#37575D
Closest named color: Dark Slate Gray (#2F4F4F). oklch(43.4% 0.039 210.6), rgb(55, 87, 93).
Aa
White text reads best on this color (7.82:1).
About this color
#37575D is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.039 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.033 away. White text reads best on it, at 7.82:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.68:1 |
| White text | 7.82:1 |
Values
| HEX | #37575D |
| RGB | rgb(55, 87, 93) |
| HSL | hsl(189, 26%, 29%) |
| OKLCH | oklch(43.4% 0.039 210.6) |
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 #37575D | 7.82:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #37575D | 2.68:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #37575D text on white | 7.82:1 | AAA | Lc 87.1 | Fine for body text |
| #37575D text on black | 2.68:1 | Fails | Lc -15.0 | 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 800.
-
Step 50
50
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#D0DBDE
oklch(88.4% 0.013 215.8)
-
Step 300
300
#B1C5C9
oklch(81% 0.023 211.1)
-
Step 400
400
#87A7AD
oklch(70.6% 0.036 210.3)
-
Step 500
500
#699199
oklch(63% 0.046 211.3)
-
Step 600
600
#4F7C84
oklch(55.7% 0.051 209.9)
-
Step 700
700
#406870
oklch(49.1% 0.047 211.7)
-
Step 800
800 (this color)
#37575D
oklch(43.4% 0.039 210.6)
-
Step 900
900
#2E464B
oklch(37.7% 0.031 212.1)
-
Step 950
950
#1B292C
oklch(27% 0.02 212.4)
#37575D 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) | #52555D | 0.037 |
| Deuteranopia (no green cones) | #4B505D | 0.033 |
| Tritanopia (no blue cones) | #285A59 | 0.020 |
| Achromatopsia (no color) | #525252 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37575D
#37575D
oklch(43.4% 0.039 210.6)
- #654944
#654944
oklch(43.4% 0.039 30.2)
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 #37575D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.033
- Petrol #005F6A ΔE 0.039
- Deep Teal #00555A ΔE 0.041
- YInMn Blue #415A77 ΔE 0.046
- Dark Green Blue #1F6357 ΔE 0.047
- Dark Aqua #05696B ΔE 0.057
- Dark Blue Green #005249 ΔE 0.058
- Dark Grey Blue #29465B ΔE 0.060
Use #37575D 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.