#309ED7
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.4% 0.128 236.5), rgb(48, 158, 215).
Aa
Black text reads best on this color (6.99:1).
About this color
#309ED7 is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.128 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.051 away. Black text reads best on it, at 6.99:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.99:1 |
| White text | 3.00:1 |
Values
| HEX | #309ED7 |
| RGB | rgb(48, 158, 215) |
| HSL | hsl(200, 68%, 52%) |
| OKLCH | oklch(66.4% 0.128 236.5) |
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 #309ED7 | 3.00:1 | AA large text | Lc -61.6 | Content text, not long reading |
| Black text on #309ED7 | 6.99:1 | AA | Lc 47.8 | Large or bold text, headings |
| #309ED7 text on white | 3.00:1 | AA large text | Lc 56.3 | Large or bold text, headings |
| #309ED7 text on black | 6.99:1 | AA | Lc -45.5 | 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 500.
-
Step 50
50
#F0F6FA
oklch(97% 0.008 236.6)
-
Step 100
100
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C4DDED
oklch(88.4% 0.035 235.9)
-
Step 300
300
#9BC7E4
oklch(80.8% 0.062 237.4)
-
Step 400
400
#5EAAD7
oklch(70.7% 0.1 236.5)
-
Step 500
500 (this color)
#309ED7
oklch(66.4% 0.128 236.5)
-
Step 600
600
#007CB0
oklch(55.5% 0.121 236.7)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#062A3D
oklch(27.1% 0.053 236.9)
#309ED7 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) | #839EDA | 0.075 |
| Deuteranopia (no green cones) | #6C8ED6 | 0.061 |
| Tritanopia (no blue cones) | #00ADB2 | 0.081 |
| Achromatopsia (no color) | #959595 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #309ED7
#309ED7
oklch(66.4% 0.128 236.5)
- #CE7D3D
#CE7D3D
oklch(66.5% 0.128 56.3)
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 #309ED7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.053
- Cornflower Blue #6495ED ΔE 0.060
- Faded Blue #658CBB ΔE 0.063
- Water Blue #0E87CC ΔE 0.068
- Turquoise Blue #06B1C4 ΔE 0.068
- Blue NCS #118AB2 ΔE 0.076
- Cool Blue #4984B8 ΔE 0.076
Use #309ED7 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.