#255B63
Closest named color: Petrol (#005F6A). oklch(43.9% 0.058 208.4), rgb(37, 91, 99).
Aa
White text reads best on this color (7.62:1).
About this color
#255B63 is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.058 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.019 away. White text reads best on it, at 7.62:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.75:1 |
| White text | 7.62:1 |
Values
| HEX | #255B63 |
| RGB | rgb(37, 91, 99) |
| HSL | hsl(188, 46%, 27%) |
| OKLCH | oklch(43.9% 0.058 208.4) |
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 #255B63 | 7.62:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #255B63 | 2.75:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #255B63 text on white | 7.62:1 | AAA | Lc 86.3 | Fine for body text |
| #255B63 text on black | 2.75:1 | Fails | Lc -15.8 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CCDDE0
oklch(88.6% 0.019 209.4)
-
Step 300
300
#A8C7CC
oklch(80.8% 0.034 208.4)
-
Step 400
400
#78AAB2
oklch(70.6% 0.054 208.4)
-
Step 500
500
#5395A0
oklch(63% 0.069 209.4)
-
Step 600
600
#34808B
oklch(55.7% 0.076 208.3)
-
Step 700
700
#266C76
oklch(49.2% 0.07 208.4)
-
Step 800
800 (this color)
#255B63
oklch(43.9% 0.058 208.4)
-
Step 900
900
#21484E
oklch(37.6% 0.045 208.6)
-
Step 950
950
#142A2E
oklch(26.9% 0.029 210.5)
#255B63 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) | #535864 | 0.055 |
| Deuteranopia (no green cones) | #4A5163 | 0.050 |
| Tritanopia (no blue cones) | #005F5D | 0.025 |
| Achromatopsia (no color) | #545454 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255B63
#255B63
oklch(43.9% 0.058 208.4)
- #6F4640
#6F4640
oklch(44% 0.058 28.7)
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 #255B63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.019
- Deep Teal #00555A ΔE 0.033
- Dark Green Blue #1F6357 ΔE 0.038
- Dark Slate Gray #2F4F4F ΔE 0.042
- Dark Aqua #05696B ΔE 0.043
- YInMn Blue #415A77 ΔE 0.048
- Dark Blue Green #005249 ΔE 0.055
- Dark Teal #014D4E ΔE 0.059
Use #255B63 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.