#337BF8
Closest named color: Clear Blue (#247AFD). oklch(60.8% 0.201 260.6), rgb(51, 123, 248).
Aa
Black text reads best on this color (5.32:1).
About this color
#337BF8 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.201 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.012 away. Black text reads best on it, at 5.32:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.201) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.32:1 |
| White text | 3.94:1 |
Values
| HEX | #337BF8 |
| RGB | rgb(51, 123, 248) |
| HSL | hsl(218, 93%, 59%) |
| OKLCH | oklch(60.8% 0.201 260.6) |
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 #337BF8 | 3.94:1 | AA large text | Lc -71.7 | Content text, not long reading |
| Black text on #337BF8 | 5.32:1 | AA | Lc 37.8 | Non-text elements, placeholder text |
| #337BF8 text on white | 3.94:1 | AA large text | Lc 66.2 | Content text, not long reading |
| #337BF8 text on black | 5.32:1 | AA | Lc -35.4 | 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 500.
-
Step 50
50
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DAFE
oklch(88.4% 0.055 261.2)
-
Step 300
300
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400
#679FFF
oklch(70.7% 0.153 260.6)
-
Step 500
500 (this color)
#337BF8
oklch(60.8% 0.201 260.6)
-
Step 600
600
#1568F0
oklch(55.7% 0.218 260.6)
-
Step 700
700
#0555D1
oklch(49.1% 0.203 260.7)
-
Step 800
800
#0B47A9
oklch(42.8% 0.168 260.6)
-
Step 900
900
#133D85
oklch(37.7% 0.13 260.6)
-
Step 950
950
#0C244E
oklch(26.9% 0.083 260.7)
#337BF8 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) | #288AFC | 0.037 |
| Deuteranopia (no green cones) | #0078F6 | 0.022 |
| Tritanopia (no blue cones) | #0099AE | 0.154 |
| Achromatopsia (no color) | #808080 | 0.201 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337BF8
#337BF8
oklch(60.8% 0.201 260.6)
- #A97900
#A97900
oklch(60.8% 0.126 80.8)
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 #337BF8, closest first.
No curated palette has a color within ΔE 0.04 of #337BF8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.012
- Cerulean Blue #056EEE ΔE 0.044
- Dodger Blue #1E90FF ΔE 0.052
- Royal Blue #4169E1 ΔE 0.053
- Cornflower #6A79F7 ΔE 0.053
- Bright Blue #0165FC ΔE 0.061
- Neon Blue #4361EE ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.064
Use #337BF8 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.