#374F4B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.7% 0.03 183.4), rgb(55, 79, 75).
Aa
White text reads best on this color (8.81:1).
About this color
#374F4B is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.030 and its hue 183°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.011 away. White text reads best on it, at 8.81:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.38:1 |
| White text | 8.81:1 |
Values
| HEX | #374F4B |
| RGB | rgb(55, 79, 75) |
| HSL | hsl(170, 18%, 26%) |
| OKLCH | oklch(40.7% 0.03 183.4) |
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 #374F4B | 8.81:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #374F4B | 2.38:1 | Fails | Lc 13.8 | Not readable |
| #374F4B text on white | 8.81:1 | AAA | Lc 90.1 | Preferred for body text |
| #374F4B text on black | 2.38:1 | Fails | Lc -12.1 | 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E6EBEA
oklch(93.6% 0.006 183)
-
Step 200
200
#D2DBDA
oklch(88.4% 0.01 189)
-
Step 300
300
#B5C4C2
oklch(80.8% 0.017 187.2)
-
Step 400
400
#8EA7A2
oklch(70.8% 0.029 182)
-
Step 500
500
#72918C
oklch(63.2% 0.036 184.3)
-
Step 600
600
#5A7B75
oklch(55.6% 0.039 182.4)
-
Step 700
700
#496863
oklch(49.2% 0.037 183.7)
-
Step 800
800 (this color)
#374F4B
oklch(40.7% 0.03 183.4)
-
Step 900
900
#344643
oklch(37.8% 0.023 183.7)
-
Step 950
950
#1E2927
oklch(27% 0.016 182.8)
#374F4B 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) | #4D4C4B | 0.033 |
| Deuteranopia (no green cones) | #48494B | 0.030 |
| Tritanopia (no blue cones) | #30504E | 0.009 |
| Achromatopsia (no color) | #4A4A4A | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374F4B
#374F4B
oklch(40.7% 0.03 183.4)
- #584348
#584348
oklch(40.7% 0.03 2.6)
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 #374F4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.011
- Deep Teal #00555A ΔE 0.042
- Dark Blue Green #005249 ΔE 0.042
- Charcoal Grey #3C4142 ΔE 0.043
- Charcoal #264653 ΔE 0.043
- Dark Teal #014D4E ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.050
- Dark Green Blue #1F6357 ΔE 0.062
Use #374F4B 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.