#337CE0
Closest named color: Clear Blue (#247AFD). oklch(59.3% 0.169 257.3), rgb(51, 124, 224).
Aa
Black text reads best on this color (5.10:1).
About this color
#337CE0 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.169 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.045 away. Black text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.10:1 |
| White text | 4.11:1 |
Values
| HEX | #337CE0 |
| RGB | rgb(51, 124, 224) |
| HSL | hsl(215, 74%, 54%) |
| OKLCH | oklch(59.3% 0.169 257.3) |
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 #337CE0 | 4.11:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #337CE0 | 5.10:1 | AA | Lc 36.2 | Non-text elements, placeholder text |
| #337CE0 text on white | 4.11:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #337CE0 text on black | 5.10:1 | AA | Lc -33.8 | 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 600.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A2C3F2
oklch(81% 0.076 257.2)
-
Step 400
400
#6FA2EB
oklch(70.7% 0.121 257.4)
-
Step 500
500
#4789E5
oklch(63.1% 0.155 257.2)
-
Step 600
600 (this color)
#337CE0
oklch(59.3% 0.169 257.3)
-
Step 700
700
#195DB7
oklch(49% 0.157 257.5)
-
Step 800
800
#184D94
oklch(42.7% 0.129 257.3)
-
Step 900
900
#1A4176
oklch(37.8% 0.101 257)
-
Step 950
950
#102645
oklch(26.9% 0.064 257.3)
#337CE0 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) | #4885E4 | 0.032 |
| Deuteranopia (no green cones) | #2276DE | 0.021 |
| Tritanopia (no blue cones) | #0094A3 | 0.130 |
| Achromatopsia (no color) | #7D7D7D | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337CE0
#337CE0
oklch(59.3% 0.169 257.3)
- #A77300
#A77300
oklch(59.4% 0.124 77.3)
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 #337CE0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.045
- Royal Blue #4169E1 ΔE 0.048
- Water Blue #0E87CC ΔE 0.048
- Cerulean Blue #056EEE ΔE 0.050
- Windows Blue #3778BF ΔE 0.050
- Dark Sky Blue #448EE4 ΔE 0.052
- Soft Blue #6488EA ΔE 0.061
- Dodger Blue #1E90FF ΔE 0.064
Use #337CE0 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.