#3370A3
Closest named color: Muted Blue (#3B719F). oklch(52.9% 0.102 246.6), rgb(51, 112, 163).
Aa
White text reads best on this color (5.26:1).
About this color
#3370A3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.102 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.010 away. White text reads best on it, at 5.26:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 3.98:1 |
| White text | 5.26:1 |
Values
| HEX | #3370A3 |
| RGB | rgb(51, 112, 163) |
| HSL | hsl(207, 52%, 42%) |
| OKLCH | oklch(52.9% 0.102 246.6) |
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 #3370A3 | 5.26:1 | AA | Lc -81.3 | Fine for body text |
| Black text on #3370A3 | 3.98:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #3370A3 text on white | 5.26:1 | AA | Lc 75.9 | Fine for body text |
| #3370A3 text on black | 3.98:1 | AA large text | Lc -25.8 | 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
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CCDBE9
oklch(88.4% 0.025 246.2)
-
Step 300
300
#A9C4DD
oklch(80.8% 0.046 246.3)
-
Step 400
400
#7BA5CC
oklch(70.6% 0.073 247)
-
Step 500
500
#588FBF
oklch(63.2% 0.093 246.3)
-
Step 600
600 (this color)
#3370A3
oklch(52.9% 0.102 246.6)
-
Step 700
700
#2D6593
oklch(49.1% 0.095 246.2)
-
Step 800
800
#275278
oklch(42.6% 0.08 247.6)
-
Step 900
900
#244460
oklch(37.6% 0.061 246.7)
-
Step 950
950
#162838
oklch(26.9% 0.038 246.6)
#3370A3 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) | #5972A5 | 0.041 |
| Deuteranopia (no green cones) | #4A67A2 | 0.031 |
| Tritanopia (no blue cones) | #007C82 | 0.076 |
| Achromatopsia (no color) | #6C6C6C | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3370A3
#3370A3
oklch(52.9% 0.102 246.6)
- #935E1F
#935E1F
oklch(52.9% 0.103 66.2)
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 #3370A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.010
- Flat Blue #3C73A8 ΔE 0.014
- Ocean Blue #03719C ΔE 0.026
- French Blue #436BAD ΔE 0.028
- Dull Blue #49759C ΔE 0.030
- Nice Blue #107AB0 ΔE 0.032
- Mid Blue #276AB3 ΔE 0.035
- Sea Blue #047495 ΔE 0.036
Use #3370A3 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.