#309EA5
Closest named color: Sea (#3C9992). oklch(64.2% 0.096 201.3), rgb(48, 158, 165).
Aa
Black text reads best on this color (6.55:1).
About this color
#309EA5 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.096 and its hue 201°. Its hue sits on the cool side of the wheel. The nearest named color is Sea (#3C9992), ΔE 0.028 away. Black text reads best on it, at 6.55:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Sea (#3C9992) |
| Black text | 6.55:1 |
| White text | 3.20:1 |
Values
| HEX | #309EA5 |
| RGB | rgb(48, 158, 165) |
| HSL | hsl(184, 55%, 42%) |
| OKLCH | oklch(64.2% 0.096 201.3) |
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 #309EA5 | 3.20:1 | AA large text | Lc -64.3 | Content text, not long reading |
| Black text on #309EA5 | 6.55:1 | AA | Lc 45.2 | Large or bold text, headings |
| #309EA5 text on white | 3.20:1 | AA large text | Lc 58.9 | Large or bold text, headings |
| #309EA5 text on black | 6.55:1 | AA | Lc -42.9 | 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
#F1F7F7
oklch(97.2% 0.006 197.1)
-
Step 100
100
#E0EDEE
oklch(93.7% 0.014 202.5)
-
Step 200
200
#C6DFE0
oklch(88.6% 0.027 199.6)
-
Step 300
300
#9ECACD
oklch(80.9% 0.046 201.5)
-
Step 400
400
#64AFB4
oklch(70.7% 0.075 201.2)
-
Step 500
500 (this color)
#309EA5
oklch(64.2% 0.096 201.3)
-
Step 600
600
#00838A
oklch(55.5% 0.094 201.4)
-
Step 700
700
#006E74
oklch(49% 0.083 201.4)
-
Step 800
800
#005A5F
oklch(42.5% 0.072 201.4)
-
Step 900
900
#044B4F
oklch(37.6% 0.062 201.1)
-
Step 950
950
#082C2E
oklch(26.9% 0.04 200.4)
#309EA5 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) | #9297A6 | 0.097 |
| Deuteranopia (no green cones) | #818AA6 | 0.091 |
| Tritanopia (no blue cones) | #00A4A0 | 0.024 |
| Achromatopsia (no color) | #909090 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #309EA5
#309EA5
oklch(64.2% 0.096 201.3)
- #C07473
#C07473
oklch(64.1% 0.096 20.9)
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 #309EA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea #3C9992 ΔE 0.028
- Persian Green #2A9D8F ΔE 0.034
- Cadet Blue #5F9EA0 ΔE 0.035
- Blue Green #0F9B8E ΔE 0.038
- Teal Green #0A9396 ΔE 0.041
- Dull Teal #5F9E8F ΔE 0.045
- Grey Teal #5E9B8A ΔE 0.047
- Dusty Teal #4C9085 ΔE 0.052
Use #309EA5 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.