#21575C
Closest named color: Deep Teal (#00555A). oklch(42.3% 0.057 203.6), rgb(33, 87, 92).
Aa
White text reads best on this color (8.13:1).
About this color
#21575C is a dark, muted teal or cyan. In OKLCH its lightness is 42%, its chroma 0.057 and its hue 204°. 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 8.13:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Deep Teal (#00555A) |
| Black text | 2.58:1 |
| White text | 8.13:1 |
Values
| HEX | #21575C |
| RGB | rgb(33, 87, 92) |
| HSL | hsl(185, 47%, 25%) |
| OKLCH | oklch(42.3% 0.057 203.6) |
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 #21575C | 8.13:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #21575C | 2.58:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #21575C text on white | 8.13:1 | AAA | Lc 87.9 | Fine for body text |
| #21575C text on black | 2.58:1 | Fails | Lc -14.2 | 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
#A9C7CA
oklch(80.8% 0.033 203.9)
-
Step 400
400
#79ABB0
oklch(70.8% 0.053 203.8)
-
Step 500
500
#54969C
oklch(63.2% 0.068 203.2)
-
Step 600
600
#358087
oklch(55.6% 0.074 203.7)
-
Step 700
700
#276C72
oklch(49.1% 0.068 203.2)
-
Step 800
800 (this color)
#21575C
oklch(42.3% 0.057 203.6)
-
Step 900
900
#22494C
oklch(37.8% 0.044 202.1)
-
Step 950
950
#152B2D
oklch(27.2% 0.028 203.2)
#21575C 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) | #50535C | 0.056 |
| Deuteranopia (no green cones) | #474D5C | 0.051 |
| Tritanopia (no blue cones) | #005A58 | 0.020 |
| Achromatopsia (no color) | #4F4F4F | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21575C
#21575C
oklch(42.3% 0.057 203.6)
- #6A413F
#6A413F
oklch(42.3% 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 #21575C, 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 0.029
- Dark Blue Green #005249 ΔE 0.040
- Dark Green Blue #1F6357 ΔE 0.043
- Dark Teal #014D4E ΔE 0.044
- Charcoal #264653 ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.055
Use #21575C 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.