#2373A9
Closest named color: Flat Blue (#3C73A8). oklch(53.4% 0.113 243.2), rgb(35, 115, 169).
Aa
White text reads best on this color (5.12:1).
About this color
#2373A9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.113 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.018 away. White text reads best on it, at 5.12:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.09:1 |
| White text | 5.12:1 |
Values
| HEX | #2373A9 |
| RGB | rgb(35, 115, 169) |
| HSL | hsl(204, 66%, 40%) |
| OKLCH | oklch(53.4% 0.113 243.2) |
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 #2373A9 | 5.12:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #2373A9 | 4.09:1 | AA large text | Lc 29.1 | Dividers and decoration only |
| #2373A9 text on white | 5.12:1 | AA | Lc 75.0 | Content text, not long reading |
| #2373A9 text on black | 4.09:1 | AA large text | Lc -26.7 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEB
oklch(88.6% 0.028 243.1)
-
Step 300
300
#A5C5DF
oklch(80.9% 0.05 242.9)
-
Step 400
400
#73A7D0
oklch(70.7% 0.082 243)
-
Step 500
500
#4C90C3
oklch(63% 0.104 243.1)
-
Step 600
600 (this color)
#2373A9
oklch(53.4% 0.113 243.2)
-
Step 700
700
#1D6697
oklch(49.1% 0.105 243.2)
-
Step 800
800
#1B537B
oklch(42.6% 0.088 243.9)
-
Step 900
900
#1D4563
oklch(37.7% 0.068 243.8)
-
Step 950
950
#12293A
oklch(27.1% 0.043 242.6)
#2373A9 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) | #5A74AB | 0.052 |
| Deuteranopia (no green cones) | #4768A8 | 0.039 |
| Tritanopia (no blue cones) | #008086 | 0.078 |
| Achromatopsia (no color) | #6E6E6E | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2373A9
#2373A9
oklch(53.4% 0.113 243.2)
- #9A5C15
#9A5C15
oklch(53.4% 0.113 63)
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 #2373A9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.018
- Nice Blue #107AB0 ΔE 0.021
- Muted Blue #3B719F ΔE 0.021
- Ocean Blue #03719C ΔE 0.025
- Mid Blue #276AB3 ΔE 0.033
- French Blue #436BAD ΔE 0.033
- Sea Blue #047495 ΔE 0.036
- Dull Blue #49759C ΔE 0.037
Use #2373A9 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.