#3976C9
Closest named color: Windows Blue (#3778BF). oklch(56.7% 0.143 256.9), rgb(57, 118, 201).
Aa
Black text reads best on this color (4.60:1).
About this color
#3976C9 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.143 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.018 away. Black text reads best on it, at 4.60:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.60:1 |
| White text | 4.55:1 |
Values
| HEX | #3976C9 |
| RGB | rgb(57, 118, 201) |
| HSL | hsl(215, 57%, 51%) |
| OKLCH | oklch(56.7% 0.143 256.9) |
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 #3976C9 | 4.55:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #3976C9 | 4.60:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #3976C9 text on white | 4.55:1 | AA | Lc 71.3 | Content text, not long reading |
| #3976C9 text on black | 4.60:1 | AA | Lc -30.4 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADBF1
oklch(88.6% 0.035 254.9)
-
Step 300
300
#A6C3EB
oklch(80.9% 0.065 256.5)
-
Step 400
400
#76A3E0
oklch(70.8% 0.102 256.2)
-
Step 500
500
#528AD8
oklch(63.1% 0.132 257)
-
Step 600
600 (this color)
#3976C9
oklch(56.7% 0.143 256.9)
-
Step 700
700
#2860AA
oklch(49.2% 0.132 256.6)
-
Step 800
800
#224E8A
oklch(42.6% 0.111 257)
-
Step 900
900
#21426E
oklch(37.8% 0.085 256.3)
-
Step 950
950
#142741
oklch(27.1% 0.055 256.6)
#3976C9 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) | #4F7DCC | 0.031 |
| Deuteranopia (no green cones) | #3770C7 | 0.017 |
| Tritanopia (no blue cones) | #008996 | 0.111 |
| Achromatopsia (no color) | #767676 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3976C9
#3976C9
oklch(56.7% 0.143 256.9)
- #9D6C00
#9D6C00
oklch(56.8% 0.119 77.4)
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 #3976C9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.018
- Water Blue #0E87CC ΔE 0.047
- French Blue #436BAD ΔE 0.048
- Mid Blue #276AB3 ΔE 0.049
- Nice Blue #107AB0 ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.051
- Royal Blue #4169E1 ΔE 0.053
- Steel Blue #4682B4 ΔE 0.054
Use #3976C9 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.