#307CFB
Closest named color: Clear Blue (#247AFD). oklch(61.1% 0.204 260.2), rgb(48, 124, 251).
Aa
Black text reads best on this color (5.40:1).
About this color
#307CFB is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.204 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.010 away. Black text reads best on it, at 5.40:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.204) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.40:1 |
| White text | 3.88:1 |
Values
| HEX | #307CFB |
| RGB | rgb(48, 124, 251) |
| HSL | hsl(218, 96%, 59%) |
| OKLCH | oklch(61.1% 0.204 260.2) |
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 #307CFB | 3.88:1 | AA large text | Lc -71.2 | Content text, not long reading |
| Black text on #307CFB | 5.40:1 | AA | Lc 38.3 | Non-text elements, placeholder text |
| #307CFB text on white | 3.88:1 | AA large text | Lc 65.7 | Content text, not long reading |
| #307CFB text on black | 5.40:1 | AA | Lc -35.9 | 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 500.
-
Step 50
50
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFE
oklch(93.7% 0.029 259.6)
-
Step 200
200
#C4DAFF
oklch(88.4% 0.057 260.8)
-
Step 300
300
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400
#669FFF
oklch(70.7% 0.154 260.3)
-
Step 500
500 (this color)
#307CFB
oklch(61.1% 0.204 260.2)
-
Step 600
600
#0C68F2
oklch(55.7% 0.222 260.2)
-
Step 700
700
#0055D1
oklch(49.1% 0.204 260.3)
-
Step 800
800
#0546AA
oklch(42.6% 0.171 260.3)
-
Step 900
900
#103D87
oklch(37.8% 0.133 260.2)
-
Step 950
950
#0B244F
oklch(27% 0.085 260.5)
#307CFB 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) | #268BFF | 0.037 |
| Deuteranopia (no green cones) | #0079F8 | 0.021 |
| Tritanopia (no blue cones) | #009BB0 | 0.157 |
| Achromatopsia (no color) | #818181 | 0.204 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #307CFB
#307CFB
oklch(61.1% 0.204 260.2)
- #AB7900
#AB7900
oklch(61.1% 0.127 79.7)
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 #307CFB, closest first.
No curated palette has a color within ΔE 0.04 of #307CFB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.010
- Cerulean Blue #056EEE ΔE 0.046
- Dodger Blue #1E90FF ΔE 0.050
- Cornflower #6A79F7 ΔE 0.055
- Royal Blue #4169E1 ΔE 0.058
- Bright Blue #0165FC ΔE 0.062
- Neon Blue #4361EE ΔE 0.065
- Dark Sky Blue #448EE4 ΔE 0.065
Use #307CFB 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.