#2573AB
Closest named color: Flat Blue (#3C73A8). oklch(53.6% 0.115 244.5), rgb(37, 115, 171).
Aa
White text reads best on this color (5.09:1).
About this color
#2573AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.115 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.017 away. White text reads best on it, at 5.09:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.11:1 |
| White text | 5.09:1 |
Values
| HEX | #2573AB |
| RGB | rgb(37, 115, 171) |
| HSL | hsl(205, 64%, 41%) |
| OKLCH | oklch(53.6% 0.115 244.5) |
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 #2573AB | 5.09:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #2573AB | 4.11:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #2573AB text on white | 5.09:1 | AA | Lc 74.8 | Content text, not long reading |
| #2573AB text on black | 4.11:1 | AA large text | Lc -26.9 | 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
#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
#A5C5E0
oklch(80.9% 0.052 243.9)
-
Step 400
400
#74A6D1
oklch(70.6% 0.083 245.3)
-
Step 500
500
#4D90C5
oklch(63.2% 0.105 244.5)
-
Step 600
600 (this color)
#2573AB
oklch(53.6% 0.115 244.5)
-
Step 700
700
#1E6699
oklch(49.2% 0.107 244.4)
-
Step 800
800
#1C537C
oklch(42.7% 0.089 244.9)
-
Step 900
900
#1D4564
oklch(37.7% 0.07 244.6)
-
Step 950
950
#12293A
oklch(27.1% 0.043 242.6)
#2573AB 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) | #5975AD | 0.050 |
| Deuteranopia (no green cones) | #4668AA | 0.038 |
| Tritanopia (no blue cones) | #008187 | 0.081 |
| Achromatopsia (no color) | #6E6E6E | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2573AB
#2573AB
oklch(53.6% 0.115 244.5)
- #9A5D10
#9A5D10
oklch(53.5% 0.115 64.8)
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 #2573AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.017
- Nice Blue #107AB0 ΔE 0.020
- Muted Blue #3B719F ΔE 0.023
- Ocean Blue #03719C ΔE 0.029
- Mid Blue #276AB3 ΔE 0.031
- French Blue #436BAD ΔE 0.031
- Windows Blue #3778BF ΔE 0.037
- Dull Blue #49759C ΔE 0.038
Use #2573AB 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.