#3971AD
Closest named color: Flat Blue (#3C73A8). oklch(53.9% 0.112 252), rgb(57, 113, 173).
Aa
White text reads best on this color (5.07:1).
About this color
#3971AD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.112 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.011 away. White text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.13:1 |
| White text | 5.07:1 |
Values
| HEX | #3971AD |
| RGB | rgb(57, 113, 173) |
| HSL | hsl(211, 50%, 45%) |
| OKLCH | oklch(53.9% 0.112 252) |
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 #3971AD | 5.07:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #3971AD | 4.13:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #3971AD text on white | 5.07:1 | AA | Lc 74.8 | Content text, not long reading |
| #3971AD text on black | 4.13:1 | AA large text | Lc -26.9 | 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 600.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CCDBEC
oklch(88.5% 0.029 251.5)
-
Step 300
300
#AAC3E1
oklch(80.8% 0.051 253.1)
-
Step 400
400
#7CA4D2
oklch(70.7% 0.081 252.4)
-
Step 500
500
#598DC6
oklch(63.1% 0.103 251.8)
-
Step 600
600 (this color)
#3971AD
oklch(53.9% 0.112 252)
-
Step 700
700
#30639A
oklch(49.1% 0.104 252.2)
-
Step 800
800
#29517C
oklch(42.7% 0.085 251.9)
-
Step 900
900
#254364
oklch(37.6% 0.067 252.1)
-
Step 950
950
#16283B
oklch(27.1% 0.043 250.9)
#3971AD 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) | #5774B0 | 0.035 |
| Deuteranopia (no green cones) | #4669AC | 0.024 |
| Tritanopia (no blue cones) | #007F87 | 0.087 |
| Achromatopsia (no color) | #6E6E6E | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3971AD
#3971AD
oklch(53.9% 0.112 252)
- #96620C
#96620C
oklch(54% 0.112 71.9)
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 #3971AD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.011
- French Blue #436BAD ΔE 0.018
- Muted Blue #3B719F ΔE 0.022
- Mid Blue #276AB3 ΔE 0.029
- Nice Blue #107AB0 ΔE 0.030
- Windows Blue #3778BF ΔE 0.031
- Dull Blue #49759C ΔE 0.035
- Ocean Blue #03719C ΔE 0.041
Use #3971AD 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.