#309AFA
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.4% 0.17 250.4), rgb(48, 154, 250).
Aa
Black text reads best on this color (7.12:1).
About this color
#309AFA is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.170 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.022 away. Black text reads best on it, at 7.12:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.12:1 |
| White text | 2.94:1 |
Values
| HEX | #309AFA |
| RGB | rgb(48, 154, 250) |
| HSL | hsl(209, 95%, 58%) |
| OKLCH | oklch(67.4% 0.17 250.4) |
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 #309AFA | 2.94:1 | Fails | Lc -60.8 | Content text, not long reading |
| Black text on #309AFA | 7.12:1 | AAA | Lc 48.6 | Large or bold text, headings |
| #309AFA text on white | 2.94:1 | Fails | Lc 55.5 | Large or bold text, headings |
| #309AFA text on black | 7.12:1 | AAA | Lc -46.3 | 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
#EFF6FF
oklch(97% 0.014 254.6)
-
Step 100
100
#DBECFE
oklch(93.6% 0.03 249.7)
-
Step 200
200
#BDDDFF
oklch(88.5% 0.058 250.1)
-
Step 300
300
#8FC6FF
oklch(81% 0.099 250)
-
Step 400
400 (this color)
#309AFA
oklch(67.4% 0.17 250.4)
-
Step 500
500
#008CF1
oklch(63.1% 0.18 250.4)
-
Step 600
600
#0075CC
oklch(55.6% 0.16 250.6)
-
Step 700
700
#0062AC
oklch(49% 0.141 250.5)
-
Step 800
800
#00508E
oklch(42.6% 0.122 250.5)
-
Step 900
900
#004378
oklch(37.8% 0.108 250.3)
-
Step 950
950
#00274A
oklch(26.9% 0.077 250.5)
#309AFA 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) | #6CA0FE | 0.052 |
| Deuteranopia (no green cones) | #4B8EF8 | 0.033 |
| Tritanopia (no blue cones) | #00B1BE | 0.125 |
| Achromatopsia (no color) | #969696 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #309AFA
#309AFA
oklch(67.4% 0.17 250.4)
- #CE8400
#CE8400
oklch(67.4% 0.146 70.4)
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 #309AFA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.022
- Dodger Blue #1E90FF ΔE 0.031
- Dark Sky Blue #448EE4 ΔE 0.041
- Cornflower Blue #6495ED ΔE 0.041
- Soft Blue #6488EA ΔE 0.057
- Water Blue #0E87CC ΔE 0.084
- Clear Blue #247AFD ΔE 0.085
- Cornflower #6A79F7 ΔE 0.089
Use #309AFA 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.