#309BBC
Closest named color: Blue NCS (#118AB2). oklch(64.4% 0.105 223), rgb(48, 155, 188).
Aa
Black text reads best on this color (6.54:1).
About this color
#309BBC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.105 and its hue 223°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.053 away. Black text reads best on it, at 6.54:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 6.54:1 |
| White text | 3.21:1 |
Values
| HEX | #309BBC |
| RGB | rgb(48, 155, 188) |
| HSL | hsl(194, 59%, 46%) |
| OKLCH | oklch(64.4% 0.105 223) |
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 #309BBC | 3.21:1 | AA large text | Lc -64.4 | Content text, not long reading |
| Black text on #309BBC | 6.54:1 | AA | Lc 45.1 | Large or bold text, headings |
| #309BBC text on white | 3.21:1 | AA large text | Lc 59.0 | Large or bold text, headings |
| #309BBC text on black | 6.54:1 | AA | Lc -42.8 | 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
#F1F7F9
oklch(97.2% 0.007 219.6)
-
Step 100
100
#E0ECF1
oklch(93.6% 0.015 224.5)
-
Step 200
200
#C6DEE7
oklch(88.6% 0.028 222.3)
-
Step 300
300
#9DC9D9
oklch(81% 0.052 222.1)
-
Step 400
400
#63ACC6
oklch(70.7% 0.082 223.2)
-
Step 500
500 (this color)
#309BBC
oklch(64.4% 0.105 223)
-
Step 600
600
#00809F
oklch(55.6% 0.103 222.6)
-
Step 700
700
#006B86
oklch(49% 0.091 223.1)
-
Step 800
800
#00586F
oklch(42.7% 0.08 223.4)
-
Step 900
900
#03495C
oklch(37.7% 0.069 223.1)
-
Step 950
950
#082B36
oklch(27% 0.044 223.1)
#309BBC 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) | #8897BE | 0.084 |
| Deuteranopia (no green cones) | #758ABC | 0.073 |
| Tritanopia (no blue cones) | #00A5A6 | 0.053 |
| Achromatopsia (no color) | #909090 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #309BBC
#309BBC
oklch(64.4% 0.105 223)
- #C37758
#C37758
oklch(64.4% 0.105 42.7)
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 #309BBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.053
- Cadet Blue #5F9EA0 ΔE 0.055
- Faded Blue #658CBB ΔE 0.056
- Turquoise Blue #06B1C4 ΔE 0.061
- Dusty Blue #5A86AD ΔE 0.061
- Teal Green #0A9396 ΔE 0.062
- Sea #3C9992 ΔE 0.063
- Cool Blue #4984B8 ΔE 0.065
Use #309BBC 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.