#2B66CB
Closest named color: Mid Blue (#276AB3). oklch(52.9% 0.169 260.4), rgb(43, 102, 203).
Aa
White text reads best on this color (5.43:1).
About this color
#2B66CB is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.169 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.041 away. White text reads best on it, at 5.43:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.86:1 |
| White text | 5.43:1 |
Values
| HEX | #2B66CB |
| RGB | rgb(43, 102, 203) |
| HSL | hsl(218, 65%, 48%) |
| OKLCH | oklch(52.9% 0.169 260.4) |
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 #2B66CB | 5.43:1 | AA | Lc -81.9 | Fine for body text |
| Black text on #2B66CB | 3.86:1 | AA large text | Lc 27.5 | Dividers and decoration only |
| #2B66CB text on white | 5.43:1 | AA | Lc 76.6 | Fine for body text |
| #2B66CB text on black | 3.86:1 | AA large text | Lc -25.1 | 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 600.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A5C2F2
oklch(80.9% 0.075 260.4)
-
Step 400
400
#74A1EC
oklch(70.8% 0.121 260.2)
-
Step 500
500
#4F87E6
oklch(63.1% 0.155 260.3)
-
Step 600
600 (this color)
#2B66CB
oklch(52.9% 0.169 260.4)
-
Step 700
700
#265CB8
oklch(49.2% 0.157 260.4)
-
Step 800
800
#214B95
oklch(42.6% 0.131 260.8)
-
Step 900
900
#204076
oklch(37.8% 0.1 260.2)
-
Step 950
950
#132645
oklch(27.1% 0.063 259.7)
#2B66CB 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) | #2871CF | 0.029 |
| Deuteranopia (no green cones) | #0063C9 | 0.022 |
| Tritanopia (no blue cones) | #007E8F | 0.130 |
| Achromatopsia (no color) | #6A6A6A | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B66CB
#2B66CB
oklch(52.9% 0.169 260.4)
- #8C6300
#8C6300
oklch(52.9% 0.109 80.2)
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 #2B66CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.041
- Royal Blue #4169E1 ΔE 0.041
- Warm Blue #4B57DB ΔE 0.052
- French Blue #436BAD ΔE 0.055
- Cerulean Blue #056EEE ΔE 0.056
- Azul #1D5DEC ΔE 0.057
- Windows Blue #3778BF ΔE 0.057
- Neon Blue #4361EE ΔE 0.060
Use #2B66CB 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.