#307ADD
Closest named color: Royal Blue (#4169E1). oklch(58.6% 0.168 257), rgb(48, 122, 221).
Aa
Black text reads best on this color (4.95:1).
About this color
#307ADD is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.168 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.044 away. Black text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.95:1 |
| White text | 4.23:1 |
Values
| HEX | #307ADD |
| RGB | rgb(48, 122, 221) |
| HSL | hsl(214, 72%, 53%) |
| OKLCH | oklch(58.6% 0.168 257) |
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 #307ADD | 4.23:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #307ADD | 4.95:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #307ADD text on white | 4.23:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #307ADD text on black | 4.95:1 | AA | Lc -32.8 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A2C3F2
oklch(81% 0.076 257.2)
-
Step 400
400
#6EA2EB
oklch(70.6% 0.121 257)
-
Step 500
500
#4689E5
oklch(63.1% 0.155 257)
-
Step 600
600 (this color)
#307ADD
oklch(58.6% 0.168 257)
-
Step 700
700
#185EB7
oklch(49.2% 0.156 257)
-
Step 800
800
#174D94
oklch(42.7% 0.13 257.1)
-
Step 900
900
#1A4176
oklch(37.8% 0.101 257)
-
Step 950
950
#102645
oklch(26.9% 0.064 257.3)
#307ADD 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) | #4683E1 | 0.032 |
| Deuteranopia (no green cones) | #1F74DB | 0.020 |
| Tritanopia (no blue cones) | #0092A1 | 0.129 |
| Achromatopsia (no color) | #7B7B7B | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #307ADD
#307ADD
oklch(58.6% 0.168 257)
- #A47100
#A47100
oklch(58.6% 0.123 77.4)
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 #307ADD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.044
- Windows Blue #3778BF ΔE 0.046
- Cerulean Blue #056EEE ΔE 0.047
- Clear Blue #247AFD ΔE 0.048
- Water Blue #0E87CC ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.058
- Soft Blue #6488EA ΔE 0.068
- Neon Blue #4361EE ΔE 0.068
Use #307ADD 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.