#21C4BF
Closest named color: Topaz (#13BBAF). oklch(74.3% 0.123 191.5), rgb(33, 196, 191).
Aa
Black text reads best on this color (9.71:1).
About this color
#21C4BF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.123 and its hue 191°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.031 away. Black text reads best on it, at 9.71:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.71:1 |
| White text | 2.16:1 |
Values
| HEX | #21C4BF |
| RGB | rgb(33, 196, 191) |
| HSL | hsl(178, 71%, 45%) |
| OKLCH | oklch(74.3% 0.123 191.5) |
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 #21C4BF | 2.16:1 | Fails | Lc -46.6 | Large or bold text, headings |
| Black text on #21C4BF | 9.71:1 | AAA | Lc 62.0 | Content text, not long reading |
| #21C4BF text on white | 2.16:1 | Fails | Lc 42.0 | Non-text elements, placeholder text |
| #21C4BF text on black | 9.71:1 | AAA | Lc -60.3 | 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
#BAE3E0
oklch(88.6% 0.043 190.9)
-
Step 300
300
#84D1CD
oklch(81% 0.076 191.5)
-
Step 400
400 (this color)
#21C4BF
oklch(74.3% 0.123 191.5)
-
Step 500
500
#009E9A
oklch(63.2% 0.109 191.6)
-
Step 600
600
#008581
oklch(55.7% 0.096 191.1)
-
Step 700
700
#00706D
oklch(49.2% 0.085 191.5)
-
Step 800
800
#005B59
oklch(42.6% 0.073 192.2)
-
Step 900
900
#004C4A
oklch(37.6% 0.065 191.7)
-
Step 950
950
#002D2C
oklch(26.9% 0.046 192.5)
#21C4BF 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) | #B8B9BF | 0.130 |
| Deuteranopia (no green cones) | #A2AAC0 | 0.121 |
| Tritanopia (no blue cones) | #00CAC2 | 0.016 |
| Achromatopsia (no color) | #B0B0B0 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C4BF
#21C4BF
oklch(74.3% 0.123 191.5)
- #EE8A98
#EE8A98
oklch(74.4% 0.122 11.5)
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 #21C4BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.031
- Dark Turquoise #00CED1 ΔE 0.032
- Medium Turquoise #48D1CC ΔE 0.044
- Light Sea Green #20B2AA ΔE 0.053
- Medium Aquamarine #66CDAA ΔE 0.058
- Turquoise Blue #06B1C4 ΔE 0.059
- Greeny Blue #42B395 ΔE 0.064
- Pale Teal #82CBB2 ΔE 0.070
Use #21C4BF 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.