#309AE1
Closest named color: Chefchaouen Blue (#4895EF). oklch(66% 0.141 243.2), rgb(48, 154, 225).
Aa
Black text reads best on this color (6.83:1).
About this color
#309AE1 is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.141 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.031 away. Black text reads best on it, at 6.83:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.83:1 |
| White text | 3.07:1 |
Values
| HEX | #309AE1 |
| RGB | rgb(48, 154, 225) |
| HSL | hsl(204, 75%, 54%) |
| OKLCH | oklch(66% 0.141 243.2) |
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 #309AE1 | 3.07:1 | AA large text | Lc -62.6 | Content text, not long reading |
| Black text on #309AE1 | 6.83:1 | AA | Lc 46.9 | Large or bold text, headings |
| #309AE1 text on white | 3.07:1 | AA large text | Lc 57.2 | Large or bold text, headings |
| #309AE1 text on black | 6.83:1 | AA | Lc -44.6 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C4DDF1
oklch(88.5% 0.038 242.2)
-
Step 300
300
#9AC6EA
oklch(80.8% 0.069 243.4)
-
Step 400
400
#5FA8E0
oklch(70.7% 0.11 243.4)
-
Step 500
500 (this color)
#309AE1
oklch(66% 0.141 243.2)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005483
oklch(42.8% 0.104 243)
-
Step 900
900
#00456E
oklch(37.6% 0.092 243.7)
-
Step 950
950
#062940
oklch(27% 0.058 242.5)
#309AE1 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) | #799CE4 | 0.064 |
| Deuteranopia (no green cones) | #608CE0 | 0.048 |
| Tritanopia (no blue cones) | #00ABB3 | 0.097 |
| Achromatopsia (no color) | #939393 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #309AE1
#309AE1
oklch(66% 0.141 243.2)
- #CD7C1D
#CD7C1D
oklch(65.9% 0.141 63.3)
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 #309AE1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.031
- Dark Sky Blue #448EE4 ΔE 0.034
- Cornflower Blue #6495ED ΔE 0.047
- Dodger Blue #1E90FF ΔE 0.057
- Water Blue #0E87CC ΔE 0.061
- Soft Blue #6488EA ΔE 0.063
- Faded Blue #658CBB ΔE 0.068
- Cool Blue #4984B8 ΔE 0.076
Use #309AE1 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.