#2A5757
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.5% 0.05 195.4), rgb(42, 87, 87).
Aa
White text reads best on this color (8.07:1).
About this color
#2A5757 is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.050 and its hue 195°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.025 away. White text reads best on it, at 8.07:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.59:1 |
| White text | 8.07:1 |
Values
| HEX | #2A5757 |
| RGB | rgb(42, 87, 87) |
| HSL | hsl(180, 35%, 25%) |
| OKLCH | oklch(42.5% 0.05 195.4) |
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 #2A5757 | 8.07:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #2A5757 | 2.59:1 | Fails | Lc 16.2 | Dividers and decoration only |
| #2A5757 text on white | 8.07:1 | AAA | Lc 87.8 | Fine for body text |
| #2A5757 text on black | 2.59:1 | Fails | Lc -14.3 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E4ECEB
oklch(93.7% 0.009 188.1)
-
Step 200
200
#CEDDDC
oklch(88.6% 0.016 192)
-
Step 300
300
#ACC7C6
oklch(80.9% 0.029 193.9)
-
Step 400
400
#7FAAAA
oklch(70.7% 0.046 196.2)
-
Step 500
500
#5D9595
oklch(63.1% 0.059 195.8)
-
Step 600
600
#417F7F
oklch(55.5% 0.064 195.5)
-
Step 700
700
#326B6B
oklch(49% 0.06 195.4)
-
Step 800
800 (this color)
#2A5757
oklch(42.5% 0.05 195.4)
-
Step 900
900
#274848
oklch(37.7% 0.039 195.6)
-
Step 950
950
#182A2A
oklch(26.9% 0.024 195.8)
#2A5757 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) | #525357 | 0.052 |
| Deuteranopia (no green cones) | #4A4D57 | 0.049 |
| Tritanopia (no blue cones) | #0F5957 | 0.019 |
| Achromatopsia (no color) | #505050 | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A5757
#2A5757
oklch(42.5% 0.05 195.4)
- #674345
#674345
oklch(42.5% 0.05 15.8)
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 #2A5757, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.025
- Deep Teal #00555A ΔE 0.026
- Petrol #005F6A ΔE 0.036
- Dark Green Blue #1F6357 ΔE 0.039
- Dark Blue Green #005249 ΔE 0.040
- Dark Teal #014D4E ΔE 0.046
- Charcoal #264653 ΔE 0.056
- Dark Aqua #05696B ΔE 0.056
Use #2A5757 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.