#21BFAA
Closest named color: Topaz (#13BBAF). oklch(72.4% 0.125 180.8), rgb(33, 191, 170).
Aa
Black text reads best on this color (9.09:1).
About this color
#21BFAA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.125 and its hue 181°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.016 away. Black text reads best on it, at 9.09:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.09:1 |
| White text | 2.30:1 |
Values
| HEX | #21BFAA |
| RGB | rgb(33, 191, 170) |
| HSL | hsl(172, 71%, 44%) |
| OKLCH | oklch(72.4% 0.125 180.8) |
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 #21BFAA | 2.30:1 | Fails | Lc -49.9 | Large or bold text, headings |
| Black text on #21BFAA | 9.09:1 | AAA | Lc 59.0 | Large or bold text, headings |
| #21BFAA text on white | 2.30:1 | Fails | Lc 45.0 | Large or bold text, headings |
| #21BFAA text on black | 9.09:1 | AAA | Lc -57.1 | 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
#EEF8F6
oklch(97.1% 0.011 182.9)
-
Step 100
100
#DBEFEA
oklch(93.6% 0.022 179.2)
-
Step 200
200
#BBE3DA
oklch(88.5% 0.044 180.1)
-
Step 300
300
#86D2C3
oklch(81% 0.079 180.3)
-
Step 400
400 (this color)
#21BFAA
oklch(72.4% 0.125 180.8)
-
Step 500
500
#009F8D
oklch(63% 0.114 181)
-
Step 600
600
#008676
oklch(55.6% 0.1 180.5)
-
Step 700
700
#007163
oklch(49.2% 0.089 180.3)
-
Step 800
800
#005C51
oklch(42.6% 0.077 181.1)
-
Step 900
900
#004D43
oklch(37.7% 0.068 180.3)
-
Step 950
950
#002E28
oklch(27% 0.049 181.5)
#21BFAA 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) | #B6B3A9 | 0.132 |
| Deuteranopia (no green cones) | #A2A4AC | 0.127 |
| Tritanopia (no blue cones) | #00C3B9 | 0.021 |
| Achromatopsia (no color) | #ABABAB | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21BFAA
#21BFAA
oklch(72.4% 0.125 180.8)
- #E583A1
#E583A1
oklch(72.4% 0.124 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 #21BFAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.016
- Greeny Blue #42B395 ΔE 0.037
- Light Sea Green #20B2AA ΔE 0.039
- Green Blue #01C08D ΔE 0.044
- Greenblue #23C48B ΔE 0.051
- Dark Turquoise #00CED1 ΔE 0.060
- Medium Aquamarine #66CDAA ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.065
Use #21BFAA 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.