#04555B
Closest named color: Deep Teal (#00555A). oklch(41% 0.069 203.3), rgb(4, 85, 91).
Aa
White text reads best on this color (8.55:1).
About this color
#04555B is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.069 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Teal (#00555A), ΔE 0.002 away. White text reads best on it, at 8.55:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Deep Teal (#00555A) |
| Black text | 2.45:1 |
| White text | 8.55:1 |
Values
| HEX | #04555B |
| RGB | rgb(4, 85, 91) |
| HSL | hsl(184, 92%, 19%) |
| OKLCH | oklch(41% 0.069 203.3) |
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 #04555B | 8.55:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #04555B | 2.45:1 | Fails | Lc 15.0 | Dividers and decoration only |
| #04555B text on white | 8.55:1 | AAA | Lc 89.0 | Fine for body text |
| #04555B text on black | 2.45:1 | Fails | Lc -13.2 | 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
#F2F7F7
oklch(97.2% 0.005 197.1)
-
Step 100
100
#E1ECED
oklch(93.5% 0.012 203.5)
-
Step 200
200
#C9DEE0
oklch(88.6% 0.023 203.7)
-
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
#4398A0
oklch(63.1% 0.082 203.7)
-
Step 600
600
#19828B
oklch(55.6% 0.089 204)
-
Step 700
700
#046E76
oklch(49.1% 0.083 203.7)
-
Step 800
800 (this color)
#04555B
oklch(41% 0.069 203.3)
-
Step 900
900
#174A4E
oklch(37.7% 0.053 202.5)
-
Step 950
950
#0F2B2E
oklch(26.9% 0.034 204.8)
#04555B 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) | #4D515B | 0.068 |
| Deuteranopia (no green cones) | #42495B | 0.062 |
| Tritanopia (no blue cones) | #005957 | 0.017 |
| Achromatopsia (no color) | #4C4C4C | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04555B
#04555B
oklch(41% 0.069 203.3)
- #6B3B38
#6B3B38
oklch(41.1% 0.068 24.3)
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 #04555B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Teal #00555A ΔE 0.002
- Dark Blue Green #005249 ΔE 0.030
- Dark Teal #014D4E ΔE 0.030
- Dark Slate Gray #2F4F4F ΔE 0.032
- Petrol #005F6A ΔE 0.036
- Charcoal #264653 ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.052
- Dark Green Blue #1F6357 ΔE 0.053
Use #04555B 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.