#306BBD
Closest named color: Mid Blue (#276AB3). oklch(53.2% 0.143 257.4), rgb(48, 107, 189).
Aa
White text reads best on this color (5.29:1).
About this color
#306BBD is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.143 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.018 away. White text reads best on it, at 5.29:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.96:1 |
| White text | 5.29:1 |
Values
| HEX | #306BBD |
| RGB | rgb(48, 107, 189) |
| HSL | hsl(215, 59%, 46%) |
| OKLCH | oklch(53.2% 0.143 257.4) |
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 #306BBD | 5.29:1 | AA | Lc -81.3 | Fine for body text |
| Black text on #306BBD | 3.96:1 | AA large text | Lc 28.1 | Dividers and decoration only |
| #306BBD text on white | 5.29:1 | AA | Lc 76.0 | Fine for body text |
| #306BBD text on black | 3.96:1 | AA large text | Lc -25.8 | 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
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CBDAF1
oklch(88.4% 0.036 258.9)
-
Step 300
300
#A7C3EA
oklch(81% 0.063 256.7)
-
Step 400
400
#77A2E0
oklch(70.6% 0.103 257.5)
-
Step 500
500
#538AD8
oklch(63.1% 0.132 257.3)
-
Step 600
600 (this color)
#306BBD
oklch(53.2% 0.143 257.4)
-
Step 700
700
#2A5FAA
oklch(49% 0.133 257.6)
-
Step 800
800
#244E8A
oklch(42.7% 0.11 257.7)
-
Step 900
900
#22426E
oklch(37.8% 0.085 256.8)
-
Step 950
950
#142741
oklch(27.1% 0.055 256.6)
#306BBD 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) | #4272C0 | 0.027 |
| Deuteranopia (no green cones) | #2865BB | 0.019 |
| Tritanopia (no blue cones) | #007E8B | 0.110 |
| Achromatopsia (no color) | #6B6B6B | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #306BBD
#306BBD
oklch(53.2% 0.143 257.4)
- #906200
#906200
oklch(53.2% 0.111 76.7)
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 #306BBD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.018
- French Blue #436BAD ΔE 0.029
- Windows Blue #3778BF ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.045
- Nice Blue #107AB0 ΔE 0.051
- Muted Blue #3B719F ΔE 0.055
- Royal Blue #4169E1 ΔE 0.059
- Ocean Blue #03719C ΔE 0.063
Use #306BBD 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.