#17859B
Closest named color: Teal Blue (#01889F). oklch(57% 0.096 215.7), rgb(23, 133, 155).
Aa
Black text reads best on this color (4.86:1).
About this color
#17859B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 57%, its chroma 0.096 and its hue 216°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.009 away. Black text reads best on it, at 4.86:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 4.86:1 |
| White text | 4.31:1 |
Values
| HEX | #17859B |
| RGB | rgb(23, 133, 155) |
| HSL | hsl(190, 74%, 35%) |
| OKLCH | oklch(57% 0.096 215.7) |
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 #17859B | 4.31:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #17859B | 4.86:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #17859B text on white | 4.31:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #17859B text on black | 4.86:1 | AA | Lc -32.2 | 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
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECEF
oklch(93.6% 0.012 215.8)
-
Step 200
200
#C8DDE3
oklch(88.4% 0.024 216.7)
-
Step 300
300
#A2C8D2
oklch(80.9% 0.043 215.5)
-
Step 400
400
#6CACBC
oklch(70.7% 0.069 215.4)
-
Step 500
500
#3F97AB
oklch(63.1% 0.088 215.2)
-
Step 600
600 (this color)
#17859B
oklch(57% 0.096 215.7)
-
Step 700
700
#006D80
oklch(49.2% 0.087 215.3)
-
Step 800
800
#065969
oklch(42.8% 0.074 215.9)
-
Step 900
900
#144955
oklch(37.7% 0.058 216)
-
Step 950
950
#0E2B32
oklch(27.1% 0.037 216.1)
#17859B 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) | #76819C | 0.084 |
| Deuteranopia (no green cones) | #65749B | 0.077 |
| Tritanopia (no blue cones) | #008D8C | 0.039 |
| Achromatopsia (no color) | #7A7A7A | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17859B
#17859B
oklch(57% 0.096 215.7)
- #A8624F
#A8624F
oklch(57.1% 0.096 36)
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 #17859B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.009
- Ocean #017B92 ΔE 0.032
- Blue NCS #118AB2 ΔE 0.035
- Dark Cyan #008B8B ΔE 0.036
- Cerulean #457B9D ΔE 0.039
- Teal #008080 ΔE 0.043
- Teal Green #0A9396 ΔE 0.045
- Stormy Blue #507B9C ΔE 0.046
Use #17859B 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.