#309EE3
Closest named color: Chefchaouen Blue (#4895EF). oklch(67% 0.14 241.6), rgb(48, 158, 227).
Aa
Black text reads best on this color (7.12:1).
About this color
#309EE3 is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.140 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.036 away. Black text reads best on it, at 7.12:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.12:1 |
| White text | 2.94:1 |
Values
| HEX | #309EE3 |
| RGB | rgb(48, 158, 227) |
| HSL | hsl(203, 76%, 54%) |
| OKLCH | oklch(67% 0.14 241.6) |
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 #309EE3 | 2.94:1 | Fails | Lc -60.9 | Content text, not long reading |
| Black text on #309EE3 | 7.12:1 | AAA | Lc 48.5 | Large or bold text, headings |
| #309EE3 text on white | 2.94:1 | Fails | Lc 55.5 | Large or bold text, headings |
| #309EE3 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DCECFA
oklch(93.5% 0.026 244.4)
-
Step 200
200
#BEDEF7
oklch(88.5% 0.048 241.7)
-
Step 300
300
#8DC8F4
oklch(80.8% 0.087 241.4)
-
Step 400
400 (this color)
#309EE3
oklch(67% 0.14 241.6)
-
Step 500
500
#0092DA
oklch(63.1% 0.148 241.4)
-
Step 600
600
#007AB8
oklch(55.5% 0.131 241.7)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#002942
oklch(26.9% 0.063 241.6)
#309EE3 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) | #7E9FE6 | 0.068 |
| Deuteranopia (no green cones) | #658FE2 | 0.053 |
| Tritanopia (no blue cones) | #00AFB6 | 0.095 |
| Achromatopsia (no color) | #969696 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #309EE3
#309EE3
oklch(67% 0.14 241.6)
- #D17F27
#D17F27
oklch(67% 0.14 62.1)
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 #309EE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.044
- Cornflower Blue #6495ED ΔE 0.048
- Dodger Blue #1E90FF ΔE 0.063
- Soft Blue #6488EA ΔE 0.069
- Water Blue #0E87CC ΔE 0.072
- Faded Blue #658CBB ΔE 0.073
- Turquoise Blue #06B1C4 ΔE 0.081
Use #309EE3 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.