#337F99
Closest named color: Cerulean (#457B9D). oklch(56% 0.084 224), rgb(51, 127, 153).
Aa
Black text reads best on this color (4.63:1).
About this color
#337F99 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 56%, its chroma 0.084 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.020 away. Black text reads best on it, at 4.63:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.63:1 |
| White text | 4.52:1 |
Values
| HEX | #337F99 |
| RGB | rgb(51, 127, 153) |
| HSL | hsl(195, 50%, 40%) |
| OKLCH | oklch(56% 0.084 224) |
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 #337F99 | 4.52:1 | AA | Lc -76.7 | Fine for body text |
| Black text on #337F99 | 4.63:1 | AA | Lc 32.9 | Non-text elements, placeholder text |
| #337F99 text on white | 4.52:1 | AA | Lc 71.2 | Content text, not long reading |
| #337F99 text on black | 4.63:1 | AA | Lc -30.5 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3ECEF
oklch(93.7% 0.01 219.6)
-
Step 200
200
#CBDCE3
oklch(88.4% 0.021 224.3)
-
Step 300
300
#A7C6D3
oklch(80.8% 0.038 225.1)
-
Step 400
400
#77A9BD
oklch(70.7% 0.06 224.8)
-
Step 500
500
#5194AC
oklch(63.2% 0.077 223.5)
-
Step 600
600 (this color)
#337F99
oklch(56% 0.084 224)
-
Step 700
700
#236A81
oklch(49.1% 0.078 223.5)
-
Step 800
800
#1F5669
oklch(42.6% 0.065 224.4)
-
Step 900
900
#204755
oklch(37.6% 0.05 224.1)
-
Step 950
950
#142A32
oklch(27.1% 0.032 223.6)
#337F99 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) | #707C9A | 0.065 |
| Deuteranopia (no green cones) | #627299 | 0.058 |
| Tritanopia (no blue cones) | #008787 | 0.047 |
| Achromatopsia (no color) | #767676 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337F99
#337F99
oklch(56% 0.084 224)
- #9E644B
#9E644B
oklch(56.1% 0.084 43.9)
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 #337F99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.020
- Ocean #017B92 ΔE 0.028
- Teal Blue #01889F ΔE 0.028
- Stormy Blue #507B9C ΔE 0.029
- Dull Blue #49759C ΔE 0.035
- Metallic Blue #4F738E ΔE 0.039
- Sea Blue #047495 ΔE 0.042
- Blue NCS #118AB2 ΔE 0.043
Use #337F99 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.