#3370D7
Closest named color: Royal Blue (#4169E1). oklch(56.1% 0.171 260.2), rgb(51, 112, 215).
Aa
White text reads best on this color (4.73:1).
About this color
#3370D7 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.171 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.026 away. White text reads best on it, at 4.73:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.43:1 |
| White text | 4.73:1 |
Values
| HEX | #3370D7 |
| RGB | rgb(51, 112, 215) |
| HSL | hsl(218, 67%, 52%) |
| OKLCH | oklch(56.1% 0.171 260.2) |
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 #3370D7 | 4.73:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #3370D7 | 4.43:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #3370D7 text on white | 4.73:1 | AA | Lc 72.4 | Content text, not long reading |
| #3370D7 text on black | 4.43:1 | AA large text | Lc -29.3 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAF9
oklch(93.5% 0.023 260.7)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A4C2F3
oklch(80.9% 0.077 260.1)
-
Step 400
400
#73A1ED
oklch(70.8% 0.123 260.1)
-
Step 500
500
#4E87E7
oklch(63.1% 0.157 260.2)
-
Step 600
600 (this color)
#3370D7
oklch(56.1% 0.171 260.2)
-
Step 700
700
#245CB9
oklch(49.2% 0.159 260.1)
-
Step 800
800
#1F4B95
oklch(42.6% 0.131 260.2)
-
Step 900
900
#1F4077
oklch(37.8% 0.102 260)
-
Step 950
950
#132646
oklch(27.1% 0.065 260.2)
#3370D7 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) | #367BDB | 0.030 |
| Deuteranopia (no green cones) | #006CD5 | 0.027 |
| Tritanopia (no blue cones) | #008999 | 0.134 |
| Achromatopsia (no color) | #737373 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3370D7
#3370D7
oklch(56.1% 0.171 260.2)
- #986C00
#986C00
oklch(56.2% 0.116 80.4)
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 #3370D7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.026
- Cerulean Blue #056EEE ΔE 0.040
- Windows Blue #3778BF ΔE 0.046
- Neon Blue #4361EE ΔE 0.053
- Mid Blue #276AB3 ΔE 0.058
- Clear Blue #247AFD ΔE 0.060
- Azul #1D5DEC ΔE 0.062
- Warm Blue #4B57DB ΔE 0.062
Use #3370D7 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.