#337C99
Closest named color: Cerulean (#457B9D). oklch(55.3% 0.084 227.6), rgb(51, 124, 153).
Aa
White text reads best on this color (4.68:1).
About this color
#337C99 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 55%, its chroma 0.084 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.017 away. White text reads best on it, at 4.68:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.48:1 |
| White text | 4.68:1 |
Values
| HEX | #337C99 |
| RGB | rgb(51, 124, 153) |
| HSL | hsl(197, 50%, 40%) |
| OKLCH | oklch(55.3% 0.084 227.6) |
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 #337C99 | 4.68:1 | AA | Lc -77.7 | Fine for body text |
| Black text on #337C99 | 4.48:1 | AA large text | Lc 31.8 | Non-text elements, placeholder text |
| #337C99 text on white | 4.68:1 | AA | Lc 72.3 | Content text, not long reading |
| #337C99 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CBDCE4
oklch(88.4% 0.021 227.6)
-
Step 300
300
#A8C6D4
oklch(80.9% 0.038 227.7)
-
Step 400
400
#78A9BE
oklch(70.8% 0.06 226.5)
-
Step 500
500
#5393AE
oklch(63.1% 0.077 227.3)
-
Step 600
600 (this color)
#337C99
oklch(55.3% 0.084 227.6)
-
Step 700
700
#266983
oklch(49% 0.078 227.5)
-
Step 800
800
#21566B
oklch(42.7% 0.065 227.5)
-
Step 900
900
#214757
oklch(37.7% 0.051 227.9)
-
Step 950
950
#142A33
oklch(27.1% 0.033 226.5)
#337C99 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) | #6D7A9A | 0.062 |
| Deuteranopia (no green cones) | #5E6F99 | 0.055 |
| Tritanopia (no blue cones) | #008485 | 0.050 |
| Achromatopsia (no color) | #747474 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337C99
#337C99
oklch(55.3% 0.084 227.6)
- #9B6346
#9B6346
oklch(55.4% 0.084 47.8)
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 #337C99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.017
- Ocean #017B92 ΔE 0.025
- Stormy Blue #507B9C ΔE 0.027
- Dull Blue #49759C ΔE 0.028
- Metallic Blue #4F738E ΔE 0.034
- Sea Blue #047495 ΔE 0.035
- Teal Blue #01889F ΔE 0.036
- Muted Blue #3B719F ΔE 0.037
Use #337C99 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.