#337CDC
Closest named color: Water Blue (#0E87CC). oklch(59.1% 0.163 256.6), rgb(51, 124, 220).
Aa
Black text reads best on this color (5.05:1).
About this color
#337CDC is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.163 and its hue 257°. 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 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #337CDC |
| RGB | rgb(51, 124, 220) |
| HSL | hsl(214, 71%, 53%) |
| OKLCH | oklch(59.1% 0.163 256.6) |
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 #337CDC | 4.15:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #337CDC | 5.05:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #337CDC text on white | 4.15:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #337CDC text on black | 5.05:1 | AA | Lc -33.5 | 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 600.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A2C3F0
oklch(80.9% 0.073 256.2)
-
Step 400
400
#6FA2E9
oklch(70.6% 0.118 256.8)
-
Step 500
500
#4889E2
oklch(63% 0.15 256.9)
-
Step 600
600 (this color)
#337CDC
oklch(59.1% 0.163 256.6)
-
Step 700
700
#1A5EB4
oklch(49% 0.152 256.8)
-
Step 800
800
#184D92
oklch(42.6% 0.126 256.8)
-
Step 900
900
#1B4174
oklch(37.7% 0.098 256.7)
-
Step 950
950
#112644
oklch(26.9% 0.062 257.5)
#337CDC 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) | #4B85E0 | 0.034 |
| Deuteranopia (no green cones) | #2975DA | 0.021 |
| Tritanopia (no blue cones) | #0093A1 | 0.126 |
| Achromatopsia (no color) | #7C7C7C | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337CDC
#337CDC
oklch(59.1% 0.163 256.6)
- #A67200
#A67200
oklch(59.1% 0.124 77.1)
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 #337CDC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.044
- Windows Blue #3778BF ΔE 0.044
- Royal Blue #4169E1 ΔE 0.049
- Clear Blue #247AFD ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.052
- Cerulean Blue #056EEE ΔE 0.053
- Soft Blue #6488EA ΔE 0.063
- Cool Blue #4984B8 ΔE 0.066
Use #337CDC 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.