#3972B3
Closest named color: Flat Blue (#3C73A8). oklch(54.5% 0.118 253.4), rgb(57, 114, 179).
Aa
White text reads best on this color (4.96:1).
About this color
#3972B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.118 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.018 away. White text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.23:1 |
| White text | 4.96:1 |
Values
| HEX | #3972B3 |
| RGB | rgb(57, 114, 179) |
| HSL | hsl(212, 52%, 46%) |
| OKLCH | oklch(54.5% 0.118 253.4) |
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 #3972B3 | 4.96:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #3972B3 | 4.23:1 | AA large text | Lc 30.0 | Dividers and decoration only |
| #3972B3 text on white | 4.96:1 | AA | Lc 74.1 | Content text, not long reading |
| #3972B3 text on black | 4.23:1 | AA large text | Lc -27.6 | 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
#CCDBED
oklch(88.6% 0.03 253)
-
Step 300
300
#A9C3E3
oklch(80.8% 0.054 253.8)
-
Step 400
400
#7BA4D5
oklch(70.8% 0.085 253.3)
-
Step 500
500
#588CCA
oklch(63% 0.109 253.7)
-
Step 600
600 (this color)
#3972B3
oklch(54.5% 0.118 253.4)
-
Step 700
700
#2E629D
oklch(49% 0.11 253.4)
-
Step 800
800
#27507F
oklch(42.6% 0.091 253.4)
-
Step 900
900
#254366
oklch(37.7% 0.07 253.4)
-
Step 950
950
#16273C
oklch(26.9% 0.046 254.4)
#3972B3 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) | #5576B6 | 0.033 |
| Deuteranopia (no green cones) | #446BB2 | 0.020 |
| Tritanopia (no blue cones) | #00818A | 0.093 |
| Achromatopsia (no color) | #707070 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3972B3
#3972B3
oklch(54.5% 0.118 253.4)
- #986400
#986400
oklch(54.6% 0.116 73.7)
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 #3972B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.018
- French Blue #436BAD ΔE 0.020
- Windows Blue #3778BF ΔE 0.023
- Mid Blue #276AB3 ΔE 0.029
- Nice Blue #107AB0 ΔE 0.031
- Muted Blue #3B719F ΔE 0.031
- Dull Blue #49759C ΔE 0.042
- Ocean Blue #03719C ΔE 0.048
Use #3972B3 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.