#308FE9
Closest named color: Dark Sky Blue (#448EE4). oklch(64% 0.16 251), rgb(48, 143, 233).
Aa
Black text reads best on this color (6.23:1).
About this color
#308FE9 is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.160 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.014 away. Black text reads best on it, at 6.23:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.23:1 |
| White text | 3.37:1 |
Values
| HEX | #308FE9 |
| RGB | rgb(48, 143, 233) |
| HSL | hsl(209, 81%, 55%) |
| OKLCH | oklch(64% 0.16 251) |
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 #308FE9 | 3.37:1 | AA large text | Lc -66.2 | Content text, not long reading |
| Black text on #308FE9 | 6.23:1 | AA | Lc 43.4 | Non-text elements, placeholder text |
| #308FE9 text on white | 3.37:1 | AA large text | Lc 60.7 | Content text, not long reading |
| #308FE9 text on black | 6.23:1 | AA | Lc -41.0 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF6
oklch(88.6% 0.044 251.5)
-
Step 300
300
#9BC5F2
oklch(80.9% 0.078 250.5)
-
Step 400
400
#61A5EC
oklch(70.7% 0.126 250.9)
-
Step 500
500 (this color)
#308FE9
oklch(64% 0.16 251)
-
Step 600
600
#0075CD
oklch(55.6% 0.161 250.9)
-
Step 700
700
#0062AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#005090
oklch(42.7% 0.125 251.1)
-
Step 900
900
#074376
oklch(37.7% 0.104 250.7)
-
Step 950
950
#082745
oklch(26.8% 0.066 251.2)
#308FE9 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) | #6495ED | 0.048 |
| Deuteranopia (no green cones) | #4684E7 | 0.030 |
| Tritanopia (no blue cones) | #00A4B1 | 0.117 |
| Achromatopsia (no color) | #8C8C8C | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #308FE9
#308FE9
oklch(64% 0.16 251)
- #BF7B00
#BF7B00
oklch(63.9% 0.138 71.1)
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 #308FE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.014
- Chefchaouen Blue #4895EF ΔE 0.026
- Dodger Blue #1E90FF ΔE 0.033
- Soft Blue #6488EA ΔE 0.044
- Cornflower Blue #6495ED ΔE 0.048
- Water Blue #0E87CC ΔE 0.051
- Clear Blue #247AFD ΔE 0.067
- Cool Blue #4984B8 ΔE 0.074
Use #308FE9 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.