#306DB8
Closest named color: Mid Blue (#276AB3). oklch(53.3% 0.134 255.2), rgb(48, 109, 184).
Aa
White text reads best on this color (5.24:1).
About this color
#306DB8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.134 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.014 away. White text reads best on it, at 5.24:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.00:1 |
| White text | 5.24:1 |
Values
| HEX | #306DB8 |
| RGB | rgb(48, 109, 184) |
| HSL | hsl(213, 59%, 45%) |
| OKLCH | oklch(53.3% 0.134 255.2) |
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 #306DB8 | 5.24:1 | AA | Lc -81.1 | Fine for body text |
| Black text on #306DB8 | 4.00:1 | AA large text | Lc 28.4 | Dividers and decoration only |
| #306DB8 text on white | 5.24:1 | AA | Lc 75.7 | Fine for body text |
| #306DB8 text on black | 4.00:1 | AA large text | Lc -26.0 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBEF
oklch(88.6% 0.033 254)
-
Step 300
300
#A7C3E8
oklch(80.9% 0.061 255.5)
-
Step 400
400
#77A3DC
oklch(70.6% 0.097 255.2)
-
Step 500
500
#538BD2
oklch(63% 0.123 255.1)
-
Step 600
600 (this color)
#306DB8
oklch(53.3% 0.134 255.2)
-
Step 700
700
#2961A5
oklch(49.1% 0.124 255.1)
-
Step 800
800
#234F86
oklch(42.6% 0.104 255.4)
-
Step 900
900
#22426B
oklch(37.6% 0.08 255.5)
-
Step 950
950
#15273F
oklch(27% 0.051 256.1)
#306DB8 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) | #4973BB | 0.031 |
| Deuteranopia (no green cones) | #3366B6 | 0.019 |
| Tritanopia (no blue cones) | #007F89 | 0.104 |
| Achromatopsia (no color) | #6C6C6C | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #306DB8
#306DB8
oklch(53.3% 0.134 255.2)
- #926200
#926200
oklch(53.4% 0.112 75.5)
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 #306DB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.014
- French Blue #436BAD ΔE 0.023
- Windows Blue #3778BF ΔE 0.033
- Flat Blue #3C73A8 ΔE 0.035
- Nice Blue #107AB0 ΔE 0.042
- Muted Blue #3B719F ΔE 0.044
- Ocean Blue #03719C ΔE 0.054
- Dull Blue #49759C ΔE 0.059
Use #306DB8 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.