#307AB7
Closest named color: Windows Blue (#3778BF). oklch(56.3% 0.119 247), rgb(48, 122, 183).
Aa
Black text reads best on this color (4.59:1).
About this color
#307AB7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.119 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.016 away. Black text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.59:1 |
| White text | 4.57:1 |
Values
| HEX | #307AB7 |
| RGB | rgb(48, 122, 183) |
| HSL | hsl(207, 58%, 45%) |
| OKLCH | oklch(56.3% 0.119 247) |
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 #307AB7 | 4.57:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #307AB7 | 4.59:1 | AA | Lc 32.6 | Non-text elements, placeholder text |
| #307AB7 text on white | 4.57:1 | AA | Lc 71.4 | Content text, not long reading |
| #307AB7 text on black | 4.59:1 | AA | Lc -30.2 | 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
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADCEC
oklch(88.6% 0.029 244.9)
-
Step 300
300
#A5C5E2
oklch(81% 0.054 245.9)
-
Step 400
400
#74A6D4
oklch(70.8% 0.086 247.1)
-
Step 500
500
#4D8FC8
oklch(63.1% 0.11 246.7)
-
Step 600
600 (this color)
#307AB7
oklch(56.3% 0.119 247)
-
Step 700
700
#20659C
oklch(49.2% 0.111 247)
-
Step 800
800
#1D527E
oklch(42.6% 0.092 247.3)
-
Step 900
900
#1E4465
oklch(37.6% 0.071 247.3)
-
Step 950
950
#13283B
oklch(26.9% 0.045 247.5)
#307AB7 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) | #5E7DBA | 0.047 |
| Deuteranopia (no green cones) | #4B70B6 | 0.033 |
| Tritanopia (no blue cones) | #008990 | 0.088 |
| Achromatopsia (no color) | #767676 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #307AB7
#307AB7
oklch(56.3% 0.119 247)
- #A36510
#A36510
oklch(56.2% 0.119 66.8)
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 #307AB7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.016
- Nice Blue #107AB0 ΔE 0.020
- Flat Blue #3C73A8 ΔE 0.027
- Steel Blue #4682B4 ΔE 0.032
- Cool Blue #4984B8 ΔE 0.038
- Muted Blue #3B719F ΔE 0.040
- French Blue #436BAD ΔE 0.042
- Water Blue #0E87CC ΔE 0.043
Use #307AB7 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.