#377DF4
Closest named color: Clear Blue (#247AFD). oklch(61% 0.192 260.4), rgb(55, 125, 244).
Aa
Black text reads best on this color (5.40:1).
About this color
#377DF4 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.192 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.020 away. Black text reads best on it, at 5.40:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.192) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.40:1 |
| White text | 3.88:1 |
Values
| HEX | #377DF4 |
| RGB | rgb(55, 125, 244) |
| HSL | hsl(218, 90%, 59%) |
| OKLCH | oklch(61% 0.192 260.4) |
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 #377DF4 | 3.88:1 | AA large text | Lc -71.3 | Content text, not long reading |
| Black text on #377DF4 | 5.40:1 | AA | Lc 38.3 | Non-text elements, placeholder text |
| #377DF4 text on white | 3.88:1 | AA large text | Lc 65.8 | Content text, not long reading |
| #377DF4 text on black | 5.40:1 | AA | Lc -35.8 | 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 500.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFD
oklch(93.7% 0.027 260.3)
-
Step 200
200
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9EC2FE
oklch(81% 0.094 260.4)
-
Step 400
400
#689FFD
oklch(70.6% 0.15 260.5)
-
Step 500
500 (this color)
#377DF4
oklch(61% 0.192 260.4)
-
Step 600
600
#1A69EA
oklch(55.5% 0.209 260.4)
-
Step 700
700
#0B57CC
oklch(49.1% 0.194 260.3)
-
Step 800
800
#0F48A5
oklch(42.8% 0.161 260.4)
-
Step 900
900
#153D83
oklch(37.6% 0.126 260.7)
-
Step 950
950
#0D254C
oklch(27% 0.078 259.7)
#377DF4 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) | #368AF8 | 0.033 |
| Deuteranopia (no green cones) | #0079F2 | 0.026 |
| Tritanopia (no blue cones) | #009AAD | 0.150 |
| Achromatopsia (no color) | #818181 | 0.192 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #377DF4
#377DF4
oklch(61% 0.192 260.4)
- #AA7900
#AA7900
oklch(61% 0.126 80.2)
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 #377DF4, closest first.
No curated palette has a color within ΔE 0.04 of #377DF4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.020
- Dodger Blue #1E90FF ΔE 0.048
- Cerulean Blue #056EEE ΔE 0.049
- Cornflower #6A79F7 ΔE 0.051
- Royal Blue #4169E1 ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.056
- Soft Blue #6488EA ΔE 0.057
- Neon Blue #4361EE ΔE 0.066
Use #377DF4 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.