#21A7C5
Closest named color: Turquoise Blue (#06B1C4). oklch(67.4% 0.114 217.8), rgb(33, 167, 197).
Aa
Black text reads best on this color (7.39:1).
About this color
#21A7C5 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 67%, its chroma 0.114 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.029 away. Black text reads best on it, at 7.39:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.39:1 |
| White text | 2.83:1 |
Values
| HEX | #21A7C5 |
| RGB | rgb(33, 167, 197) |
| HSL | hsl(191, 71%, 45%) |
| OKLCH | oklch(67.4% 0.114 217.8) |
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 #21A7C5 | 2.83:1 | Fails | Lc -59.2 | Large or bold text, headings |
| Black text on #21A7C5 | 7.39:1 | AAA | Lc 50.1 | Large or bold text, headings |
| #21A7C5 text on white | 2.83:1 | Fails | Lc 54.0 | Large or bold text, headings |
| #21A7C5 text on black | 7.39:1 | AAA | Lc -47.9 | 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
#EFF7FA
oklch(97.1% 0.009 222.1)
-
Step 100
100
#DBEEF3
oklch(93.7% 0.021 215.3)
-
Step 200
200
#BDE0EB
oklch(88.5% 0.04 218.8)
-
Step 300
300
#8BCCDF
oklch(80.8% 0.071 218.1)
-
Step 400
400 (this color)
#21A7C5
oklch(67.4% 0.114 217.8)
-
Step 500
500
#0099B7
oklch(63.1% 0.114 218.3)
-
Step 600
600
#00819A
oklch(55.7% 0.1 217.7)
-
Step 700
700
#006C82
oklch(49.1% 0.088 218.4)
-
Step 800
800
#00596B
oklch(42.8% 0.077 217.7)
-
Step 900
900
#004A59
oklch(37.7% 0.067 217.2)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#21A7C5 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) | #94A2C7 | 0.099 |
| Deuteranopia (no green cones) | #7F93C5 | 0.088 |
| Tritanopia (no blue cones) | #00B1B1 | 0.048 |
| Achromatopsia (no color) | #999999 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21A7C5
#21A7C5
oklch(67.4% 0.114 217.8)
- #D27C62
#D27C62
oklch(67.4% 0.114 37.6)
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 #21A7C5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.029
- Light Sea Green #20B2AA ΔE 0.059
- Cadet Blue #5F9EA0 ΔE 0.060
- Greyblue #77A1B5 ΔE 0.063
- Sea #3C9992 ΔE 0.075
- Topaz #13BBAF ΔE 0.075
- Persian Green #2A9D8F ΔE 0.079
- Bluegrey #85A3B2 ΔE 0.079
Use #21A7C5 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.