#18789B
Closest named color: Sea Blue (#047495). oklch(53.7% 0.099 228.7), rgb(24, 120, 155).
Aa
White text reads best on this color (5.00:1).
About this color
#18789B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 54%, its chroma 0.099 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.016 away. White text reads best on it, at 5.00:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #18789B |
| RGB | rgb(24, 120, 155) |
| HSL | hsl(196, 73%, 35%) |
| OKLCH | oklch(53.7% 0.099 228.7) |
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 #18789B | 5.00:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #18789B | 4.19:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #18789B text on white | 5.00:1 | AA | Lc 74.2 | Content text, not long reading |
| #18789B text on black | 4.19:1 | AA large text | Lc -27.5 | Dividers and decoration only |
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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF1
oklch(93.7% 0.013 228.9)
-
Step 200
200
#C9DDE6
oklch(88.5% 0.025 226.5)
-
Step 300
300
#A4C7D8
oklch(81% 0.044 228.9)
-
Step 400
400
#70AAC4
oklch(70.8% 0.071 228)
-
Step 500
500
#4794B5
oklch(63.1% 0.09 228.7)
-
Step 600
600 (this color)
#18789B
oklch(53.7% 0.099 228.7)
-
Step 700
700
#106A8A
oklch(49.1% 0.092 228.8)
-
Step 800
800
#135670
oklch(42.6% 0.076 229.4)
-
Step 900
900
#19475A
oklch(37.5% 0.059 228.7)
-
Step 950
950
#102A35
oklch(27% 0.038 228.2)
#18789B 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) | #66769D | 0.070 |
| Deuteranopia (no green cones) | #556A9B | 0.060 |
| Tritanopia (no blue cones) | #008284 | 0.055 |
| Achromatopsia (no color) | #6F6F6F | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18789B
#18789B
oklch(53.7% 0.099 228.7)
- #9B5B37
#9B5B37
oklch(53.7% 0.098 49)
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 #18789B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.016
- Ocean #017B92 ΔE 0.020
- Ocean Blue #03719C ΔE 0.024
- Muted Blue #3B719F ΔE 0.030
- Nice Blue #107AB0 ΔE 0.033
- Cerulean #457B9D ΔE 0.034
- Dull Blue #49759C ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.037
Use #18789B 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.