119
#A36119
oklch(55.5% 0.118 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 #237AB2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.008
- Flat Blue #3C73A8 ΔE 0.025
- Windows Blue #3778BF ΔE 0.027
- Muted Blue #3B719F ΔE 0.035
- Steel Blue #4682B4 ΔE 0.037
- Cerulean #457B9D ΔE 0.040
- Dull Blue #49759C ΔE 0.041
- Ocean Blue #03719C ΔE 0.044
Use #237AB2 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.