#337BAD
Closest named color: Nice Blue (#107AB0). oklch(56% 0.105 242.4), rgb(51, 123, 173).
Aa
White text reads best on this color (4.58:1).
About this color
#337BAD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.105 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.018 away. White text reads best on it, at 4.58:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.57:1 |
| White text | 4.58:1 |
Values
| HEX | #337BAD |
| RGB | rgb(51, 123, 173) |
| HSL | hsl(205, 54%, 44%) |
| OKLCH | oklch(56% 0.105 242.4) |
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 #337BAD | 4.58:1 | AA | Lc -77.1 | Fine for body text |
| Black text on #337BAD | 4.57:1 | AA | Lc 32.5 | Non-text elements, placeholder text |
| #337BAD text on white | 4.58:1 | AA | Lc 71.6 | Content text, not long reading |
| #337BAD text on black | 4.57:1 | AA | Lc -30.1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CBDCE9
oklch(88.6% 0.026 240.7)
-
Step 300
300
#A7C5DD
oklch(80.9% 0.047 242.4)
-
Step 400
400
#76A7CC
oklch(70.7% 0.075 241.7)
-
Step 500
500
#5090BF
oklch(63% 0.097 242.3)
-
Step 600
600 (this color)
#337BAD
oklch(56% 0.105 242.4)
-
Step 700
700
#236693
oklch(49% 0.098 242.3)
-
Step 800
800
#1F5478
oklch(42.8% 0.082 242)
-
Step 900
900
#204560
oklch(37.6% 0.063 242.6)
-
Step 950
950
#142938
oklch(27.1% 0.039 241.3)
#337BAD 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) | #647CAF | 0.051 |
| Deuteranopia (no green cones) | #5370AC | 0.040 |
| Tritanopia (no blue cones) | #00878C | 0.075 |
| Achromatopsia (no color) | #757575 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337BAD
#337BAD
oklch(56% 0.105 242.4)
- #A0652A
#A0652A
oklch(56% 0.106 62.3)
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 #337BAD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.018
- Flat Blue #3C73A8 ΔE 0.022
- Cerulean #457B9D ΔE 0.028
- Steel Blue #4682B4 ΔE 0.029
- Dull Blue #49759C ΔE 0.031
- Muted Blue #3B719F ΔE 0.032
- Windows Blue #3778BF ΔE 0.032
- Stormy Blue #507B9C ΔE 0.036
Use #337BAD 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.