#309BCB
Closest named color: Faded Blue (#658CBB). oklch(65.1% 0.118 232.5), rgb(48, 155, 203).
Aa
Black text reads best on this color (6.67:1).
About this color
#309BCB is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.118 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.054 away. Black text reads best on it, at 6.67:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.67:1 |
| White text | 3.14:1 |
Values
| HEX | #309BCB |
| RGB | rgb(48, 155, 203) |
| HSL | hsl(199, 62%, 49%) |
| OKLCH | oklch(65.1% 0.118 232.5) |
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 #309BCB | 3.14:1 | AA large text | Lc -63.6 | Content text, not long reading |
| Black text on #309BCB | 6.67:1 | AA | Lc 45.9 | Large or bold text, headings |
| #309BCB text on white | 3.14:1 | AA large text | Lc 58.2 | Large or bold text, headings |
| #309BCB text on black | 6.67:1 | AA | Lc -43.6 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#DFECF3
oklch(93.5% 0.017 230.9)
-
Step 200
200
#C5DDEB
oklch(88.4% 0.032 233.3)
-
Step 300
300
#9CC8E0
oklch(81% 0.057 232.2)
-
Step 400
400
#61ABD1
oklch(70.8% 0.092 232.5)
-
Step 500
500 (this color)
#309BCB
oklch(65.1% 0.118 232.5)
-
Step 600
600
#007EAB
oklch(55.7% 0.114 232.4)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#014863
oklch(37.7% 0.076 232)
-
Step 950
950
#072A3A
oklch(26.9% 0.049 232.7)
#309BCB 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) | #8399CD | 0.076 |
| Deuteranopia (no green cones) | #6E8BCA | 0.064 |
| Tritanopia (no blue cones) | #00A8AB | 0.072 |
| Achromatopsia (no color) | #919191 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #309BCB
#309BCB
oklch(65.1% 0.118 232.5)
- #C77946
#C77946
oklch(65% 0.118 52.4)
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 #309BCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.059
- Blue NCS #118AB2 ΔE 0.060
- Water Blue #0E87CC ΔE 0.062
- Chefchaouen Blue #4895EF ΔE 0.064
- Cool Blue #4984B8 ΔE 0.064
- Dusty Blue #5A86AD ΔE 0.066
- Turquoise Blue #06B1C4 ΔE 0.067
Use #309BCB 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.