#306BEF
Closest named color: Cerulean Blue (#056EEE). oklch(56.8% 0.209 263.2), rgb(48, 107, 239).
Aa
White text reads best on this color (4.69:1).
About this color
#306BEF is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.209 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.018 away. White text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.209) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.47:1 |
| White text | 4.69:1 |
Values
| HEX | #306BEF |
| RGB | rgb(48, 107, 239) |
| HSL | hsl(221, 86%, 56%) |
| OKLCH | oklch(56.8% 0.209 263.2) |
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 #306BEF | 4.69:1 | AA | Lc -77.4 | Fine for body text |
| Black text on #306BEF | 4.47:1 | AA large text | Lc 32.1 | Non-text elements, placeholder text |
| #306BEF text on white | 4.69:1 | AA | Lc 72.0 | Content text, not long reading |
| #306BEF text on black | 4.47:1 | AA large text | Lc -29.7 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C7DAFD
oklch(88.5% 0.053 262.7)
-
Step 300
300
#A1C1FE
oklch(81% 0.094 263)
-
Step 400
400
#6E9EFE
oklch(70.8% 0.15 263)
-
Step 500
500
#4982FC
oklch(63.2% 0.192 263.2)
-
Step 600
600 (this color)
#306BEF
oklch(56.8% 0.209 263.2)
-
Step 700
700
#2055CC
oklch(49.2% 0.193 263.1)
-
Step 800
800
#1C46A5
oklch(42.7% 0.161 263.2)
-
Step 900
900
#1C3C83
oklch(37.7% 0.126 263.3)
-
Step 950
950
#11244D
oklch(27.1% 0.08 263.3)
#306BEF 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) | #007DF4 | 0.044 |
| Deuteranopia (no green cones) | #006BEC | 0.020 |
| Tritanopia (no blue cones) | #008CA3 | 0.161 |
| Achromatopsia (no color) | #747474 | 0.209 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #306BEF
#306BEF
oklch(56.8% 0.209 263.2)
- #986F00
#986F00
oklch(56.8% 0.117 82.9)
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 #306BEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.018
- Royal Blue #4169E1 ΔE 0.025
- Neon Blue #4361EE ΔE 0.025
- Bright Blue #0165FC ΔE 0.032
- Azul #1D5DEC ΔE 0.038
- Clear Blue #247AFD ΔE 0.040
- Warm Blue #4B57DB ΔE 0.056
- Electric Blue #0652FF ΔE 0.067
Use #306BEF 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.