#21888F
Closest named color: Dark Cyan (#008B8B). oklch(57.4% 0.089 201.9), rgb(33, 136, 143).
Aa
Black text reads best on this color (4.98:1).
About this color
#21888F is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 57%, its chroma 0.089 and its hue 202°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.015 away. Black text reads best on it, at 4.98:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #21888F |
| RGB | rgb(33, 136, 143) |
| HSL | hsl(184, 63%, 35%) |
| OKLCH | oklch(57.4% 0.089 201.9) |
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 #21888F | 4.21:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #21888F | 4.98:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #21888F text on white | 4.21:1 | AA large text | Lc 68.7 | Content text, not long reading |
| #21888F text on black | 4.98:1 | AA | Lc -33.0 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F1F7F7
oklch(97.2% 0.006 197.1)
-
Step 100
100
#E1ECED
oklch(93.5% 0.012 203.5)
-
Step 200
200
#C9DEDF
oklch(88.5% 0.022 200.2)
-
Step 300
300
#A3C9CC
oklch(80.9% 0.041 202.3)
-
Step 400
400
#6FADB2
oklch(70.7% 0.064 202.3)
-
Step 500
500
#43989F
oklch(63.1% 0.082 202.7)
-
Step 600
600 (this color)
#21888F
oklch(57.4% 0.089 201.9)
-
Step 700
700
#026E75
oklch(49% 0.083 202.6)
-
Step 800
800
#0D5A5F
oklch(42.7% 0.069 201.8)
-
Step 900
900
#174A4E
oklch(37.7% 0.053 202.5)
-
Step 950
950
#0F2B2D
oklch(26.9% 0.034 201.6)
#21888F 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) | #7D8290 | 0.090 |
| Deuteranopia (no green cones) | #6E778F | 0.082 |
| Tritanopia (no blue cones) | #008E8A | 0.023 |
| Achromatopsia (no color) | #7B7B7B | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21888F
#21888F
oklch(57.4% 0.089 201.9)
- #A76361
#A76361
oklch(57.5% 0.089 22)
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 #21888F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.015
- Teal Blue #01889F ΔE 0.026
- Teal Green #0A9396 ΔE 0.031
- Teal #008080 ΔE 0.033
- Ocean #017B92 ΔE 0.044
- Dusty Teal #4C9085 ΔE 0.045
- Bluegreen #017A79 ΔE 0.051
- Deep Aqua #08787F ΔE 0.052
Use #21888F 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.