#31B59D
Closest named color: Greeny Blue (#42B395). oklch(69.8% 0.117 177.5), rgb(49, 181, 157).
Aa
Black text reads best on this color (8.22:1).
About this color
#31B59D is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 70%, its chroma 0.117 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.012 away. Black text reads best on it, at 8.22:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 8.22:1 |
| White text | 2.55:1 |
Values
| HEX | #31B59D |
| RGB | rgb(49, 181, 157) |
| HSL | hsl(169, 57%, 45%) |
| OKLCH | oklch(69.8% 0.117 177.5) |
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 #31B59D | 2.55:1 | Fails | Lc -54.7 | Large or bold text, headings |
| Black text on #31B59D | 8.22:1 | AAA | Lc 54.4 | Large or bold text, headings |
| #31B59D text on white | 2.55:1 | Fails | Lc 49.6 | Large or bold text, headings |
| #31B59D text on black | 8.22:1 | AAA | Lc -52.4 | 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 400.
-
Step 50
50
#EFF8F5
oklch(97.2% 0.01 174.3)
-
Step 100
100
#DCEFEA
oklch(93.7% 0.021 178.3)
-
Step 200
200
#BEE2D9
oklch(88.4% 0.04 178.5)
-
Step 300
300
#8CD1C0
oklch(81% 0.074 177.1)
-
Step 400
400 (this color)
#31B59D
oklch(69.8% 0.117 177.5)
-
Step 500
500
#00A089
oklch(63.1% 0.116 177.6)
-
Step 600
600
#008673
oklch(55.5% 0.102 178.1)
-
Step 700
700
#007160
oklch(49.1% 0.091 177.4)
-
Step 800
800
#005D4F
oklch(42.8% 0.079 177.8)
-
Step 900
900
#004D41
oklch(37.6% 0.069 177.7)
-
Step 950
950
#002E26
oklch(26.9% 0.05 177.5)
#31B59D 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) | #AEAA9C | 0.123 |
| Deuteranopia (no green cones) | #9C9D9F | 0.116 |
| Tritanopia (no blue cones) | #00B8AE | 0.024 |
| Achromatopsia (no color) | #A2A2A2 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31B59D
#31B59D
oklch(69.8% 0.117 177.5)
- #D77E9E
#D77E9E
oklch(69.8% 0.116 357.5)
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 #31B59D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.012
- Light Sea Green #20B2AA ΔE 0.024
- Topaz #13BBAF ΔE 0.026
- Green Blue #01C08D ΔE 0.046
- Bluey Green #2BB179 ΔE 0.050
- Tea #65AB7C ΔE 0.050
- Dark Seafoam Green #3EAF76 ΔE 0.051
- Dark Seafoam #1FB57A ΔE 0.052
Use #31B59D 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.