#337ED2
Closest named color: Water Blue (#0E87CC). oklch(58.9% 0.148 253.7), rgb(51, 126, 210).
Aa
Black text reads best on this color (5.05:1).
About this color
#337ED2 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.148 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.030 away. Black text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #337ED2 |
| RGB | rgb(51, 126, 210) |
| HSL | hsl(212, 64%, 51%) |
| OKLCH | oklch(58.9% 0.148 253.7) |
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 #337ED2 | 4.15:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #337ED2 | 5.05:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #337ED2 text on white | 4.15:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #337ED2 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C9DBF2
oklch(88.5% 0.037 254.6)
-
Step 300
300
#A3C4EC
oklch(81% 0.067 253.5)
-
Step 400
400
#70A4E2
oklch(70.7% 0.107 253.5)
-
Step 500
500
#498CDA
oklch(63.2% 0.136 253.7)
-
Step 600
600 (this color)
#337ED2
oklch(58.9% 0.148 253.7)
-
Step 700
700
#1A61AC
oklch(49.1% 0.138 253.7)
-
Step 800
800
#184F8B
oklch(42.6% 0.114 253.8)
-
Step 900
900
#1B426F
oklch(37.6% 0.089 253.9)
-
Step 950
950
#112741
oklch(26.9% 0.056 253.9)
#337ED2 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) | #5684D5 | 0.037 |
| Deuteranopia (no green cones) | #3C76D0 | 0.021 |
| Tritanopia (no blue cones) | #00929E | 0.112 |
| Achromatopsia (no color) | #7C7C7C | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337ED2
#337ED2
oklch(58.9% 0.148 253.7)
- #A86F00
#A86F00
oklch(58.7% 0.125 73.7)
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 #337ED2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.030
- Windows Blue #3778BF ΔE 0.031
- Cool Blue #4984B8 ΔE 0.050
- Steel Blue #4682B4 ΔE 0.052
- Dark Sky Blue #448EE4 ΔE 0.052
- Nice Blue #107AB0 ΔE 0.058
- Royal Blue #4169E1 ΔE 0.061
- Flat Blue #3C73A8 ΔE 0.066
Use #337ED2 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.