#1B9563
Closest named color: Viridian (#1E9167). oklch(59.4% 0.128 159.7), rgb(27, 149, 99).
Aa
Black text reads best on this color (5.52:1).
About this color
#1B9563 is a medium-dark, moderately saturated green. In OKLCH its lightness is 59%, its chroma 0.128 and its hue 160°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Viridian (#1E9167), ΔE 0.015 away. Black text reads best on it, at 5.52:1.
| Hue family | Greens |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.128) |
| Temperature | in between |
| Nearest name | Viridian (#1E9167) |
| Black text | 5.52:1 |
| White text | 3.80:1 |
Values
| HEX | #1B9563 |
| RGB | rgb(27, 149, 99) |
| HSL | hsl(155, 69%, 35%) |
| OKLCH | oklch(59.4% 0.128 159.7) |
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 #1B9563 | 3.80:1 | AA large text | Lc -70.6 | Content text, not long reading |
| Black text on #1B9563 | 5.52:1 | AA | Lc 39.0 | Non-text elements, placeholder text |
| #1B9563 text on white | 3.80:1 | AA large text | Lc 65.1 | Content text, not long reading |
| #1B9563 text on black | 5.52:1 | AA | Lc -36.6 | 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
#F1F7F3
oklch(97.1% 0.008 157.1)
-
Step 100
100
#E0EEE6
oklch(93.6% 0.018 161.1)
-
Step 200
200
#C7E1D1
oklch(88.6% 0.035 158.6)
-
Step 300
300
#9ECEB3
oklch(81% 0.063 160)
-
Step 400
400
#65B48B
oklch(70.8% 0.1 159.7)
-
Step 500
500 (this color)
#1B9563
oklch(59.4% 0.128 159.7)
-
Step 600
600
#008958
oklch(55.6% 0.127 159.5)
-
Step 700
700
#00734A
oklch(49% 0.111 160)
-
Step 800
800
#005F3C
oklch(42.8% 0.097 159.8)
-
Step 900
900
#054F32
oklch(37.8% 0.083 159.8)
-
Step 950
950
#092E1D
oklch(27% 0.053 159.5)
#1B9563 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) | #938960 | 0.119 |
| Deuteranopia (no green cones) | #857F66 | 0.116 |
| Tritanopia (no blue cones) | #009488 | 0.055 |
| Achromatopsia (no color) | #838383 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B9563
#1B9563
oklch(59.4% 0.128 159.7)
- #AF5E97
#AF5E97
oklch(59.5% 0.127 339.4)
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 #1B9563, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Viridian #1E9167 ΔE 0.015
- Sea Green #2E8B57 ΔE 0.029
- Ocean Green #3D9973 ΔE 0.033
- Light Forest Green #4F9153 ΔE 0.033
- Fern Green #548D44 ΔE 0.046
- Jade #1FA774 ΔE 0.054
- Kelley Green #009337 ΔE 0.054
- Dark Sage #598556 ΔE 0.056
Use #1B9563 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.