#2563A9
Closest named color: Mid Blue (#276AB3). oklch(49.7% 0.128 254), rgb(37, 99, 169).
Aa
White text reads best on this color (6.11:1).
About this color
#2563A9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.128 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.024 away. White text reads best on it, at 6.11:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.43:1 |
| White text | 6.11:1 |
Values
| HEX | #2563A9 |
| RGB | rgb(37, 99, 169) |
| HSL | hsl(212, 64%, 40%) |
| OKLCH | oklch(49.7% 0.128 254) |
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 #2563A9 | 6.11:1 | AA | Lc -85.3 | Fine for body text |
| Black text on #2563A9 | 3.43:1 | AA large text | Lc 23.9 | Dividers and decoration only |
| #2563A9 text on white | 6.11:1 | AA | Lc 80.1 | Fine for body text |
| #2563A9 text on black | 3.43:1 | AA large text | Lc -21.7 | 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 700.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CADBF0
oklch(88.5% 0.034 253.7)
-
Step 300
300
#A5C3E9
oklch(80.8% 0.063 254.5)
-
Step 400
400
#74A4DE
oklch(70.8% 0.1 253.7)
-
Step 500
500
#4F8CD4
oklch(63.1% 0.126 253.8)
-
Step 600
600
#3174C2
oklch(55.6% 0.139 254.3)
-
Step 700
700 (this color)
#2563A9
oklch(49.7% 0.128 254)
-
Step 800
800
#1F5087
oklch(42.8% 0.105 253.7)
-
Step 900
900
#1F436C
oklch(37.8% 0.082 253.3)
-
Step 950
950
#13273F
oklch(26.9% 0.052 254)
#2563A9 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) | #4168AC | 0.031 |
| Deuteranopia (no green cones) | #2B5CA8 | 0.019 |
| Tritanopia (no blue cones) | #00747E | 0.097 |
| Achromatopsia (no color) | #626262 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2563A9
#2563A9
oklch(49.7% 0.128 254)
- #855800
#855800
oklch(49.7% 0.105 74.7)
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 #2563A9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.024
- French Blue #436BAD ΔE 0.038
- Peacock Blue #016795 ΔE 0.040
- Denim Blue #3B5B92 ΔE 0.041
- Dusky Blue #475F94 ΔE 0.044
- Denim #3B638C ΔE 0.049
- Ocean Blue #03719C ΔE 0.050
- Muted Blue #3B719F ΔE 0.052
Use #2563A9 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.