#337898
Closest named color: Cerulean (#457B9D). oklch(54.3% 0.085 231.4), rgb(51, 120, 152).
Aa
White text reads best on this color (4.90:1).
About this color
#337898 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.085 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.021 away. White text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.28:1 |
| White text | 4.90:1 |
Values
| HEX | #337898 |
| RGB | rgb(51, 120, 152) |
| HSL | hsl(199, 50%, 40%) |
| OKLCH | oklch(54.3% 0.085 231.4) |
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 #337898 | 4.90:1 | AA | Lc -79.2 | Fine for body text |
| Black text on #337898 | 4.28:1 | AA large text | Lc 30.3 | Non-text elements, placeholder text |
| #337898 text on white | 4.90:1 | AA | Lc 73.8 | Content text, not long reading |
| #337898 text on black | 4.28:1 | AA large text | Lc -27.9 | 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
#CCDCE5
oklch(88.5% 0.021 232.2)
-
Step 300
300
#A9C6D5
oklch(81% 0.038 230.3)
-
Step 400
400
#79A8C0
oklch(70.7% 0.061 230.9)
-
Step 500
500
#5592B0
oklch(63% 0.078 231.1)
-
Step 600
600 (this color)
#337898
oklch(54.3% 0.085 231.4)
-
Step 700
700
#296885
oklch(49% 0.079 231.5)
-
Step 800
800
#24556C
oklch(42.6% 0.065 231.4)
-
Step 900
900
#234658
oklch(37.6% 0.051 232.8)
-
Step 950
950
#152933
oklch(26.9% 0.032 231.4)
#337898 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) | #68769A | 0.058 |
| Deuteranopia (no green cones) | #5A6C98 | 0.050 |
| Tritanopia (no blue cones) | #008183 | 0.054 |
| Achromatopsia (no color) | #717171 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337898
#337898
oklch(54.3% 0.085 231.4)
- #976140
#976140
oklch(54.4% 0.085 51.6)
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 #337898, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.021
- Dull Blue #49759C ΔE 0.023
- Ocean #017B92 ΔE 0.026
- Muted Blue #3B719F ΔE 0.027
- Sea Blue #047495 ΔE 0.027
- Metallic Blue #4F738E ΔE 0.029
- Stormy Blue #507B9C ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.034
Use #337898 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.