#21C4BC
Closest named color: Topaz (#13BBAF). oklch(74.2% 0.123 189.5), rgb(33, 196, 188).
Aa
Black text reads best on this color (9.68:1).
About this color
#21C4BC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.123 and its hue 189°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.029 away. Black text reads best on it, at 9.68:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.68:1 |
| White text | 2.16:1 |
Values
| HEX | #21C4BC |
| RGB | rgb(33, 196, 188) |
| HSL | hsl(177, 71%, 45%) |
| OKLCH | oklch(74.2% 0.123 189.5) |
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 #21C4BC | 2.16:1 | Fails | Lc -46.8 | Large or bold text, headings |
| Black text on #21C4BC | 9.68:1 | AAA | Lc 61.9 | Content text, not long reading |
| #21C4BC text on white | 2.16:1 | Fails | Lc 42.1 | Non-text elements, placeholder text |
| #21C4BC text on black | 9.68:1 | AAA | Lc -60.1 | 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
#EEF8F7
oklch(97.1% 0.011 189.8)
-
Step 100
100
#DAEFED
oklch(93.6% 0.022 189.9)
-
Step 200
200
#BAE3DF
oklch(88.6% 0.043 189.1)
-
Step 300
300
#84D1CB
oklch(80.9% 0.077 189.5)
-
Step 400
400 (this color)
#21C4BC
oklch(74.2% 0.123 189.5)
-
Step 500
500
#009E97
oklch(63.1% 0.109 189.2)
-
Step 600
600
#00857F
oklch(55.6% 0.096 189.2)
-
Step 700
700
#00706B
oklch(49.2% 0.085 189.4)
-
Step 800
800
#005C58
oklch(42.8% 0.074 189.6)
-
Step 900
900
#004C49
oklch(37.6% 0.065 190.2)
-
Step 950
950
#002E2B
oklch(27.1% 0.047 188)
#21C4BC 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) | #B8B9BC | 0.130 |
| Deuteranopia (no green cones) | #A3A9BD | 0.123 |
| Tritanopia (no blue cones) | #00C9C1 | 0.014 |
| Achromatopsia (no color) | #B0B0B0 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C4BC
#21C4BC
oklch(74.2% 0.123 189.5)
- #EE899A
#EE899A
oklch(74.2% 0.124 9.7)
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 #21C4BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.029
- Dark Turquoise #00CED1 ΔE 0.035
- Medium Turquoise #48D1CC ΔE 0.045
- Light Sea Green #20B2AA ΔE 0.052
- Medium Aquamarine #66CDAA ΔE 0.056
- Greeny Blue #42B395 ΔE 0.061
- Turquoise Blue #06B1C4 ΔE 0.061
- Green Blue #01C08D ΔE 0.067
Use #21C4BC 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.