#2563DD
Closest named color: Azul (#1D5DEC). oklch(53.5% 0.197 262), rgb(37, 99, 221).
Aa
White text reads best on this color (5.37:1).
About this color
#2563DD is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.197 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Azul (#1D5DEC), ΔE 0.028 away. White text reads best on it, at 5.37:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.197) |
| Temperature | cool |
| Nearest name | Azul (#1D5DEC) |
| Black text | 3.90:1 |
| White text | 5.37:1 |
Values
| HEX | #2563DD |
| RGB | rgb(37, 99, 221) |
| HSL | hsl(220, 73%, 51%) |
| OKLCH | oklch(53.5% 0.197 262) |
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 #2563DD | 5.37:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #2563DD | 3.90:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #2563DD text on white | 5.37:1 | AA | Lc 76.1 | Fine for body text |
| #2563DD text on black | 3.90:1 | AA large text | Lc -25.6 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C8DAFB
oklch(88.5% 0.05 262.6)
-
Step 300
300
#A1C1FB
oklch(80.8% 0.09 262.1)
-
Step 400
400
#6F9FF9
oklch(70.8% 0.142 262.1)
-
Step 500
500
#4984F5
oklch(63.2% 0.18 261.9)
-
Step 600
600 (this color)
#2563DD
oklch(53.5% 0.197 262)
-
Step 700
700
#1F57C6
oklch(49% 0.183 262)
-
Step 800
800
#1B48A0
oklch(42.6% 0.151 261.9)
-
Step 900
900
#1C3E7F
oklch(37.8% 0.117 261.8)
-
Step 950
950
#11254B
oklch(27.1% 0.075 261.8)
#2563DD 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) | #0073E1 | 0.039 |
| Deuteranopia (no green cones) | #0062DB | 0.015 |
| Tritanopia (no blue cones) | #008296 | 0.153 |
| Achromatopsia (no color) | #6A6A6A | 0.198 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2563DD
#2563DD
oklch(53.5% 0.197 262)
- #8D6500
#8D6500
oklch(53.4% 0.11 81.3)
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 #2563DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Azul #1D5DEC ΔE 0.028
- Royal Blue #4169E1 ΔE 0.031
- Cerulean Blue #056EEE ΔE 0.036
- Neon Blue #4361EE ΔE 0.037
- Warm Blue #4B57DB ΔE 0.040
- Bright Blue #0165FC ΔE 0.048
- Electric Blue #0652FF ΔE 0.065
- Mid Blue #276AB3 ΔE 0.070
Use #2563DD 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.