#1B6571
Closest named color: Dark Aqua (#05696B). oklch(46.8% 0.072 210.8), rgb(27, 101, 113).
Aa
White text reads best on this color (6.67:1).
About this color
#1B6571 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 47%, its chroma 0.072 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.020 away. White text reads best on it, at 6.67:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.14:1 |
| White text | 6.67:1 |
Values
| HEX | #1B6571 |
| RGB | rgb(27, 101, 113) |
| HSL | hsl(188, 61%, 27%) |
| OKLCH | oklch(46.8% 0.072 210.8) |
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 #1B6571 | 6.67:1 | AA | Lc -87.7 | Fine for body text |
| Black text on #1B6571 | 3.14:1 | AA large text | Lc 21.4 | Dividers and decoration only |
| #1B6571 text on white | 6.67:1 | AA | Lc 82.7 | Fine for body text |
| #1B6571 text on black | 3.14:1 | AA large text | Lc -19.3 | 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 700.
-
Step 50
50
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECEE
oklch(93.7% 0.01 212.5)
-
Step 200
200
#CBDDE0
oklch(88.5% 0.02 208.8)
-
Step 300
300
#A8C7CD
oklch(80.9% 0.034 210.7)
-
Step 400
400
#77AAB4
oklch(70.6% 0.056 211.1)
-
Step 500
500
#5295A2
oklch(63.1% 0.071 211.6)
-
Step 600
600
#327F8D
oklch(55.5% 0.077 211.6)
-
Step 700
700 (this color)
#1B6571
oklch(46.8% 0.072 210.8)
-
Step 800
800
#205861
oklch(42.8% 0.059 209.8)
-
Step 900
900
#20484F
oklch(37.6% 0.046 210.4)
-
Step 950
950
#142A2F
oklch(26.9% 0.029 214)
#1B6571 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) | #5B6172 | 0.067 |
| Deuteranopia (no green cones) | #4F5871 | 0.062 |
| Tritanopia (no blue cones) | #006A69 | 0.025 |
| Achromatopsia (no color) | #5C5C5C | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B6571
#1B6571
oklch(46.8% 0.072 210.8)
- #7E4A41
#7E4A41
oklch(46.8% 0.073 30.6)
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 #1B6571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.020
- Petrol #005F6A ΔE 0.025
- Dark Green Blue #1F6357 ΔE 0.041
- Deep Turquoise #017374 ΔE 0.043
- Dark Aquamarine #017371 ΔE 0.044
- YInMn Blue #415A77 ΔE 0.049
- Slate #516572 ΔE 0.053
- Denim #3B638C ΔE 0.056
Use #1B6571 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.