#3770FE
Closest named color: Clear Blue (#247AFD). oklch(59.2% 0.22 264.2), rgb(55, 112, 254).
Aa
Black text reads best on this color (4.91:1).
About this color
#3770FE is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.220 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.024 away. Black text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.220) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 4.91:1 |
| White text | 4.27:1 |
Values
| HEX | #3770FE |
| RGB | rgb(55, 112, 254) |
| HSL | hsl(223, 99%, 61%) |
| OKLCH | oklch(59.2% 0.22 264.2) |
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 #3770FE | 4.27:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #3770FE | 4.91:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #3770FE text on white | 4.27:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #3770FE text on black | 4.91:1 | AA | Lc -32.7 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C7DAFF
oklch(88.6% 0.055 263.7)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4A80FF
oklch(63.1% 0.198 264.2)
-
Step 600
600 (this color)
#3770FE
oklch(59.2% 0.22 264.2)
-
Step 700
700
#2152D2
oklch(49.1% 0.204 264.1)
-
Step 800
800
#1C44AA
oklch(42.7% 0.17 264.1)
-
Step 900
900
#1C3B86
oklch(37.7% 0.131 264.1)
-
Step 950
950
#11234F
oklch(27% 0.084 264.6)
#3770FE 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) | #0084FF | 0.048 |
| Deuteranopia (no green cones) | #0071FB | 0.023 |
| Tritanopia (no blue cones) | #0094AC | 0.173 |
| Achromatopsia (no color) | #7A7A7A | 0.220 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3770FE
#3770FE
oklch(59.2% 0.22 264.2)
- #9F7600
#9F7600
oklch(59.1% 0.121 84.2)
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 #3770FE, closest first.
No curated palette has a color within ΔE 0.04 of #3770FE.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.024
- Cerulean Blue #056EEE ΔE 0.035
- Bright Blue #0165FC ΔE 0.040
- Neon Blue #4361EE ΔE 0.041
- Royal Blue #4169E1 ΔE 0.046
- Azul #1D5DEC ΔE 0.058
- Cornflower #6A79F7 ΔE 0.062
- Electric Blue #0652FF ΔE 0.076
Use #3770FE 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.