#17818F
Closest named color: Ocean (#017B92). oklch(55.4% 0.09 208.9), rgb(23, 129, 143).
Aa
White text reads best on this color (4.59:1).
About this color
#17818F is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 55%, its chroma 0.090 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean (#017B92), ΔE 0.022 away. White text reads best on it, at 4.59:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Ocean (#017B92) |
| Black text | 4.57:1 |
| White text | 4.59:1 |
Values
| HEX | #17818F |
| RGB | rgb(23, 129, 143) |
| HSL | hsl(187, 72%, 33%) |
| OKLCH | oklch(55.4% 0.09 208.9) |
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 #17818F | 4.59:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #17818F | 4.57:1 | AA | Lc 32.6 | Non-text elements, placeholder text |
| #17818F text on white | 4.59:1 | AA | Lc 71.5 | Content text, not long reading |
| #17818F text on black | 4.57:1 | AA | Lc -30.2 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F1F6F7
oklch(97% 0.005 211)
-
Step 100
100
#E1ECEE
oklch(93.5% 0.012 209.8)
-
Step 200
200
#C9DEE1
oklch(88.6% 0.023 207.1)
-
Step 300
300
#A3C8CF
oklch(80.8% 0.041 210.4)
-
Step 400
400
#6FACB6
oklch(70.7% 0.065 208.9)
-
Step 500
500
#4397A4
oklch(63% 0.083 209)
-
Step 600
600 (this color)
#17818F
oklch(55.4% 0.09 208.9)
-
Step 700
700
#036D7A
oklch(49% 0.084 209.2)
-
Step 800
800
#0D5963
oklch(42.6% 0.069 208.8)
-
Step 900
900
#174951
oklch(37.6% 0.054 209.9)
-
Step 950
950
#0F2B2F
oklch(26.9% 0.034 207.9)
#17818F 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) | #747C90 | 0.085 |
| Deuteranopia (no green cones) | #65708F | 0.079 |
| Tritanopia (no blue cones) | #008785 | 0.028 |
| Achromatopsia (no color) | #757575 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17818F
#17818F
oklch(55.4% 0.09 208.9)
- #A15D54
#A15D54
oklch(55.4% 0.091 28.4)
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 #17818F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean #017B92 ΔE 0.022
- Teal #008080 ΔE 0.025
- Teal Blue #01889F ΔE 0.028
- Dark Cyan #008B8B ΔE 0.033
- Deep Aqua #08787F ΔE 0.034
- Bluegreen #017A79 ΔE 0.038
- Cerulean #457B9D ΔE 0.044
- Sea Blue #047495 ΔE 0.045
Use #17818F 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.