#306D99
Closest named color: Muted Blue (#3B719F). oklch(51.5% 0.094 243), rgb(48, 109, 153).
Aa
White text reads best on this color (5.56:1).
About this color
#306D99 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.094 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.018 away. White text reads best on it, at 5.56:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 3.77:1 |
| White text | 5.56:1 |
Values
| HEX | #306D99 |
| RGB | rgb(48, 109, 153) |
| HSL | hsl(205, 52%, 39%) |
| OKLCH | oklch(51.5% 0.094 243) |
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 #306D99 | 5.56:1 | AA | Lc -82.9 | Fine for body text |
| Black text on #306D99 | 3.77:1 | AA large text | Lc 26.5 | Dividers and decoration only |
| #306D99 text on white | 5.56:1 | AA | Lc 77.6 | Fine for body text |
| #306D99 text on black | 3.77:1 | AA large text | Lc -24.2 | 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 700.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CBDCE9
oklch(88.6% 0.026 240.7)
-
Step 300
300
#A8C5DC
oklch(80.9% 0.045 242.1)
-
Step 400
400
#79A6CB
oklch(70.7% 0.073 243.9)
-
Step 500
500
#5490BD
oklch(63.1% 0.093 242.6)
-
Step 600
600
#3779AA
oklch(55.6% 0.102 243.6)
-
Step 700
700 (this color)
#306D99
oklch(51.5% 0.094 243)
-
Step 800
800
#235376
oklch(42.6% 0.078 243.2)
-
Step 900
900
#22455F
oklch(37.7% 0.06 242.8)
-
Step 950
950
#152938
oklch(27.2% 0.038 242.4)
#306D99 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) | #596E9B | 0.045 |
| Deuteranopia (no green cones) | #4B6498 | 0.035 |
| Tritanopia (no blue cones) | #00787C | 0.069 |
| Achromatopsia (no color) | #686868 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #306D99
#306D99
oklch(51.5% 0.094 243)
- #8D5A27
#8D5A27
oklch(51.4% 0.094 62.8)
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 #306D99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.018
- Ocean Blue #03719C ΔE 0.021
- Sea Blue #047495 ΔE 0.029
- Flat Blue #3C73A8 ΔE 0.030
- Denim #3B638C ΔE 0.032
- Peacock Blue #016795 ΔE 0.032
- Dull Blue #49759C ΔE 0.036
- French Blue #436BAD ΔE 0.039
Use #306D99 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.