#337DF1
Closest named color: Clear Blue (#247AFD). oklch(60.7% 0.189 259.4), rgb(51, 125, 241).
Aa
Black text reads best on this color (5.34:1).
About this color
#337DF1 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.189 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.022 away. Black text reads best on it, at 5.34:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.189) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.34:1 |
| White text | 3.92:1 |
Values
| HEX | #337DF1 |
| RGB | rgb(51, 125, 241) |
| HSL | hsl(217, 87%, 57%) |
| OKLCH | oklch(60.7% 0.189 259.4) |
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 #337DF1 | 3.92:1 | AA large text | Lc -71.7 | Content text, not long reading |
| Black text on #337DF1 | 5.34:1 | AA | Lc 37.9 | Non-text elements, placeholder text |
| #337DF1 text on white | 3.92:1 | AA large text | Lc 66.2 | Content text, not long reading |
| #337DF1 text on black | 5.34:1 | AA | Lc -35.5 | 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
#C5DBFC
oklch(88.6% 0.051 258.4)
-
Step 300
300
#9DC2FD
oklch(80.9% 0.093 259.6)
-
Step 400
400
#66A0FC
oklch(70.7% 0.149 259.3)
-
Step 500
500 (this color)
#337DF1
oklch(60.7% 0.189 259.4)
-
Step 600
600
#146BE9
oklch(55.7% 0.206 259.4)
-
Step 700
700
#0358CA
oklch(49.1% 0.191 259.3)
-
Step 800
800
#0A49A3
oklch(42.7% 0.158 259.2)
-
Step 900
900
#133E82
oklch(37.7% 0.124 259.6)
-
Step 950
950
#0C254C
oklch(27% 0.079 259.2)
#337DF1 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) | #398AF5 | 0.035 |
| Deuteranopia (no green cones) | #0078EF | 0.026 |
| Tritanopia (no blue cones) | #0099AB | 0.147 |
| Achromatopsia (no color) | #808080 | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337DF1
#337DF1
oklch(60.7% 0.189 259.4)
- #AA7800
#AA7800
oklch(60.8% 0.126 79.4)
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 #337DF1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.022
- Cerulean Blue #056EEE ΔE 0.046
- Dodger Blue #1E90FF ΔE 0.050
- Royal Blue #4169E1 ΔE 0.052
- Cornflower #6A79F7 ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.055
- Soft Blue #6488EA ΔE 0.059
- Neon Blue #4361EE ΔE 0.066
Use #337DF1 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.