#309AB2
Closest named color: Cadet Blue (#5F9EA0). oklch(63.7% 0.099 216.3), rgb(48, 154, 178).
Aa
Black text reads best on this color (6.39:1).
About this color
#309AB2 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.099 and its hue 216°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.047 away. Black text reads best on it, at 6.39:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.39:1 |
| White text | 3.28:1 |
Values
| HEX | #309AB2 |
| RGB | rgb(48, 154, 178) |
| HSL | hsl(191, 58%, 44%) |
| OKLCH | oklch(63.7% 0.099 216.3) |
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 #309AB2 | 3.28:1 | AA large text | Lc -65.3 | Content text, not long reading |
| Black text on #309AB2 | 6.39:1 | AA | Lc 44.2 | Non-text elements, placeholder text |
| #309AB2 text on white | 3.28:1 | AA large text | Lc 59.9 | Large or bold text, headings |
| #309AB2 text on black | 6.39:1 | AA | Lc -41.8 | 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
#F1F7F8
oklch(97.2% 0.007 208.8)
-
Step 100
100
#E0ECF0
oklch(93.5% 0.014 219.6)
-
Step 200
200
#C6DEE5
oklch(88.5% 0.027 217.2)
-
Step 300
300
#9EC9D5
oklch(80.9% 0.048 216.7)
-
Step 400
400
#64ADC0
oklch(70.7% 0.078 216.5)
-
Step 500
500 (this color)
#309AB2
oklch(63.7% 0.099 216.3)
-
Step 600
600
#008198
oklch(55.6% 0.099 216.1)
-
Step 700
700
#006C80
oklch(49% 0.087 216.4)
-
Step 800
800
#00596A
oklch(42.8% 0.076 216.6)
-
Step 900
900
#054A58
oklch(37.8% 0.065 216.5)
-
Step 950
950
#092B33
oklch(26.9% 0.041 216.6)
#309AB2 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) | #8A95B3 | 0.087 |
| Deuteranopia (no green cones) | #7888B2 | 0.079 |
| Tritanopia (no blue cones) | #00A3A1 | 0.045 |
| Achromatopsia (no color) | #8E8E8E | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #309AB2
#309AB2
oklch(63.7% 0.099 216.3)
- #BF7560
#BF7560
oklch(63.7% 0.099 36.6)
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 #309AB2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.047
- Sea #3C9992 ΔE 0.048
- Teal Green #0A9396 ΔE 0.048
- Blue NCS #118AB2 ΔE 0.051
- Persian Green #2A9D8F ΔE 0.058
- Blue Green #0F9B8E ΔE 0.060
- Teal Blue #01889F ΔE 0.060
- Dusty Blue #5A86AD ΔE 0.061
Use #309AB2 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.