#309BEA
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.7% 0.15 245.7), rgb(48, 155, 234).
Aa
Black text reads best on this color (7.00:1).
About this color
#309BEA is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.150 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 7.00:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.00:1 |
| White text | 2.99:1 |
Values
| HEX | #309BEA |
| RGB | rgb(48, 155, 234) |
| HSL | hsl(205, 82%, 55%) |
| OKLCH | oklch(66.7% 0.15 245.7) |
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 #309BEA | 2.99:1 | Fails | Lc -61.6 | Content text, not long reading |
| Black text on #309BEA | 7.00:1 | AAA | Lc 47.8 | Large or bold text, headings |
| #309BEA text on white | 2.99:1 | Fails | Lc 56.2 | Large or bold text, headings |
| #309BEA text on black | 7.00:1 | AAA | Lc -45.6 | 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 500.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C4DDF3
oklch(88.6% 0.04 244.8)
-
Step 300
300
#99C6EE
oklch(80.9% 0.074 245.7)
-
Step 400
400
#5DA7E5
oklch(70.6% 0.118 245.8)
-
Step 500
500 (this color)
#309BEA
oklch(66.7% 0.15 245.7)
-
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
#052943
oklch(27.1% 0.062 245.1)
#309BEA 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) | #769EED | 0.061 |
| Deuteranopia (no green cones) | #5B8DE9 | 0.044 |
| Tritanopia (no blue cones) | #00AEB8 | 0.105 |
| Achromatopsia (no color) | #959595 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #309BEA
#309BEA
oklch(66.7% 0.15 245.7)
- #D17E00
#D17E00
oklch(66.7% 0.149 65.5)
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 #309BEA, 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 0.034
- Cornflower Blue #6495ED ΔE 0.041
- Dodger Blue #1E90FF ΔE 0.048
- Soft Blue #6488EA ΔE 0.060
- Water Blue #0E87CC ΔE 0.070
- Faded Blue #658CBB ΔE 0.078
- Cool Blue #4984B8 ΔE 0.087
Use #309BEA 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.