#3373A7
Closest named color: Flat Blue (#3C73A8). oklch(53.8% 0.105 246), rgb(51, 115, 167).
Aa
White text reads best on this color (5.05:1).
About this color
#3373A7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.105 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.008 away. White text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #3373A7 |
| RGB | rgb(51, 115, 167) |
| HSL | hsl(207, 53%, 43%) |
| OKLCH | oklch(53.8% 0.105 246) |
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 #3373A7 | 5.05:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #3373A7 | 4.15:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #3373A7 text on white | 5.05:1 | AA | Lc 74.7 | Content text, not long reading |
| #3373A7 text on black | 4.15:1 | AA large text | Lc -27.0 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CCDBEA
oklch(88.5% 0.026 248.1)
-
Step 300
300
#A8C4DE
oklch(80.8% 0.048 246.4)
-
Step 400
400
#79A6CD
oklch(70.7% 0.075 245.3)
-
Step 500
500
#558FC0
oklch(63.1% 0.096 245.6)
-
Step 600
600 (this color)
#3373A7
oklch(53.8% 0.105 246)
-
Step 700
700
#2A6594
oklch(49.1% 0.097 245.8)
-
Step 800
800
#255378
oklch(42.8% 0.08 245.5)
-
Step 900
900
#234561
oklch(37.8% 0.063 245.4)
-
Step 950
950
#152839
oklch(26.9% 0.04 246.9)
#3373A7 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) | #5C75A9 | 0.044 |
| Deuteranopia (no green cones) | #4C6AA6 | 0.032 |
| Tritanopia (no blue cones) | #007F85 | 0.077 |
| Achromatopsia (no color) | #6F6F6F | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3373A7
#3373A7
oklch(53.8% 0.105 246)
- #976020
#976020
oklch(53.8% 0.105 65.6)
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 #3373A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.008
- Muted Blue #3B719F ΔE 0.013
- Nice Blue #107AB0 ΔE 0.025
- Dull Blue #49759C ΔE 0.028
- French Blue #436BAD ΔE 0.029
- Ocean Blue #03719C ΔE 0.031
- Cerulean #457B9D ΔE 0.037
- Mid Blue #276AB3 ΔE 0.037
Use #3373A7 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.