#309CEC
Closest named color: Chefchaouen Blue (#4895EF). oklch(67% 0.152 245.8), rgb(48, 156, 236).
Aa
Black text reads best on this color (7.09:1).
About this color
#309CEC is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.152 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.023 away. Black text reads best on it, at 7.09:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.09:1 |
| White text | 2.96:1 |
Values
| HEX | #309CEC |
| RGB | rgb(48, 156, 236) |
| HSL | hsl(206, 83%, 56%) |
| OKLCH | oklch(67% 0.152 245.8) |
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 #309CEC | 2.96:1 | Fails | Lc -61.0 | Content text, not long reading |
| Black text on #309CEC | 7.09:1 | AAA | Lc 48.3 | Large or bold text, headings |
| #309CEC text on white | 2.96:1 | Fails | Lc 55.7 | Large or bold text, headings |
| #309CEC text on black | 7.09:1 | AAA | Lc -46.1 | 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
#DCECFC
oklch(93.6% 0.028 248.1)
-
Step 200
200
#BDDDFB
oklch(88.4% 0.054 246.7)
-
Step 300
300
#8DC7FA
oklch(80.9% 0.094 245.8)
-
Step 400
400 (this color)
#309CEC
oklch(67% 0.152 245.8)
-
Step 500
500
#008FE4
oklch(63% 0.162 246)
-
Step 600
600
#0078C0
oklch(55.5% 0.142 245.8)
-
Step 700
700
#0065A3
oklch(49.1% 0.126 245.9)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950
#002846
oklch(26.9% 0.07 246.6)
#309CEC 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) | #769FEF | 0.060 |
| Deuteranopia (no green cones) | #5B8EEA | 0.044 |
| Tritanopia (no blue cones) | #00AFB9 | 0.106 |
| Achromatopsia (no color) | #969696 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #309CEC
#309CEC
oklch(67% 0.152 245.8)
- #D27F00
#D27F00
oklch(67% 0.15 65.7)
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 #309CEC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.023
- Dark Sky Blue #448EE4 ΔE 0.037
- Cornflower Blue #6495ED ΔE 0.041
- Dodger Blue #1E90FF ΔE 0.048
- Soft Blue #6488EA ΔE 0.061
- Water Blue #0E87CC ΔE 0.073
- Faded Blue #658CBB ΔE 0.081
- Cool Blue #4984B8 ΔE 0.090
Use #309CEC 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.