#17819E
Closest named color: Teal Blue (#01889F). oklch(56.1% 0.098 222.2), rgb(23, 129, 158).
Aa
Black text reads best on this color (4.67:1).
About this color
#17819E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 56%, its chroma 0.098 and its hue 222°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.020 away. Black text reads best on it, at 4.67:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 4.67:1 |
| White text | 4.49:1 |
Values
| HEX | #17819E |
| RGB | rgb(23, 129, 158) |
| HSL | hsl(193, 75%, 35%) |
| OKLCH | oklch(56.1% 0.098 222.2) |
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 #17819E | 4.49:1 | AA large text | Lc -76.3 | Fine for body text |
| Black text on #17819E | 4.67:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #17819E text on white | 4.49:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #17819E text on black | 4.67:1 | AA | Lc -30.9 | 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
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C8DDE5
oklch(88.4% 0.025 222.6)
-
Step 300
300
#A2C8D5
oklch(81% 0.044 220.7)
-
Step 400
400
#6DABC0
oklch(70.7% 0.071 221.5)
-
Step 500
500
#4196B1
oklch(63.2% 0.09 222)
-
Step 600
600 (this color)
#17819E
oklch(56.1% 0.098 222.2)
-
Step 700
700
#006C86
oklch(49.3% 0.091 222.1)
-
Step 800
800
#0A586D
oklch(42.8% 0.076 222.3)
-
Step 900
900
#154858
oklch(37.6% 0.059 222.8)
-
Step 950
950
#0F2A34
oklch(26.9% 0.038 225.1)
#17819E 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) | #707E9F | 0.078 |
| Deuteranopia (no green cones) | #5F719E | 0.070 |
| Tritanopia (no blue cones) | #008A8A | 0.048 |
| Achromatopsia (no color) | #777777 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17819E
#17819E
oklch(56.1% 0.098 222.2)
- #A56045
#A56045
oklch(56.1% 0.099 41.9)
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 #17819E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.020
- Ocean #017B92 ΔE 0.025
- Cerulean #457B9D ΔE 0.031
- Blue NCS #118AB2 ΔE 0.036
- Nice Blue #107AB0 ΔE 0.040
- Sea Blue #047495 ΔE 0.040
- Stormy Blue #507B9C ΔE 0.041
- Dull Blue #49759C ΔE 0.044
Use #17819E 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.