#3371B3
Closest named color: French Blue (#436BAD). oklch(54% 0.122 252.3), rgb(51, 113, 179).
Aa
White text reads best on this color (5.05:1).
About this color
#3371B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.122 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.020 away. White text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #3371B3 |
| RGB | rgb(51, 113, 179) |
| HSL | hsl(211, 56%, 45%) |
| OKLCH | oklch(54% 0.122 252.3) |
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 #3371B3 | 5.05:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #3371B3 | 4.15:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #3371B3 text on white | 5.05:1 | AA | Lc 74.6 | Content text, not long reading |
| #3371B3 text on black | 4.15:1 | AA large text | Lc -27.1 | 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
#CBDBED
oklch(88.5% 0.03 251.3)
-
Step 300
300
#A8C4E4
oklch(81% 0.055 251.9)
-
Step 400
400
#78A4D6
oklch(70.6% 0.088 252.2)
-
Step 500
500
#548DCB
oklch(63.1% 0.112 251.8)
-
Step 600
600 (this color)
#3371B3
oklch(54% 0.122 252.3)
-
Step 700
700
#2A639F
oklch(49.2% 0.113 252.2)
-
Step 800
800
#245181
oklch(42.8% 0.094 252.2)
-
Step 900
900
#224367
oklch(37.6% 0.073 252.1)
-
Step 950
950
#15283C
oklch(27.1% 0.045 250.9)
#3371B3 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) | #5375B6 | 0.036 |
| Deuteranopia (no green cones) | #4069B2 | 0.023 |
| Tritanopia (no blue cones) | #008089 | 0.093 |
| Achromatopsia (no color) | #6F6F6F | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3371B3
#3371B3
oklch(54% 0.122 252.3)
- #976200
#976200
oklch(54% 0.115 72.5)
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 #3371B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.020
- Flat Blue #3C73A8 ΔE 0.021
- Mid Blue #276AB3 ΔE 0.023
- Windows Blue #3778BF ΔE 0.026
- Nice Blue #107AB0 ΔE 0.030
- Muted Blue #3B719F ΔE 0.032
- Dull Blue #49759C ΔE 0.045
- Ocean Blue #03719C ΔE 0.045
Use #3371B3 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.