#257173
Closest named color: Deep Turquoise (#017374). oklch(50.4% 0.073 197.6), rgb(37, 113, 115).
Aa
White text reads best on this color (5.69:1).
About this color
#257173 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 50%, its chroma 0.073 and its hue 198°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Turquoise (#017374), ΔE 0.013 away. White text reads best on it, at 5.69:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Deep Turquoise (#017374) |
| Black text | 3.68:1 |
| White text | 5.69:1 |
Values
| HEX | #257173 |
| RGB | rgb(37, 113, 115) |
| HSL | hsl(182, 51%, 30%) |
| OKLCH | oklch(50.4% 0.073 197.6) |
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 #257173 | 5.69:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #257173 | 3.68:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #257173 text on white | 5.69:1 | AA | Lc 78.2 | Fine for body text |
| #257173 text on black | 3.68:1 | AA large text | Lc -23.6 | 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 700.
-
Step 50
50
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E3ECEC
oklch(93.6% 0.01 197)
-
Step 200
200
#CBDDDE
oklch(88.4% 0.019 200.8)
-
Step 300
300
#A7C8C9
oklch(80.9% 0.035 198.7)
-
Step 400
400
#76ACAD
oklch(70.7% 0.057 197.4)
-
Step 500
500
#509799
oklch(63.1% 0.072 197.9)
-
Step 600
600
#2F8183
oklch(55.5% 0.078 197.4)
-
Step 700
700 (this color)
#257173
oklch(50.4% 0.073 197.6)
-
Step 800
800
#1E595B
oklch(42.7% 0.06 198.3)
-
Step 900
900
#1F494A
oklch(37.6% 0.047 197.4)
-
Step 950
950
#132B2C
oklch(27% 0.03 199.1)
#257173 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) | #696C73 | 0.075 |
| Deuteranopia (no green cones) | #5D6373 | 0.069 |
| Tritanopia (no blue cones) | #007571 | 0.018 |
| Achromatopsia (no color) | #676767 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257173
#257173
oklch(50.4% 0.073 197.6)
- #895355
#895355
oklch(50.4% 0.072 17.6)
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 #257173, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Turquoise #017374 ΔE 0.013
- Dark Aquamarine #017371 ΔE 0.015
- Deep Aqua #08787F ΔE 0.024
- Bluegreen #017A79 ΔE 0.027
- Dark Aqua #05696B ΔE 0.032
- Teal #008080 ΔE 0.044
- Ocean #017B92 ΔE 0.050
- Slate #516572 ΔE 0.053
Use #257173 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.