#2663BD
Closest named color: Mid Blue (#276AB3). oklch(51.1% 0.155 258.5), rgb(38, 99, 189).
Aa
White text reads best on this color (5.83:1).
About this color
#2663BD is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.155 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.027 away. White text reads best on it, at 5.83:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.60:1 |
| White text | 5.83:1 |
Values
| HEX | #2663BD |
| RGB | rgb(38, 99, 189) |
| HSL | hsl(216, 67%, 45%) |
| OKLCH | oklch(51.1% 0.155 258.5) |
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 #2663BD | 5.83:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #2663BD | 3.60:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #2663BD text on white | 5.83:1 | AA | Lc 78.7 | Fine for body text |
| #2663BD text on black | 3.60:1 | AA large text | Lc -23.1 | 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
#C9DAF5
oklch(88.4% 0.042 259.6)
-
Step 300
300
#A3C2F1
oklch(80.8% 0.075 258.6)
-
Step 400
400
#71A2EB
oklch(70.8% 0.12 258.1)
-
Step 500
500
#4B88E5
oklch(63.1% 0.154 258.6)
-
Step 600
600
#2D70D3
oklch(55.7% 0.167 258.5)
-
Step 700
700 (this color)
#2663BD
oklch(51.1% 0.155 258.5)
-
Step 800
800
#1C4C94
oklch(42.6% 0.129 258.7)
-
Step 900
900
#1D4076
oklch(37.6% 0.101 258.9)
-
Step 950
950
#122645
oklch(27% 0.064 258.9)
#2663BD 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) | #306CC0 | 0.027 |
| Deuteranopia (no green cones) | #005FBB | 0.021 |
| Tritanopia (no blue cones) | #007987 | 0.120 |
| Achromatopsia (no color) | #656565 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2663BD
#2663BD
oklch(51.1% 0.155 258.5)
- #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 #2663BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.027
- French Blue #436BAD ΔE 0.046
- Windows Blue #3778BF ΔE 0.062
- Royal Blue #4169E1 ΔE 0.064
- Flat Blue #3C73A8 ΔE 0.065
- Warm Blue #4B57DB ΔE 0.066
- Dusky Blue #475F94 ΔE 0.069
- Denim Blue #3B5B92 ΔE 0.069
Use #2663BD 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.