#21585C
Closest named color: Deep Teal (#00555A). oklch(42.6% 0.057 201.9), rgb(33, 88, 92).
Aa
White text reads best on this color (8.03:1).
About this color
#21585C is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.057 and its hue 202°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Teal (#00555A), ΔE 0.021 away. White text reads best on it, at 8.03:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Deep Teal (#00555A) |
| Black text | 2.61:1 |
| White text | 8.03:1 |
Values
| HEX | #21585C |
| RGB | rgb(33, 88, 92) |
| HSL | hsl(184, 47%, 25%) |
| OKLCH | oklch(42.6% 0.057 201.9) |
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 #21585C | 8.03:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #21585C | 2.61:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #21585C text on white | 8.03:1 | AAA | Lc 87.6 | Fine for body text |
| #21585C text on black | 2.61:1 | Fails | Lc -14.5 | 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
#E3ECEC
oklch(93.6% 0.01 197)
-
Step 200
200
#CCDDDE
oklch(88.5% 0.018 201.1)
-
Step 300
300
#A8C7CA
oklch(80.8% 0.034 203.7)
-
Step 400
400
#79ABAF
oklch(70.7% 0.053 202.3)
-
Step 500
500
#53969B
oklch(63.1% 0.069 201.8)
-
Step 600
600
#348086
oklch(55.5% 0.074 202.4)
-
Step 700
700
#266C71
oklch(49% 0.069 201.8)
-
Step 800
800 (this color)
#21585C
oklch(42.6% 0.057 201.9)
-
Step 900
900
#21494C
oklch(37.8% 0.045 201.9)
-
Step 950
950
#142B2C
oklch(27.1% 0.029 199.2)
#21585C 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) | #51545C | 0.057 |
| Deuteranopia (no green cones) | #484D5C | 0.054 |
| Tritanopia (no blue cones) | #005B59 | 0.019 |
| Achromatopsia (no color) | #505050 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21585C
#21585C
oklch(42.6% 0.057 201.9)
- #6B4240
#6B4240
oklch(42.6% 0.058 22.8)
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 #21585C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Teal #00555A ΔE 0.021
- Petrol #005F6A ΔE 0.028
- Dark Slate Gray #2F4F4F ΔE 0.031
- Dark Green Blue #1F6357 ΔE 0.040
- Dark Blue Green #005249 ΔE 0.041
- Dark Teal #014D4E ΔE 0.046
- Dark Aqua #05696B ΔE 0.052
- Charcoal #264653 ΔE 0.057
Use #21585C 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.