#337DF7
Closest named color: Clear Blue (#247AFD). oklch(61.1% 0.197 260), rgb(51, 125, 247).
Aa
Black text reads best on this color (5.41:1).
About this color
#337DF7 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.197 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.015 away. Black text reads best on it, at 5.41:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.197) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.41:1 |
| White text | 3.87:1 |
Values
| HEX | #337DF7 |
| RGB | rgb(51, 125, 247) |
| HSL | hsl(217, 92%, 58%) |
| OKLCH | oklch(61.1% 0.197 260) |
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 #337DF7 | 3.87:1 | AA large text | Lc -71.2 | Content text, not long reading |
| Black text on #337DF7 | 5.41:1 | AA | Lc 38.4 | Non-text elements, placeholder text |
| #337DF7 text on white | 3.87:1 | AA large text | Lc 65.7 | Content text, not long reading |
| #337DF7 text on black | 5.41:1 | AA | Lc -36.0 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DAFD
oklch(88.4% 0.054 260.6)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400
#669FFF
oklch(70.7% 0.154 260.3)
-
Step 500
500 (this color)
#337DF7
oklch(61.1% 0.197 260)
-
Step 600
600
#1269ED
oklch(55.6% 0.214 260)
-
Step 700
700
#0156CF
oklch(49.1% 0.2 260.1)
-
Step 800
800
#0947A7
oklch(42.6% 0.166 260.2)
-
Step 900
900
#123D84
oklch(37.6% 0.129 260.1)
-
Step 950
950
#0C254D
oklch(27.1% 0.08 259.5)
#337DF7 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) | #318BFB | 0.036 |
| Deuteranopia (no green cones) | #0079F5 | 0.024 |
| Tritanopia (no blue cones) | #009BAE | 0.153 |
| Achromatopsia (no color) | #818181 | 0.197 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337DF7
#337DF7
oklch(61.1% 0.197 260)
- #AB7900
#AB7900
oklch(61.1% 0.127 79.7)
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 #337DF7, closest first.
No curated palette has a color within ΔE 0.04 of #337DF7.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.015
- Dodger Blue #1E90FF ΔE 0.048
- Cerulean Blue #056EEE ΔE 0.048
- Cornflower #6A79F7 ΔE 0.053
- Royal Blue #4169E1 ΔE 0.056
- Dark Sky Blue #448EE4 ΔE 0.059
- Soft Blue #6488EA ΔE 0.061
- Neon Blue #4361EE ΔE 0.066
Use #337DF7 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.