#337FF0
Closest named color: Clear Blue (#247AFD). oklch(61% 0.186 258.6), rgb(51, 127, 240).
Aa
Black text reads best on this color (5.43:1).
About this color
#337FF0 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.186 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.026 away. Black text reads best on it, at 5.43:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.186) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.43:1 |
| White text | 3.86:1 |
Values
| HEX | #337FF0 |
| RGB | rgb(51, 127, 240) |
| HSL | hsl(216, 86%, 57%) |
| OKLCH | oklch(61% 0.186 258.6) |
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 #337FF0 | 3.86:1 | AA large text | Lc -71.1 | Content text, not long reading |
| Black text on #337FF0 | 5.43:1 | AA | Lc 38.5 | Non-text elements, placeholder text |
| #337FF0 text on white | 3.86:1 | AA large text | Lc 65.6 | Content text, not long reading |
| #337FF0 text on black | 5.43:1 | AA | Lc -36.1 | 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
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFB
oklch(88.5% 0.05 257.7)
-
Step 300
300
#9DC2FC
oklch(80.8% 0.092 259.2)
-
Step 400
400
#66A1FA
oklch(70.8% 0.145 258.4)
-
Step 500
500 (this color)
#337FF0
oklch(61% 0.186 258.6)
-
Step 600
600
#106CE6
oklch(55.6% 0.202 258.5)
-
Step 700
700
#0059C8
oklch(49.1% 0.188 258.7)
-
Step 800
800
#084AA2
oklch(42.8% 0.155 258.6)
-
Step 900
900
#123F80
oklch(37.8% 0.12 258.4)
-
Step 950
950
#0C254B
oklch(26.9% 0.077 258.8)
#337FF0 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) | #3F8BF4 | 0.034 |
| Deuteranopia (no green cones) | #007AEE | 0.025 |
| Tritanopia (no blue cones) | #009AAC | 0.143 |
| Achromatopsia (no color) | #828282 | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337FF0
#337FF0
oklch(61% 0.186 258.6)
- #AC7800
#AC7800
oklch(61% 0.127 78.4)
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 #337FF0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.026
- Dodger Blue #1E90FF ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.049
- Cerulean Blue #056EEE ΔE 0.051
- Soft Blue #6488EA ΔE 0.055
- Cornflower #6A79F7 ΔE 0.055
- Royal Blue #4169E1 ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.063
Use #337FF0 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.