#307ABC
Closest named color: Windows Blue (#3778BF). oklch(56.5% 0.125 248.9), rgb(48, 122, 188).
Aa
Black text reads best on this color (4.63:1).
About this color
#307ABC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.125 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.009 away. Black text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.63:1 |
| White text | 4.53:1 |
Values
| HEX | #307ABC |
| RGB | rgb(48, 122, 188) |
| HSL | hsl(208, 59%, 46%) |
| OKLCH | oklch(56.5% 0.125 248.9) |
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 #307ABC | 4.53:1 | AA | Lc -76.6 | Fine for body text |
| Black text on #307ABC | 4.63:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #307ABC text on white | 4.53:1 | AA | Lc 71.1 | Content text, not long reading |
| #307ABC text on black | 4.63:1 | AA | Lc -30.6 | Non-text elements, placeholder text |
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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBED
oklch(88.4% 0.031 249.7)
-
Step 300
300
#A5C4E4
oklch(80.8% 0.056 249.4)
-
Step 400
400
#73A5D7
oklch(70.6% 0.091 249.2)
-
Step 500
500
#4D8ECC
oklch(63.1% 0.115 249.1)
-
Step 600
600 (this color)
#307ABC
oklch(56.5% 0.125 248.9)
-
Step 700
700
#1F649F
oklch(49.1% 0.116 248.8)
-
Step 800
800
#1C5281
oklch(42.8% 0.096 248.6)
-
Step 900
900
#1E4468
oklch(37.7% 0.076 249.4)
-
Step 950
950
#12283D
oklch(27% 0.048 249)
#307ABC 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) | #5C7DBF | 0.044 |
| Deuteranopia (no green cones) | #4770BB | 0.031 |
| Tritanopia (no blue cones) | #008A92 | 0.093 |
| Achromatopsia (no color) | #767676 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #307ABC
#307ABC
oklch(56.5% 0.125 248.9)
- #A46600
#A46600
oklch(56.5% 0.123 68.8)
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 #307ABC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.009
- Nice Blue #107AB0 ΔE 0.026
- Flat Blue #3C73A8 ΔE 0.033
- Steel Blue #4682B4 ΔE 0.035
- Water Blue #0E87CC ΔE 0.039
- Cool Blue #4984B8 ΔE 0.039
- French Blue #436BAD ΔE 0.044
- Muted Blue #3B719F ΔE 0.047
Use #307ABC 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.