#337AE7
Closest named color: Clear Blue (#247AFD). oklch(59.4% 0.18 259), rgb(51, 122, 231).
Aa
Black text reads best on this color (5.07:1).
About this color
#337AE7 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.180 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.034 away. Black text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.07:1 |
| White text | 4.13:1 |
Values
| HEX | #337AE7 |
| RGB | rgb(51, 122, 231) |
| HSL | hsl(216, 79%, 55%) |
| OKLCH | oklch(59.4% 0.18 259) |
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 #337AE7 | 4.13:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #337AE7 | 5.07:1 | AA | Lc 36.1 | Non-text elements, placeholder text |
| #337AE7 text on white | 4.13:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #337AE7 text on black | 5.07:1 | AA | Lc -33.7 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9FC2FA
oklch(80.9% 0.088 259.7)
-
Step 400
400
#69A1F7
oklch(70.8% 0.14 258.7)
-
Step 500
500 (this color)
#337AE7
oklch(59.4% 0.18 259)
-
Step 600
600
#1B6CE3
oklch(55.6% 0.196 259.1)
-
Step 700
700
#0C5AC5
oklch(49.2% 0.181 258.9)
-
Step 800
800
#0F4A9F
oklch(42.7% 0.15 258.9)
-
Step 900
900
#153F7E
oklch(37.7% 0.117 258.8)
-
Step 950
950
#0E254A
oklch(26.9% 0.075 259.5)
#337AE7 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) | #3D85EB | 0.031 |
| Deuteranopia (no green cones) | #0075E5 | 0.026 |
| Tritanopia (no blue cones) | #0094A5 | 0.139 |
| Achromatopsia (no color) | #7D7D7D | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #337AE7
#337AE7
oklch(59.4% 0.18 259)
- #A57400
#A57400
oklch(59.4% 0.123 79.2)
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 #337AE7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.034
- Cerulean Blue #056EEE ΔE 0.041
- Royal Blue #4169E1 ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.058
- Water Blue #0E87CC ΔE 0.060
- Windows Blue #3778BF ΔE 0.061
- Cornflower #6A79F7 ΔE 0.061
- Neon Blue #4361EE ΔE 0.061
Use #337AE7 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.