#266FCB
Closest named color: Windows Blue (#3778BF). oklch(54.7% 0.159 256.3), rgb(38, 111, 203).
Aa
White text reads best on this color (4.97:1).
About this color
#266FCB is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.159 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.037 away. White text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.21:1 |
| White text | 4.97:1 |
Values
| HEX | #266FCB |
| RGB | rgb(38, 111, 203) |
| HSL | hsl(213, 68%, 47%) |
| OKLCH | oklch(54.7% 0.159 256.3) |
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 #266FCB | 4.97:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #266FCB | 4.21:1 | AA large text | Lc 30.1 | Non-text elements, placeholder text |
| #266FCB text on white | 4.97:1 | AA | Lc 74.0 | Content text, not long reading |
| #266FCB text on black | 4.21:1 | AA large text | Lc -27.7 | 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
#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
#A3C3EF
oklch(80.9% 0.072 256.4)
-
Step 400
400
#70A3E7
oklch(70.8% 0.114 255.9)
-
Step 500
500
#498AE0
oklch(63.1% 0.146 256.2)
-
Step 600
600 (this color)
#266FCB
oklch(54.7% 0.159 256.3)
-
Step 700
700
#1B5FB2
oklch(49.1% 0.148 256.1)
-
Step 800
800
#194E90
oklch(42.7% 0.122 256.1)
-
Step 900
900
#1B4173
oklch(37.6% 0.096 256.4)
-
Step 950
950
#112743
oklch(27.1% 0.059 255.4)
#266FCB 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) | #3E78CE | 0.033 |
| Deuteranopia (no green cones) | #1669C9 | 0.020 |
| Tritanopia (no blue cones) | #008593 | 0.121 |
| Achromatopsia (no color) | #707070 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #266FCB
#266FCB
oklch(54.7% 0.159 256.3)
- #966600
#966600
oklch(54.7% 0.115 76.5)
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 #266FCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.037
- Mid Blue #276AB3 ΔE 0.038
- Royal Blue #4169E1 ΔE 0.044
- French Blue #436BAD ΔE 0.049
- Cerulean Blue #056EEE ΔE 0.054
- Nice Blue #107AB0 ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.060
- Water Blue #0E87CC ΔE 0.065
Use #266FCB 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.