#21C7B5
Closest named color: Topaz (#13BBAF). oklch(74.8% 0.128 183.2), rgb(33, 199, 181).
Aa
Black text reads best on this color (9.90:1).
About this color
#21C7B5 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.128 and its hue 183°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.035 away. Black text reads best on it, at 9.90:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.90:1 |
| White text | 2.12:1 |
Values
| HEX | #21C7B5 |
| RGB | rgb(33, 199, 181) |
| HSL | hsl(173, 72%, 45%) |
| OKLCH | oklch(74.8% 0.128 183.2) |
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 #21C7B5 | 2.12:1 | Fails | Lc -45.7 | Large or bold text, headings |
| Black text on #21C7B5 | 9.90:1 | AAA | Lc 62.9 | Content text, not long reading |
| #21C7B5 text on white | 2.12:1 | Fails | Lc 41.0 | Non-text elements, placeholder text |
| #21C7B5 text on black | 9.90:1 | AAA | Lc -61.2 | Content text, not long reading |
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
#DAEFEB
oklch(93.6% 0.023 183.2)
-
Step 200
200
#BAE3DC
oklch(88.5% 0.044 183.8)
-
Step 300
300
#83D2C5
oklch(80.9% 0.08 182.7)
-
Step 400
400 (this color)
#21C7B5
oklch(74.8% 0.128 183.2)
-
Step 500
500
#009F90
oklch(63.1% 0.112 183.2)
-
Step 600
600
#008679
oklch(55.7% 0.099 183.1)
-
Step 700
700
#007065
oklch(49% 0.087 183.1)
-
Step 800
800
#005C53
oklch(42.6% 0.076 183.4)
-
Step 900
900
#004D45
oklch(37.7% 0.067 183.1)
-
Step 950
950
#002E29
oklch(27.1% 0.048 183.6)
#21C7B5 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) | #BDBBB4 | 0.136 |
| Deuteranopia (no green cones) | #A8ACB7 | 0.128 |
| Tritanopia (no blue cones) | #00CBC1 | 0.017 |
| Achromatopsia (no color) | #B2B2B2 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C7B5
#21C7B5
oklch(74.8% 0.128 183.2)
- #F089A5
#F089A5
oklch(74.8% 0.129 3.2)
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 #21C7B5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.035
- Dark Turquoise #00CED1 ΔE 0.039
- Medium Turquoise #48D1CC ΔE 0.045
- Medium Aquamarine #66CDAA ΔE 0.045
- Green Blue #01C08D ΔE 0.057
- Greenblue #23C48B ΔE 0.058
- Light Sea Green #20B2AA ΔE 0.059
- Emerald #06D6A0 ΔE 0.060
Use #21C7B5 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.