#3370F5
Closest named color: Cerulean Blue (#056EEE). oklch(58.3% 0.21 263), rgb(51, 112, 245).
Aa
Black text reads best on this color (4.77:1).
About this color
#3370F5 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.210 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.025 away. Black text reads best on it, at 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.210) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.77:1 |
| White text | 4.39:1 |
Values
| HEX | #3370F5 |
| RGB | rgb(51, 112, 245) |
| HSL | hsl(221, 91%, 58%) |
| OKLCH | oklch(58.3% 0.21 263) |
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 #3370F5 | 4.39:1 | AA large text | Lc -75.4 | Fine for body text |
| Black text on #3370F5 | 4.77:1 | AA | Lc 34.2 | Non-text elements, placeholder text |
| #3370F5 text on white | 4.39:1 | AA large text | Lc 69.9 | Content text, not long reading |
| #3370F5 text on black | 4.77:1 | AA | Lc -31.8 | Non-text elements, placeholder text |
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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C7DAFD
oklch(88.5% 0.053 262.7)
-
Step 300
300
#A1C1FE
oklch(81% 0.094 263)
-
Step 400
400
#6D9EFE
oklch(70.7% 0.151 262.7)
-
Step 500
500
#4882FC
oklch(63.2% 0.192 263)
-
Step 600
600 (this color)
#3370F5
oklch(58.3% 0.21 263)
-
Step 700
700
#1F55CD
oklch(49.2% 0.195 263)
-
Step 800
800
#1B46A5
oklch(42.6% 0.161 263)
-
Step 900
900
#1B3C83
oklch(37.6% 0.126 263)
-
Step 950
950
#10244D
oklch(27% 0.08 262.7)
#3370F5 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) | #0082FA | 0.044 |
| Deuteranopia (no green cones) | #0070F2 | 0.021 |
| Tritanopia (no blue cones) | #0091A8 | 0.162 |
| Achromatopsia (no color) | #787878 | 0.210 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3370F5
#3370F5
oklch(58.3% 0.21 263)
- #9E7300
#9E7300
oklch(58.3% 0.12 82.4)
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 #3370F5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.025
- Clear Blue #247AFD ΔE 0.026
- Royal Blue #4169E1 ΔE 0.034
- Neon Blue #4361EE ΔE 0.036
- Bright Blue #0165FC ΔE 0.039
- Azul #1D5DEC ΔE 0.052
- Cornflower #6A79F7 ΔE 0.064
- Warm Blue #4B57DB ΔE 0.069
Use #3370F5 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.