#1BBB57
Closest named color: Cool Green (#33B864). oklch(69.4% 0.187 149.4), rgb(27, 187, 87).
Aa
Black text reads best on this color (8.29:1).
About this color
#1BBB57 is a medium-light, vivid green. In OKLCH its lightness is 69%, its chroma 0.187 and its hue 149°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Cool Green (#33B864), ΔE 0.022 away. Black text reads best on it, at 8.29:1.
| Hue family | Greens |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.187) |
| Temperature | in between |
| Nearest name | Cool Green (#33B864) |
| Black text | 8.29:1 |
| White text | 2.53:1 |
Values
| HEX | #1BBB57 |
| RGB | rgb(27, 187, 87) |
| HSL | hsl(143, 75%, 42%) |
| OKLCH | oklch(69.4% 0.187 149.4) |
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 #1BBB57 | 2.53:1 | Fails | Lc -54.1 | Large or bold text, headings |
| Black text on #1BBB57 | 8.29:1 | AAA | Lc 55.0 | Large or bold text, headings |
| #1BBB57 text on white | 2.53:1 | Fails | Lc 49.0 | Large or bold text, headings |
| #1BBB57 text on black | 8.29:1 | AAA | Lc -52.9 | 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
#EFF9F0
oklch(97.2% 0.016 148.4)
-
Step 100
100
#DBF1DE
oklch(93.7% 0.034 149.3)
-
Step 200
200
#BCE6C2
oklch(88.5% 0.066 149)
-
Step 300
300
#88D697
oklch(80.9% 0.118 149.3)
-
Step 400
400 (this color)
#1BBB57
oklch(69.4% 0.187 149.4)
-
Step 500
500
#00A549
oklch(63.1% 0.176 149.5)
-
Step 600
600
#008B3C
oklch(55.6% 0.155 149.4)
-
Step 700
700
#007531
oklch(49.1% 0.138 149.3)
-
Step 800
800
#006027
oklch(42.7% 0.12 149.3)
-
Step 900
900
#005020
oklch(37.7% 0.105 149.6)
-
Step 950
950
#003010
oklch(27% 0.075 149.4)
#1BBB57 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) | #BCAA4E | 0.151 |
| Deuteranopia (no green cones) | #AC9E5F | 0.151 |
| Tritanopia (no blue cones) | #00B7A4 | 0.106 |
| Achromatopsia (no color) | #A3A3A3 | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1BBB57
#1BBB57
oklch(69.4% 0.187 149.4)
- #DA6BD4
#DA6BD4
oklch(69.4% 0.187 329.4)
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 #1BBB57, closest first.
No curated palette has a color within ΔE 0.04 of #1BBB57.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Green #33B864 ΔE 0.022
- Shamrock Green #02C14D ΔE 0.023
- Shamrock #01B44C ΔE 0.023
- Leafy Green #51B73B ΔE 0.030
- Algae Green #21C36F ΔE 0.032
- Dark Mint Green #20C073 ΔE 0.033
- Medium Green #39AD48 ΔE 0.038
- Dark Mint #48C072 ΔE 0.042
Use #1BBB57 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.