#237AA5
Closest named color: Nice Blue (#107AB0). oklch(54.9% 0.104 235.3), rgb(35, 122, 165).
Aa
White text reads best on this color (4.77:1).
About this color
#237AA5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.104 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.018 away. White text reads best on it, at 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.39:1 |
| White text | 4.77:1 |
Values
| HEX | #237AA5 |
| RGB | rgb(35, 122, 165) |
| HSL | hsl(200, 65%, 39%) |
| OKLCH | oklch(54.9% 0.104 235.3) |
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 #237AA5 | 4.77:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #237AA5 | 4.39:1 | AA large text | Lc 31.3 | Non-text elements, placeholder text |
| #237AA5 text on white | 4.77:1 | AA | Lc 72.8 | Content text, not long reading |
| #237AA5 text on black | 4.39:1 | AA large text | Lc -28.9 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF2
oklch(93.7% 0.013 233.7)
-
Step 200
200
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A4C6DB
oklch(80.9% 0.047 235.3)
-
Step 400
400
#72A8C9
oklch(70.6% 0.075 236.1)
-
Step 500
500
#4992BB
oklch(63% 0.095 235.7)
-
Step 600
600 (this color)
#237AA5
oklch(54.9% 0.104 235.3)
-
Step 700
700
#16688F
oklch(49% 0.096 235.3)
-
Step 800
800
#175574
oklch(42.6% 0.08 235.3)
-
Step 900
900
#1B475E
oklch(37.8% 0.062 234.6)
-
Step 950
950
#112937
oklch(26.9% 0.04 236.4)
#237AA5 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) | #6579A7 | 0.062 |
| Deuteranopia (no green cones) | #546DA4 | 0.052 |
| Tritanopia (no blue cones) | #008589 | 0.064 |
| Achromatopsia (no color) | #737373 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #237AA5
#237AA5
oklch(54.9% 0.104 235.3)
- #9F5F30
#9F5F30
oklch(54.8% 0.104 54.8)
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 #237AA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.018
- Flat Blue #3C73A8 ΔE 0.026
- Muted Blue #3B719F ΔE 0.028
- Cerulean #457B9D ΔE 0.028
- Dull Blue #49759C ΔE 0.031
- Sea Blue #047495 ΔE 0.032
- Ocean Blue #03719C ΔE 0.032
- Ocean #017B92 ΔE 0.035
Use #237AA5 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.