#309EF3
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.9% 0.158 246.9), rgb(48, 158, 243).
Aa
Black text reads best on this color (7.31:1).
About this color
#309EF3 is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.158 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.025 away. Black text reads best on it, at 7.31:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.31:1 |
| White text | 2.87:1 |
Values
| HEX | #309EF3 |
| RGB | rgb(48, 158, 243) |
| HSL | hsl(206, 89%, 57%) |
| OKLCH | oklch(67.9% 0.158 246.9) |
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 #309EF3 | 2.87:1 | Fails | Lc -59.8 | Large or bold text, headings |
| Black text on #309EF3 | 7.31:1 | AAA | Lc 49.6 | Large or bold text, headings |
| #309EF3 text on white | 2.87:1 | Fails | Lc 54.5 | Large or bold text, headings |
| #309EF3 text on black | 7.31:1 | AAA | Lc -47.4 | Large or bold text, headings |
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 400.
-
Step 50
50
#EFF7FE
oklch(97.2% 0.013 244.3)
-
Step 100
100
#DBECFC
oklch(93.5% 0.028 246.5)
-
Step 200
200
#BDDDFC
oklch(88.4% 0.055 247.6)
-
Step 300
300
#8BC7FD
oklch(80.9% 0.099 246.5)
-
Step 400
400 (this color)
#309EF3
oklch(67.9% 0.158 246.9)
-
Step 500
500
#008FE7
oklch(63.2% 0.166 246.8)
-
Step 600
600
#0078C3
oklch(55.7% 0.146 246.8)
-
Step 700
700
#0064A5
oklch(49% 0.13 247.2)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#004473
oklch(37.7% 0.1 247.4)
-
Step 950
950
#002847
oklch(27% 0.072 247.4)
#309EF3 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) | #76A2F7 | 0.060 |
| Deuteranopia (no green cones) | #5990F1 | 0.042 |
| Tritanopia (no blue cones) | #00B3BD | 0.114 |
| Achromatopsia (no color) | #989898 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #309EF3
#309EF3
oklch(67.9% 0.158 246.9)
- #D48200
#D48200
oklch(67.8% 0.15 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 #309EF3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.025
- Cornflower Blue #6495ED ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.044
- Dodger Blue #1E90FF ΔE 0.046
- Soft Blue #6488EA ΔE 0.064
- Water Blue #0E87CC ΔE 0.083
- Deep Sky Blue #00BFFF ΔE 0.087
- Periwinkle Blue #8F99FB ΔE 0.090
Use #309EF3 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.