#178FA1
Closest named color: Teal Blue (#01889F). oklch(59.8% 0.099 211), rgb(23, 143, 161).
Aa
Black text reads best on this color (5.48:1).
About this color
#178FA1 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 60%, its chroma 0.099 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.022 away. Black text reads best on it, at 5.48:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 5.48:1 |
| White text | 3.83:1 |
Values
| HEX | #178FA1 |
| RGB | rgb(23, 143, 161) |
| HSL | hsl(188, 75%, 36%) |
| OKLCH | oklch(59.8% 0.099 211) |
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 #178FA1 | 3.83:1 | AA large text | Lc -70.9 | Content text, not long reading |
| Black text on #178FA1 | 5.48:1 | AA | Lc 38.7 | Non-text elements, placeholder text |
| #178FA1 text on white | 3.83:1 | AA large text | Lc 65.4 | Content text, not long reading |
| #178FA1 text on black | 5.48:1 | AA | Lc -36.3 | 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 500.
-
Step 50
50
#F1F7F8
oklch(97.2% 0.007 208.8)
-
Step 100
100
#E0EDEF
oklch(93.7% 0.014 207.9)
-
Step 200
200
#C6DEE3
oklch(88.4% 0.026 211.6)
-
Step 300
300
#9DCAD2
oklch(81% 0.049 209.6)
-
Step 400
400
#62AEBC
oklch(70.7% 0.078 210.8)
-
Step 500
500 (this color)
#178FA1
oklch(59.8% 0.099 211)
-
Step 600
600
#008293
oklch(55.6% 0.096 210.7)
-
Step 700
700
#006D7C
oklch(49% 0.085 211.2)
-
Step 800
800
#005966
oklch(42.6% 0.074 211.8)
-
Step 900
900
#024A55
oklch(37.6% 0.065 211.8)
-
Step 950
950
#082C32
oklch(27.1% 0.041 210.9)
#178FA1 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) | #808AA2 | 0.092 |
| Deuteranopia (no green cones) | #6F7DA1 | 0.084 |
| Tritanopia (no blue cones) | #009794 | 0.036 |
| Achromatopsia (no color) | #828282 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178FA1
#178FA1
oklch(59.8% 0.099 211)
- #B3685B
#B3685B
oklch(59.8% 0.099 30.7)
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 #178FA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.022
- Teal Green #0A9396 ΔE 0.024
- Blue NCS #118AB2 ΔE 0.034
- Dark Cyan #008B8B ΔE 0.035
- Sea #3C9992 ΔE 0.048
- Dusty Teal #4C9085 ΔE 0.051
- Blue Green #0F9B8E ΔE 0.053
- Dusty Blue #5A86AD ΔE 0.058
Use #178FA1 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.