#306E9B
Closest named color: Muted Blue (#3B719F). oklch(51.8% 0.096 243.2), rgb(48, 110, 155).
Aa
White text reads best on this color (5.48:1).
About this color
#306E9B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.096 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.015 away. White text reads best on it, at 5.48:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 3.82:1 |
| White text | 5.48:1 |
Values
| HEX | #306E9B |
| RGB | rgb(48, 110, 155) |
| HSL | hsl(205, 53%, 40%) |
| OKLCH | oklch(51.8% 0.096 243.2) |
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 #306E9B | 5.48:1 | AA | Lc -82.4 | Fine for body text |
| Black text on #306E9B | 3.82:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #306E9B text on white | 5.48:1 | AA | Lc 77.1 | Fine for body text |
| #306E9B text on black | 3.82:1 | AA large text | Lc -24.6 | 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
#A8C5DD
oklch(81% 0.046 243.3)
-
Step 400
400
#78A6CC
oklch(70.6% 0.075 244)
-
Step 500
500
#5390BE
oklch(63.1% 0.094 242.8)
-
Step 600
600
#3579AB
oklch(55.5% 0.104 243.6)
-
Step 700
700 (this color)
#306E9B
oklch(51.8% 0.096 243.2)
-
Step 800
800
#225377
oklch(42.6% 0.08 243.6)
-
Step 900
900
#224560
oklch(37.7% 0.062 243.8)
-
Step 950
950
#142938
oklch(27.1% 0.039 241.3)
#306E9B 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) | #5A6F9D | 0.046 |
| Deuteranopia (no green cones) | #4B649A | 0.036 |
| Tritanopia (no blue cones) | #00797E | 0.069 |
| Achromatopsia (no color) | #696969 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #306E9B
#306E9B
oklch(51.8% 0.096 243.2)
- #8F5B26
#8F5B26
oklch(51.9% 0.096 63.1)
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 #306E9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.015
- Ocean Blue #03719C ΔE 0.020
- Flat Blue #3C73A8 ΔE 0.027
- Sea Blue #047495 ΔE 0.029
- Dull Blue #49759C ΔE 0.034
- Peacock Blue #016795 ΔE 0.034
- Denim #3B638C ΔE 0.035
- French Blue #436BAD ΔE 0.037
Use #306E9B 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.