#255663
Closest named color: Deep Teal (#00555A). oklch(42.5% 0.057 217.8), rgb(37, 86, 99).
Aa
White text reads best on this color (8.10:1).
About this color
#255663 is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.057 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Teal (#00555A), ΔE 0.027 away. White text reads best on it, at 8.10:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Deep Teal (#00555A) |
| Black text | 2.58:1 |
| White text | 8.10:1 |
Values
| HEX | #255663 |
| RGB | rgb(37, 86, 99) |
| HSL | hsl(193, 46%, 27%) |
| OKLCH | oklch(42.5% 0.057 217.8) |
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 #255663 | 8.10:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #255663 | 2.58:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #255663 text on white | 8.10:1 | AAA | Lc 87.9 | Fine for body text |
| #255663 text on black | 2.58:1 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3EBEE
oklch(93.5% 0.009 222.1)
-
Step 200
200
#CCDCE1
oklch(88.4% 0.019 218.4)
-
Step 300
300
#AAC6CF
oklch(80.9% 0.033 219.2)
-
Step 400
400
#7BA9B7
oklch(70.7% 0.053 218.6)
-
Step 500
500
#5794A5
oklch(63.2% 0.068 217.7)
-
Step 600
600
#3A7E90
oklch(55.7% 0.074 217.7)
-
Step 700
700
#2B6A7A
oklch(49% 0.068 217.3)
-
Step 800
800 (this color)
#255663
oklch(42.5% 0.057 217.8)
-
Step 900
900
#244751
oklch(37.6% 0.044 218.5)
-
Step 950
950
#162A2F
oklch(27% 0.027 215.5)
#255663 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) | #4E5464 | 0.050 |
| Deuteranopia (no green cones) | #444D63 | 0.043 |
| Tritanopia (no blue cones) | #005B5A | 0.032 |
| Achromatopsia (no color) | #505050 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255663
#255663
oklch(42.5% 0.057 217.8)
- #6A4338
#6A4338
oklch(42.5% 0.058 36.5)
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 #255663, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Teal #00555A ΔE 0.027
- Petrol #005F6A ΔE 0.030
- Dark Slate Gray #2F4F4F ΔE 0.034
- YInMn Blue #415A77 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.050
- Dark Teal #014D4E ΔE 0.050
- Dark Blue Green #005249 ΔE 0.052
- Charcoal #264653 ΔE 0.052
Use #255663 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.