#31575D
Closest named color: Dark Slate Gray (#2F4F4F). oklch(43.1% 0.044 208.6), rgb(49, 87, 93).
Aa
White text reads best on this color (7.91:1).
About this color
#31575D is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.044 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.030 away. White text reads best on it, at 7.91:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.65:1 |
| White text | 7.91:1 |
Values
| HEX | #31575D |
| RGB | rgb(49, 87, 93) |
| HSL | hsl(188, 31%, 28%) |
| OKLCH | oklch(43.1% 0.044 208.6) |
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 #31575D | 7.91:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #31575D | 2.65:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #31575D text on white | 7.91:1 | AAA | Lc 87.4 | Fine for body text |
| #31575D text on black | 2.65:1 | Fails | Lc -14.7 | Not readable |
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 800.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBEC
oklch(93.5% 0.008 207.1)
-
Step 200
200
#CFDCDE
oklch(88.5% 0.014 207.9)
-
Step 300
300
#AEC6C9
oklch(80.9% 0.026 205.8)
-
Step 400
400
#83A8AE
oklch(70.6% 0.041 208.5)
-
Step 500
500
#63939B
oklch(63.2% 0.053 209)
-
Step 600
600
#487D85
oklch(55.6% 0.058 208)
-
Step 700
700
#396971
oklch(49% 0.054 209.4)
-
Step 800
800 (this color)
#31575D
oklch(43.1% 0.044 208.6)
-
Step 900
900
#2B474B
oklch(37.7% 0.034 207.2)
-
Step 950
950
#1A2A2C
oklch(27.2% 0.022 205.8)
#31575D 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) | #51545D | 0.043 |
| Deuteranopia (no green cones) | #4A4F5D | 0.039 |
| Tritanopia (no blue cones) | #1C5A59 | 0.022 |
| Achromatopsia (no color) | #515151 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31575D
#31575D
oklch(43.1% 0.044 208.6)
- #664742
#664742
oklch(43.1% 0.044 29.2)
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 #31575D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.030
- Deep Teal #00555A ΔE 0.034
- Petrol #005F6A ΔE 0.035
- Dark Green Blue #1F6357 ΔE 0.045
- YInMn Blue #415A77 ΔE 0.049
- Dark Blue Green #005249 ΔE 0.052
- Dark Teal #014D4E ΔE 0.055
- Dark Aqua #05696B ΔE 0.056
Use #31575D 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.