#2563BB
Closest named color: Mid Blue (#276AB3). oklch(50.9% 0.153 258), rgb(37, 99, 187).
Aa
White text reads best on this color (5.86:1).
About this color
#2563BB is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.153 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.025 away. White text reads best on it, at 5.86:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.58:1 |
| White text | 5.86:1 |
Values
| HEX | #2563BB |
| RGB | rgb(37, 99, 187) |
| HSL | hsl(215, 67%, 44%) |
| OKLCH | oklch(50.9% 0.153 258) |
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 #2563BB | 5.86:1 | AA | Lc -84.1 | Fine for body text |
| Black text on #2563BB | 3.58:1 | AA large text | Lc 25.2 | Dividers and decoration only |
| #2563BB text on white | 5.86:1 | AA | Lc 78.9 | Fine for body text |
| #2563BB text on black | 3.58:1 | AA large text | Lc -22.9 | 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 700.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DBF5
oklch(88.6% 0.041 257.5)
-
Step 300
300
#A3C3F1
oklch(81% 0.074 257.4)
-
Step 400
400
#71A2EA
oklch(70.7% 0.119 257.9)
-
Step 500
500
#4B89E3
oklch(63.2% 0.15 257.8)
-
Step 600
600
#2D70D1
oklch(55.5% 0.164 258.2)
-
Step 700
700 (this color)
#2563BB
oklch(50.9% 0.153 258)
-
Step 800
800
#1C4D92
oklch(42.7% 0.125 257.8)
-
Step 900
900
#1D4175
oklch(37.8% 0.098 257.9)
-
Step 950
950
#122644
oklch(26.9% 0.062 258.3)
#2563BB 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) | #326CBE | 0.028 |
| Deuteranopia (no green cones) | #035EB9 | 0.022 |
| Tritanopia (no blue cones) | #007886 | 0.117 |
| Achromatopsia (no color) | #656565 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2563BB
#2563BB
oklch(50.9% 0.153 258)
- #875D00
#875D00
oklch(51% 0.106 78)
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 #2563BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.025
- French Blue #436BAD ΔE 0.044
- Windows Blue #3778BF ΔE 0.062
- Flat Blue #3C73A8 ΔE 0.063
- Denim Blue #3B5B92 ΔE 0.066
- Dusky Blue #475F94 ΔE 0.066
- Royal Blue #4169E1 ΔE 0.067
- Peacock Blue #016795 ΔE 0.067
Use #2563BB 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.