#307BAE
Closest named color: Nice Blue (#107AB0). oklch(56% 0.108 242.2), rgb(48, 123, 174).
Aa
White text reads best on this color (4.59:1).
About this color
#307BAE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.108 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.016 away. White text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.57:1 |
| White text | 4.59:1 |
Values
| HEX | #307BAE |
| RGB | rgb(48, 123, 174) |
| HSL | hsl(204, 57%, 44%) |
| OKLCH | oklch(56% 0.108 242.2) |
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 #307BAE | 4.59:1 | AA | Lc -77.1 | Fine for body text |
| Black text on #307BAE | 4.57:1 | AA | Lc 32.5 | Non-text elements, placeholder text |
| #307BAE text on white | 4.59:1 | AA | Lc 71.6 | Content text, not long reading |
| #307BAE text on black | 4.57:1 | AA | Lc -30.1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A6C5DE
oklch(80.9% 0.049 242.6)
-
Step 400
400
#75A7CD
oklch(70.7% 0.077 241.9)
-
Step 500
500
#4E90C0
oklch(63% 0.099 242.2)
-
Step 600
600 (this color)
#307BAE
oklch(56% 0.108 242.2)
-
Step 700
700
#206694
oklch(49% 0.1 242.2)
-
Step 800
800
#1D5478
oklch(42.8% 0.082 241.4)
-
Step 900
900
#1F4561
oklch(37.6% 0.065 243)
-
Step 950
950
#132939
oklch(27.1% 0.041 242)
#307BAE 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) | #647CB0 | 0.053 |
| Deuteranopia (no green cones) | #5270AD | 0.041 |
| Tritanopia (no blue cones) | #00888D | 0.076 |
| Achromatopsia (no color) | #757575 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #307BAE
#307BAE
oklch(56% 0.108 242.2)
- #A16428
#A16428
oklch(55.9% 0.108 61.6)
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 #307BAE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.016
- Flat Blue #3C73A8 ΔE 0.023
- Steel Blue #4682B4 ΔE 0.030
- Cerulean #457B9D ΔE 0.030
- Windows Blue #3778BF ΔE 0.031
- Muted Blue #3B719F ΔE 0.032
- Dull Blue #49759C ΔE 0.033
- Cool Blue #4984B8 ΔE 0.038
Use #307BAE 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.