#3FB978
Closest named color: Medium Sea Green (#3CB371). oklch(70.2% 0.144 156), rgb(63, 185, 120).
Aa
Black text reads best on this color (8.42:1).
About this color
#3FB978 is a medium-light, vivid green. In OKLCH its lightness is 70%, its chroma 0.144 and its hue 156°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Medium Sea Green (#3CB371), ΔE 0.018 away. Black text reads best on it, at 8.42:1.
| Hue family | Greens |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.144) |
| Temperature | in between |
| Nearest name | Medium Sea Green (#3CB371) |
| Black text | 8.42:1 |
| White text | 2.49:1 |
Values
| HEX | #3FB978 |
| RGB | rgb(63, 185, 120) |
| HSL | hsl(148, 49%, 49%) |
| OKLCH | oklch(70.2% 0.144 156) |
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 #3FB978 | 2.49:1 | Fails | Lc -53.7 | Large or bold text, headings |
| Black text on #3FB978 | 8.42:1 | AAA | Lc 55.4 | Large or bold text, headings |
| #3FB978 text on white | 2.49:1 | Fails | Lc 48.6 | Large or bold text, headings |
| #3FB978 text on black | 8.42:1 | AAA | Lc -53.4 | 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
#EFF8F2
oklch(97.1% 0.012 157)
-
Step 100
100
#DDEFE3
oklch(93.5% 0.025 156.7)
-
Step 200
200
#BFE4CB
oklch(88.5% 0.052 155.7)
-
Step 300
300
#90D2A8
oklch(80.8% 0.09 155.9)
-
Step 400
400 (this color)
#3FB978
oklch(70.2% 0.144 156)
-
Step 500
500
#00A460
oklch(63.2% 0.154 155.8)
-
Step 600
600
#008A50
oklch(55.7% 0.136 155.8)
-
Step 700
700
#007443
oklch(49.1% 0.119 156.1)
-
Step 800
800
#005F36
oklch(42.7% 0.103 156.1)
-
Step 900
900
#004F2C
oklch(37.6% 0.091 156.1)
-
Step 950
950
#002F18
oklch(26.8% 0.065 156.1)
#3FB978 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) | #B8AB74 | 0.130 |
| Deuteranopia (no green cones) | #A89F7C | 0.128 |
| Tritanopia (no blue cones) | #00B7A8 | 0.069 |
| Achromatopsia (no color) | #A4A4A4 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3FB978
#3FB978
oklch(70.2% 0.144 156)
- #D67AC1
#D67AC1
oklch(70.3% 0.144 336.1)
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 #3FB978, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Sea Green #3CB371 ΔE 0.018
- Dark Seafoam #1FB57A ΔE 0.020
- Green Teal #0CB577 ΔE 0.023
- Dark Mint #48C072 ΔE 0.025
- Dark Mint Green #20C073 ΔE 0.026
- Cool Green #33B864 ΔE 0.027
- Bluey Green #2BB179 ΔE 0.028
- Green Blue #01C08D ΔE 0.029
Use #3FB978 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.