#306FBB
Closest named color: Mid Blue (#276AB3). oklch(54% 0.136 254.9), rgb(48, 111, 187).
Aa
White text reads best on this color (5.10:1).
About this color
#306FBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.136 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.020 away. White text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.11:1 |
| White text | 5.10:1 |
Values
| HEX | #306FBB |
| RGB | rgb(48, 111, 187) |
| HSL | hsl(213, 59%, 46%) |
| OKLCH | oklch(54% 0.136 254.9) |
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 #306FBB | 5.10:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #306FBB | 4.11:1 | AA large text | Lc 29.2 | Dividers and decoration only |
| #306FBB text on white | 5.10:1 | AA | Lc 74.8 | Content text, not long reading |
| #306FBB text on black | 4.11:1 | AA large text | Lc -26.9 | 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
#CBDBF0
oklch(88.6% 0.034 255.2)
-
Step 300
300
#A7C3E8
oklch(80.9% 0.061 255.5)
-
Step 400
400
#76A3DD
oklch(70.6% 0.099 255.1)
-
Step 500
500
#528BD3
oklch(63% 0.125 255.1)
-
Step 600
600 (this color)
#306FBB
oklch(54% 0.136 254.9)
-
Step 700
700
#2761A6
oklch(49.1% 0.126 254.8)
-
Step 800
800
#224F87
oklch(42.6% 0.106 255.4)
-
Step 900
900
#21426C
oklch(37.6% 0.082 255.4)
-
Step 950
950
#14273F
oklch(27% 0.052 255)
#306FBB 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) | #4B75BE | 0.032 |
| Deuteranopia (no green cones) | #3468B9 | 0.019 |
| Tritanopia (no blue cones) | #00818C | 0.104 |
| Achromatopsia (no color) | #6E6E6E | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #306FBB
#306FBB
oklch(54% 0.136 254.9)
- #956300
#956300
oklch(54% 0.114 74.6)
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 #306FBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.020
- French Blue #436BAD ΔE 0.026
- Windows Blue #3778BF ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.036
- Nice Blue #107AB0 ΔE 0.040
- Muted Blue #3B719F ΔE 0.046
- Ocean Blue #03719C ΔE 0.057
- Dull Blue #49759C ΔE 0.060
Use #306FBB 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.