#337BA0
Closest named color: Cerulean (#457B9D). oklch(55.4% 0.091 234.3), rgb(51, 123, 160).
Aa
White text reads best on this color (4.68:1).
About this color
#337BA0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.091 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.015 away. White text reads best on it, at 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.48:1 |
| White text | 4.68:1 |
Values
| HEX | #337BA0 |
| RGB | rgb(51, 123, 160) |
| HSL | hsl(200, 52%, 41%) |
| OKLCH | oklch(55.4% 0.091 234.3) |
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 #337BA0 | 4.68:1 | AA | Lc -77.7 | Fine for body text |
| Black text on #337BA0 | 4.48:1 | AA large text | Lc 31.8 | Non-text elements, placeholder text |
| #337BA0 text on white | 4.68:1 | AA | Lc 72.3 | Content text, not long reading |
| #337BA0 text on black | 4.48:1 | AA large text | Lc -29.4 | Dividers and decoration only |
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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CBDCE6
oklch(88.5% 0.023 233.4)
-
Step 300
300
#A8C6D8
oklch(81% 0.041 234.4)
-
Step 400
400
#78A8C4
oklch(70.8% 0.066 234.5)
-
Step 500
500
#5292B5
oklch(63.1% 0.084 234.2)
-
Step 600
600 (this color)
#337BA0
oklch(55.4% 0.091 234.3)
-
Step 700
700
#25688A
oklch(49.1% 0.086 234.7)
-
Step 800
800
#215570
oklch(42.7% 0.071 234.6)
-
Step 900
900
#21465A
oklch(37.6% 0.054 234.4)
-
Step 950
950
#142935
oklch(26.9% 0.035 235.2)
#337BA0 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) | #697AA2 | 0.057 |
| Deuteranopia (no green cones) | #5A6F9F | 0.048 |
| Tritanopia (no blue cones) | #008587 | 0.061 |
| Achromatopsia (no color) | #747474 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337BA0
#337BA0
oklch(55.4% 0.091 234.3)
- #9C633C
#9C633C
oklch(55.4% 0.092 54)
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 #337BA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.015
- Dull Blue #49759C ΔE 0.023
- Stormy Blue #507B9C ΔE 0.027
- Muted Blue #3B719F ΔE 0.029
- Flat Blue #3C73A8 ΔE 0.030
- Nice Blue #107AB0 ΔE 0.030
- Ocean #017B92 ΔE 0.033
- Sea Blue #047495 ΔE 0.036
Use #337BA0 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.