#308CE3
Closest named color: Dark Sky Blue (#448EE4). oklch(62.9% 0.156 250.9), rgb(48, 140, 227).
Aa
Black text reads best on this color (5.98:1).
About this color
#308CE3 is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.156 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.016 away. Black text reads best on it, at 5.98:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.98:1 |
| White text | 3.50:1 |
Values
| HEX | #308CE3 |
| RGB | rgb(48, 140, 227) |
| HSL | hsl(209, 76%, 54%) |
| OKLCH | oklch(62.9% 0.156 250.9) |
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 #308CE3 | 3.50:1 | AA large text | Lc -67.7 | Content text, not long reading |
| Black text on #308CE3 | 5.98:1 | AA | Lc 41.9 | Non-text elements, placeholder text |
| #308CE3 text on white | 3.50:1 | AA large text | Lc 62.2 | Content text, not long reading |
| #308CE3 text on black | 5.98:1 | AA | Lc -39.5 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF5
oklch(88.5% 0.042 250.5)
-
Step 300
300
#9CC5F1
oklch(81% 0.076 250.6)
-
Step 400
400
#63A5EA
oklch(70.7% 0.122 250.9)
-
Step 500
500 (this color)
#308CE3
oklch(62.9% 0.156 250.9)
-
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
#00508F
oklch(42.6% 0.123 250.8)
-
Step 900
900
#0A4375
oklch(37.7% 0.102 250.8)
-
Step 950
950
#092845
oklch(27.1% 0.065 250.4)
#308CE3 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) | #6292E7 | 0.047 |
| Deuteranopia (no green cones) | #4681E1 | 0.030 |
| Tritanopia (no blue cones) | #00A1AC | 0.116 |
| Achromatopsia (no color) | #898989 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #308CE3
#308CE3
oklch(62.9% 0.156 250.9)
- #BB7800
#BB7800
oklch(62.8% 0.135 70.8)
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 #308CE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.016
- Chefchaouen Blue #4895EF ΔE 0.035
- Water Blue #0E87CC ΔE 0.040
- Dodger Blue #1E90FF ΔE 0.041
- Soft Blue #6488EA ΔE 0.046
- Cornflower Blue #6495ED ΔE 0.055
- Cool Blue #4984B8 ΔE 0.065
- Clear Blue #247AFD ΔE 0.066
Use #308CE3 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.