#306BD4
Closest named color: Royal Blue (#4169E1). oklch(54.8% 0.173 260.9), rgb(48, 107, 212).
Aa
White text reads best on this color (5.02:1).
About this color
#306BD4 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.173 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.026 away. White text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.17:1 |
| White text | 5.02:1 |
Values
| HEX | #306BD4 |
| RGB | rgb(48, 107, 212) |
| HSL | hsl(218, 66%, 51%) |
| OKLCH | oklch(54.8% 0.173 260.9) |
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 #306BD4 | 5.02:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #306BD4 | 4.17:1 | AA large text | Lc 29.8 | Dividers and decoration only |
| #306BD4 text on white | 5.02:1 | AA | Lc 74.3 | Content text, not long reading |
| #306BD4 text on black | 4.17:1 | AA large text | Lc -27.4 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAF9
oklch(93.5% 0.023 260.7)
-
Step 200
200
#C9DAF7
oklch(88.5% 0.044 261.2)
-
Step 300
300
#A4C2F4
oklch(81% 0.078 260.5)
-
Step 400
400
#73A0EE
oklch(70.6% 0.125 260.9)
-
Step 500
500
#4F86E9
oklch(63.1% 0.16 261.2)
-
Step 600
600 (this color)
#306BD4
oklch(54.8% 0.173 260.9)
-
Step 700
700
#255BBA
oklch(49.1% 0.161 260.8)
-
Step 800
800
#204B97
oklch(42.8% 0.134 260.8)
-
Step 900
900
#1F3F78
oklch(37.6% 0.105 261)
-
Step 950
950
#132546
oklch(26.9% 0.066 261.5)
#306BD4 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) | #2B77D8 | 0.031 |
| Deuteranopia (no green cones) | #0068D2 | 0.024 |
| Tritanopia (no blue cones) | #008495 | 0.135 |
| Achromatopsia (no color) | #6F6F6F | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #306BD4
#306BD4
oklch(54.8% 0.173 260.9)
- #926800
#926800
oklch(54.6% 0.113 80.7)
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 #306BD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.026
- Cerulean Blue #056EEE ΔE 0.042
- Neon Blue #4361EE ΔE 0.050
- Windows Blue #3778BF ΔE 0.052
- Warm Blue #4B57DB ΔE 0.052
- Mid Blue #276AB3 ΔE 0.053
- Azul #1D5DEC ΔE 0.054
- French Blue #436BAD ΔE 0.062
Use #306BD4 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.