#337EDF
Closest named color: Water Blue (#0E87CC). oklch(59.7% 0.165 256.4), rgb(51, 126, 223).
Aa
Black text reads best on this color (5.19:1).
About this color
#337EDF is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.165 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.044 away. Black text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.19:1 |
| White text | 4.04:1 |
Values
| HEX | #337EDF |
| RGB | rgb(51, 126, 223) |
| HSL | hsl(214, 73%, 54%) |
| OKLCH | oklch(59.7% 0.165 256.4) |
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 #337EDF | 4.04:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #337EDF | 5.19:1 | AA | Lc 36.8 | Non-text elements, placeholder text |
| #337EDF text on white | 4.04:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #337EDF text on black | 5.19:1 | AA | Lc -34.4 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9FC3F5
oklch(80.9% 0.081 256.7)
-
Step 400
400
#69A2F0
oklch(70.6% 0.13 256.5)
-
Step 500
500 (this color)
#337EDF
oklch(59.7% 0.165 256.4)
-
Step 600
600
#1770D9
oklch(55.6% 0.179 256.4)
-
Step 700
700
#065DBC
oklch(49.1% 0.167 256.4)
-
Step 800
800
#0C4D98
oklch(42.8% 0.137 256.1)
-
Step 900
900
#144179
oklch(37.8% 0.107 256)
-
Step 950
950
#0E2647
oklch(27% 0.068 257.1)
#337EDF 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) | #4D87E3 | 0.035 |
| Deuteranopia (no green cones) | #2A77DD | 0.021 |
| Tritanopia (no blue cones) | #0095A3 | 0.127 |
| Achromatopsia (no color) | #7E7E7E | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337EDF
#337EDF
oklch(59.7% 0.165 256.4)
- #A97300
#A97300
oklch(59.6% 0.125 76.2)
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 #337EDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.044
- Dark Sky Blue #448EE4 ΔE 0.047
- Clear Blue #247AFD ΔE 0.048
- Windows Blue #3778BF ΔE 0.049
- Royal Blue #4169E1 ΔE 0.053
- Cerulean Blue #056EEE ΔE 0.055
- Soft Blue #6488EA ΔE 0.059
- Dodger Blue #1E90FF ΔE 0.061
Use #337EDF 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.