#21565E
Closest named color: Deep Teal (#00555A). oklch(42.1% 0.057 208.8), rgb(33, 86, 94).
Aa
White text reads best on this color (8.21:1).
About this color
#21565E is a dark, muted teal or cyan. In OKLCH its lightness is 42%, its chroma 0.057 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Teal (#00555A), ΔE 0.019 away. White text reads best on it, at 8.21:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Deep Teal (#00555A) |
| Black text | 2.55:1 |
| White text | 8.21:1 |
Values
| HEX | #21565E |
| RGB | rgb(33, 86, 94) |
| HSL | hsl(188, 48%, 25%) |
| OKLCH | oklch(42.1% 0.057 208.8) |
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 #21565E | 8.21:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #21565E | 2.55:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #21565E text on white | 8.21:1 | AAA | Lc 88.2 | Fine for body text |
| #21565E text on black | 2.55:1 | Fails | Lc -14.0 | 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
#CCDDE0
oklch(88.6% 0.019 209.4)
-
Step 300
300
#A9C7CC
oklch(80.9% 0.033 208.8)
-
Step 400
400
#79AAB2
oklch(70.6% 0.053 208.7)
-
Step 500
500
#54959F
oklch(63% 0.068 208.3)
-
Step 600
600
#367F8A
oklch(55.5% 0.074 208.7)
-
Step 700
700
#286B75
oklch(49% 0.068 208.8)
-
Step 800
800 (this color)
#21565E
oklch(42.1% 0.057 208.8)
-
Step 900
900
#22484E
oklch(37.6% 0.044 208.8)
-
Step 950
950
#152A2E
oklch(26.9% 0.028 211.1)
#21565E 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) | #4F535F | 0.055 |
| Deuteranopia (no green cones) | #454C5E | 0.049 |
| Tritanopia (no blue cones) | #005A58 | 0.024 |
| Achromatopsia (no color) | #4F4F4F | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21565E
#21565E
oklch(42.1% 0.057 208.8)
- #69413B
#69413B
oklch(42% 0.057 29)
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 #21565E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Teal #00555A ΔE 0.019
- Dark Slate Gray #2F4F4F ΔE 0.029
- Petrol #005F6A ΔE 0.030
- Dark Blue Green #005249 ΔE 0.042
- Dark Teal #014D4E ΔE 0.043
- Dark Green Blue #1F6357 ΔE 0.048
- Charcoal #264653 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.051
Use #21565E 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.