#18555E
Closest named color: Deep Teal (#00555A). oklch(41.6% 0.062 209.1), rgb(24, 85, 94).
Aa
White text reads best on this color (8.40:1).
About this color
#18555E is a dark, muted teal or cyan. In OKLCH its lightness is 42%, its chroma 0.062 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Teal (#00555A), ΔE 0.013 away. White text reads best on it, at 8.40:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Deep Teal (#00555A) |
| Black text | 2.49:1 |
| White text | 8.40:1 |
Values
| HEX | #18555E |
| RGB | rgb(24, 85, 94) |
| HSL | hsl(188, 59%, 23%) |
| OKLCH | oklch(41.6% 0.062 209.1) |
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 #18555E | 8.40:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #18555E | 2.49:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #18555E text on white | 8.40:1 | AAA | Lc 88.7 | Fine for body text |
| #18555E text on black | 2.49:1 | Fails | Lc -13.5 | 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
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#CBDDE0
oklch(88.5% 0.02 208.8)
-
Step 300
300
#A7C8CD
oklch(81% 0.036 207.7)
-
Step 400
400
#75ABB4
oklch(70.7% 0.058 209)
-
Step 500
500
#4E96A2
oklch(63.1% 0.074 209.5)
-
Step 600
600
#2D808D
oklch(55.6% 0.08 209.7)
-
Step 700
700
#1E6C78
oklch(49.1% 0.075 209.9)
-
Step 800
800 (this color)
#18555E
oklch(41.6% 0.062 209.1)
-
Step 900
900
#1E494F
oklch(37.8% 0.048 207.6)
-
Step 950
950
#132B2E
oklch(27.1% 0.03 206.1)
#18555E 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) | #4D525F | 0.059 |
| Deuteranopia (no green cones) | #434A5E | 0.054 |
| Tritanopia (no blue cones) | #005958 | 0.021 |
| Achromatopsia (no color) | #4D4D4D | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18555E
#18555E
oklch(41.6% 0.062 209.1)
- #6A3F38
#6A3F38
oklch(41.7% 0.062 29.9)
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 #18555E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Teal #00555A ΔE 0.013
- Dark Slate Gray #2F4F4F ΔE 0.029
- Petrol #005F6A ΔE 0.032
- Dark Teal #014D4E ΔE 0.037
- Dark Blue Green #005249 ΔE 0.039
- Charcoal #264653 ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.048
- Dark Green Blue #1F6357 ΔE 0.052
Use #18555E 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.