#2A66BB
Closest named color: Mid Blue (#276AB3). oklch(51.7% 0.148 257.8), rgb(42, 102, 187).
Aa
White text reads best on this color (5.65:1).
About this color
#2A66BB is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.148 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.018 away. White text reads best on it, at 5.65:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.71:1 |
| White text | 5.65:1 |
Values
| HEX | #2A66BB |
| RGB | rgb(42, 102, 187) |
| HSL | hsl(215, 63%, 45%) |
| OKLCH | oklch(51.7% 0.148 257.8) |
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 #2A66BB | 5.65:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #2A66BB | 3.71:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #2A66BB text on white | 5.65:1 | AA | Lc 77.8 | Fine for body text |
| #2A66BB text on black | 3.71:1 | AA large text | Lc -23.9 | 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
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF4
oklch(88.6% 0.04 256.6)
-
Step 300
300
#A4C3EF
oklch(81% 0.071 257.1)
-
Step 400
400
#73A2E7
oklch(70.7% 0.114 257.9)
-
Step 500
500
#4D89E0
oklch(63.1% 0.146 257.8)
-
Step 600
600
#2F71CE
oklch(55.6% 0.159 257.7)
-
Step 700
700 (this color)
#2A66BB
oklch(51.7% 0.148 257.8)
-
Step 800
800
#1E4D90
oklch(42.6% 0.122 257.9)
-
Step 900
900
#1E4173
oklch(37.7% 0.095 257.6)
-
Step 950
950
#122643
oklch(26.9% 0.06 257.7)
#2A66BB 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) | #396EBE | 0.027 |
| Deuteranopia (no green cones) | #1961B9 | 0.019 |
| Tritanopia (no blue cones) | #007A87 | 0.114 |
| Achromatopsia (no color) | #676767 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A66BB
#2A66BB
oklch(51.7% 0.148 257.8)
- #8A5F00
#8A5F00
oklch(51.8% 0.108 77.9)
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 #2A66BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.018
- French Blue #436BAD ΔE 0.036
- Windows Blue #3778BF ΔE 0.053
- Flat Blue #3C73A8 ΔE 0.055
- Muted Blue #3B719F ΔE 0.061
- Nice Blue #107AB0 ΔE 0.062
- Royal Blue #4169E1 ΔE 0.064
- Dusky Blue #475F94 ΔE 0.065
Use #2A66BB 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.