#31504B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.5% 0.038 183.1), rgb(49, 80, 75).
Aa
White text reads best on this color (8.82:1).
About this color
#31504B is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.038 and its hue 183°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.009 away. White text reads best on it, at 8.82:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.37:1 |
| White text | 8.82:1 |
Values
| HEX | #31504B |
| RGB | rgb(49, 80, 75) |
| HSL | hsl(170, 24%, 25%) |
| OKLCH | oklch(40.5% 0.038 183.1) |
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 #31504B | 8.82:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #31504B | 2.37:1 | Fails | Lc 13.8 | Not readable |
| #31504B text on white | 8.82:1 | AAA | Lc 90.1 | Preferred for body text |
| #31504B text on black | 2.37:1 | Fails | Lc -12.2 | 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E5EBEA
oklch(93.5% 0.007 185.3)
-
Step 200
200
#D1DCDA
oklch(88.6% 0.012 184)
-
Step 300
300
#B2C6C2
oklch(81% 0.022 182.4)
-
Step 400
400
#89A8A3
oklch(70.7% 0.035 184.5)
-
Step 500
500
#6B938C
oklch(63.2% 0.045 182.8)
-
Step 600
600
#527D76
oklch(55.6% 0.049 183.2)
-
Step 700
700
#426963
oklch(49% 0.045 183.7)
-
Step 800
800 (this color)
#31504B
oklch(40.5% 0.038 183.1)
-
Step 900
900
#304743
oklch(37.8% 0.029 182.7)
-
Step 950
950
#1C2A27
oklch(27.1% 0.02 180)
#31504B 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) | #4D4D4B | 0.040 |
| Deuteranopia (no green cones) | #48494B | 0.037 |
| Tritanopia (no blue cones) | #26514E | 0.012 |
| Achromatopsia (no color) | #4A4A4A | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31504B
#31504B
oklch(40.5% 0.038 183.1)
- #5B4147
#5B4147
oklch(40.6% 0.037 3.6)
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 #31504B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.009
- Dark Blue Green #005249 ΔE 0.035
- Deep Teal #00555A ΔE 0.036
- Dark Teal #014D4E ΔE 0.038
- Charcoal #264653 ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.050
- Dark Green Blue #1F6357 ΔE 0.058
Use #31504B 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.