#21535B
Closest named color: Deep Teal (#00555A). oklch(41.2% 0.055 209.5), rgb(33, 83, 91).
Aa
White text reads best on this color (8.56:1).
About this color
#21535B is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.055 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Teal (#00555A), ΔE 0.017 away. White text reads best on it, at 8.56:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Deep Teal (#00555A) |
| Black text | 2.45:1 |
| White text | 8.56:1 |
Values
| HEX | #21535B |
| RGB | rgb(33, 83, 91) |
| HSL | hsl(188, 47%, 24%) |
| OKLCH | oklch(41.2% 0.055 209.5) |
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 #21535B | 8.56:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #21535B | 2.45:1 | Fails | Lc 14.7 | Not readable |
| #21535B text on white | 8.56:1 | AAA | Lc 89.2 | Fine for body text |
| #21535B text on black | 2.45:1 | Fails | Lc -13.0 | Not readable |
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 800.
-
Step 50
50
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CCDDDF
oklch(88.5% 0.018 205.3)
-
Step 300
300
#AAC7CC
oklch(81% 0.032 209.2)
-
Step 400
400
#7BAAB2
oklch(70.7% 0.051 209.1)
-
Step 500
500
#57959F
oklch(63.2% 0.066 208.8)
-
Step 600
600
#3A7F8A
oklch(55.7% 0.071 209.2)
-
Step 700
700
#2B6B75
oklch(49.1% 0.066 209.2)
-
Step 800
800 (this color)
#21535B
oklch(41.2% 0.055 209.5)
-
Step 900
900
#24484E
oklch(37.7% 0.043 209.4)
-
Step 950
950
#162A2E
oklch(27% 0.027 211.7)
#21535B 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) | #4C505C | 0.052 |
| Deuteranopia (no green cones) | #43495B | 0.048 |
| Tritanopia (no blue cones) | #005755 | 0.025 |
| Achromatopsia (no color) | #4C4C4C | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21535B
#21535B
oklch(41.2% 0.055 209.5)
- #653F39
#653F39
oklch(41% 0.055 29.4)
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 #21535B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Teal #00555A ΔE 0.017
- Dark Slate Gray #2F4F4F ΔE 0.022
- Dark Teal #014D4E ΔE 0.035
- Dark Blue Green #005249 ΔE 0.038
- Petrol #005F6A ΔE 0.039
- Charcoal #264653 ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.042
- Dark Green Blue #1F6357 ΔE 0.055
Use #21535B 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.