#2F78CB
Closest named color: Windows Blue (#3778BF). oklch(57% 0.147 254.1), rgb(47, 120, 203).
Aa
Black text reads best on this color (4.66:1).
About this color
#2F78CB is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.147 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.019 away. Black text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.66:1 |
| White text | 4.49:1 |
Values
| HEX | #2F78CB |
| RGB | rgb(47, 120, 203) |
| HSL | hsl(212, 62%, 49%) |
| OKLCH | oklch(57% 0.147 254.1) |
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 #2F78CB | 4.49:1 | AA large text | Lc -76.3 | Fine for body text |
| Black text on #2F78CB | 4.66:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #2F78CB text on white | 4.49:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #2F78CB text on black | 4.66:1 | AA | Lc -30.8 | Non-text elements, placeholder text |
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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C9DBF2
oklch(88.5% 0.037 254.6)
-
Step 300
300
#A4C3EB
oklch(80.8% 0.066 254.9)
-
Step 400
400
#71A4E1
oklch(70.7% 0.105 253.6)
-
Step 500
500
#4A8BD9
oklch(63% 0.136 254.3)
-
Step 600
600 (this color)
#2F78CB
oklch(57% 0.147 254.1)
-
Step 700
700
#1C61AC
oklch(49.2% 0.137 254)
-
Step 800
800
#1A4F8B
oklch(42.6% 0.114 254.3)
-
Step 900
900
#1C426F
oklch(37.6% 0.089 254.4)
-
Step 950
950
#122741
oklch(27% 0.056 254.8)
#2F78CB 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) | #507ECE | 0.036 |
| Deuteranopia (no green cones) | #3570C9 | 0.021 |
| Tritanopia (no blue cones) | #008C97 | 0.113 |
| Achromatopsia (no color) | #777777 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F78CB
#2F78CB
oklch(57% 0.147 254.1)
- #A16B00
#A16B00
oklch(57.1% 0.121 74.3)
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 #2F78CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.019
- Water Blue #0E87CC ΔE 0.041
- Nice Blue #107AB0 ΔE 0.048
- Mid Blue #276AB3 ΔE 0.051
- French Blue #436BAD ΔE 0.053
- Flat Blue #3C73A8 ΔE 0.054
- Steel Blue #4682B4 ΔE 0.054
- Cool Blue #4984B8 ΔE 0.055
Use #2F78CB 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.