#306BCF
Closest named color: Royal Blue (#4169E1). oklch(54.4% 0.167 260.3), rgb(48, 107, 207).
Aa
White text reads best on this color (5.08:1).
About this color
#306BCF is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.167 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.033 away. White text reads best on it, at 5.08:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.12:1 |
| White text | 5.08:1 |
Values
| HEX | #306BCF |
| RGB | rgb(48, 107, 207) |
| HSL | hsl(218, 62%, 50%) |
| OKLCH | oklch(54.4% 0.167 260.3) |
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 #306BCF | 5.08:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #306BCF | 4.12:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #306BCF text on white | 5.08:1 | AA | Lc 74.6 | Content text, not long reading |
| #306BCF text on black | 4.12:1 | AA large text | Lc -27.1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A5C2F2
oklch(80.9% 0.075 260.4)
-
Step 400
400
#74A1EB
oklch(70.7% 0.12 260)
-
Step 500
500
#5087E5
oklch(63.1% 0.154 260.4)
-
Step 600
600 (this color)
#306BCF
oklch(54.4% 0.167 260.3)
-
Step 700
700
#265CB7
oklch(49.1% 0.155 260.2)
-
Step 800
800
#214C94
oklch(42.8% 0.128 260.1)
-
Step 900
900
#204076
oklch(37.8% 0.1 260.2)
-
Step 950
950
#132645
oklch(27.1% 0.063 259.7)
#306BCF 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) | #3276D3 | 0.030 |
| Deuteranopia (no green cones) | #0067CD | 0.026 |
| Tritanopia (no blue cones) | #008393 | 0.130 |
| Achromatopsia (no color) | #6E6E6E | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #306BCF
#306BCF
oklch(54.4% 0.167 260.3)
- #926700
#926700
oklch(54.4% 0.113 79.9)
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 #306BCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.033
- Mid Blue #276AB3 ΔE 0.045
- Windows Blue #3778BF ΔE 0.047
- Cerulean Blue #056EEE ΔE 0.049
- French Blue #436BAD ΔE 0.055
- Warm Blue #4B57DB ΔE 0.056
- Neon Blue #4361EE ΔE 0.057
- Azul #1D5DEC ΔE 0.060
Use #306BCF 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.