#309FC9
Closest named color: Turquoise Blue (#06B1C4). oklch(66% 0.114 228.2), rgb(48, 159, 201).
Aa
Black text reads best on this color (6.92:1).
About this color
#309FC9 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.114 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.054 away. Black text reads best on it, at 6.92:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 6.92:1 |
| White text | 3.03:1 |
Values
| HEX | #309FC9 |
| RGB | rgb(48, 159, 201) |
| HSL | hsl(196, 61%, 49%) |
| OKLCH | oklch(66% 0.114 228.2) |
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 #309FC9 | 3.03:1 | AA large text | Lc -62.1 | Content text, not long reading |
| Black text on #309FC9 | 6.92:1 | AA | Lc 47.3 | Large or bold text, headings |
| #309FC9 text on white | 3.03:1 | AA large text | Lc 56.7 | Large or bold text, headings |
| #309FC9 text on black | 6.92:1 | AA | Lc -45.1 | 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
#F1F7F9
oklch(97.2% 0.007 219.6)
-
Step 100
100
#DFECF2
oklch(93.5% 0.016 227)
-
Step 200
200
#C5DEEA
oklch(88.6% 0.031 228.2)
-
Step 300
300
#9BC8DD
oklch(80.8% 0.056 228.2)
-
Step 400
400
#60ACCD
oklch(70.8% 0.089 228.2)
-
Step 500
500 (this color)
#309FC9
oklch(66% 0.114 228.2)
-
Step 600
600
#007FA5
oklch(55.7% 0.108 227.8)
-
Step 700
700
#006A8B
oklch(49% 0.096 228.3)
-
Step 800
800
#005773
oklch(42.7% 0.084 228.5)
-
Step 900
900
#004960
oklch(37.8% 0.073 227.3)
-
Step 950
950
#062B39
oklch(27.1% 0.048 228.1)
#309FC9 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) | #899CCB | 0.082 |
| Deuteranopia (no green cones) | #748EC8 | 0.070 |
| Tritanopia (no blue cones) | #00ABAD | 0.064 |
| Achromatopsia (no color) | #949494 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #309FC9
#309FC9
oklch(66% 0.114 228.2)
- #CA7B51
#CA7B51
oklch(65.9% 0.114 48)
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 #309FC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.054
- Faded Blue #658CBB ΔE 0.060
- Greyblue #77A1B5 ΔE 0.065
- Cadet Blue #5F9EA0 ΔE 0.066
- Blue NCS #118AB2 ΔE 0.067
- Dark Sky Blue #448EE4 ΔE 0.070
- Chefchaouen Blue #4895EF ΔE 0.072
- Dusty Blue #5A86AD ΔE 0.073
Use #309FC9 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.