#3370B8
Closest named color: Mid Blue (#276AB3). oklch(54.1% 0.129 254.4), rgb(51, 112, 184).
Aa
White text reads best on this color (5.05:1).
About this color
#3370B8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.129 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.021 away. White text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #3370B8 |
| RGB | rgb(51, 112, 184) |
| HSL | hsl(212, 57%, 46%) |
| OKLCH | oklch(54.1% 0.129 254.4) |
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 #3370B8 | 5.05:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #3370B8 | 4.15:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #3370B8 text on white | 5.05:1 | AA | Lc 74.6 | Content text, not long reading |
| #3370B8 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CBDBEF
oklch(88.6% 0.033 254)
-
Step 300
300
#A7C3E6
oklch(80.8% 0.058 254.2)
-
Step 400
400
#78A4DA
oklch(70.8% 0.093 254)
-
Step 500
500
#548CD0
oklch(63.2% 0.119 254.2)
-
Step 600
600 (this color)
#3370B8
oklch(54.1% 0.129 254.4)
-
Step 700
700
#2A61A3
oklch(49% 0.121 254.8)
-
Step 800
800
#245084
oklch(42.7% 0.099 254.3)
-
Step 900
900
#22436A
oklch(37.8% 0.078 253.9)
-
Step 950
950
#15273E
oklch(27% 0.049 255.2)
#3370B8 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) | #4F75BB | 0.033 |
| Deuteranopia (no green cones) | #3A69B7 | 0.019 |
| Tritanopia (no blue cones) | #00818B | 0.100 |
| Achromatopsia (no color) | #6F6F6F | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3370B8
#3370B8
oklch(54.1% 0.129 254.4)
- #966300
#966300
oklch(54.1% 0.115 74)
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 #3370B8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.021
- French Blue #436BAD ΔE 0.022
- Windows Blue #3778BF ΔE 0.024
- Flat Blue #3C73A8 ΔE 0.029
- Nice Blue #107AB0 ΔE 0.036
- Muted Blue #3B719F ΔE 0.041
- Ocean Blue #03719C ΔE 0.053
- Dull Blue #49759C ΔE 0.053
Use #3370B8 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.