#1B596F
Closest named color: Petrol (#005F6A). oklch(43.5% 0.071 225.9), rgb(27, 89, 111).
Aa
White text reads best on this color (7.76:1).
About this color
#1B596F is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 44%, its chroma 0.071 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.025 away. White text reads best on it, at 7.76:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.70:1 |
| White text | 7.76:1 |
Values
| HEX | #1B596F |
| RGB | rgb(27, 89, 111) |
| HSL | hsl(196, 61%, 27%) |
| OKLCH | oklch(43.5% 0.071 225.9) |
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 #1B596F | 7.76:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #1B596F | 2.70:1 | Fails | Lc 17.3 | Dividers and decoration only |
| #1B596F text on white | 7.76:1 | AAA | Lc 86.7 | Fine for body text |
| #1B596F text on black | 2.70:1 | Fails | Lc -15.4 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADDE5
oklch(88.6% 0.023 224.9)
-
Step 300
300
#A5C7D5
oklch(80.9% 0.041 224.8)
-
Step 400
400
#73AAC0
oklch(70.8% 0.066 225)
-
Step 500
500
#4A94B1
oklch(63.1% 0.085 226.2)
-
Step 600
600
#277E9C
oklch(55.6% 0.092 225.5)
-
Step 700
700
#186A86
oklch(49.1% 0.086 226.4)
-
Step 800
800 (this color)
#1B596F
oklch(43.5% 0.071 225.9)
-
Step 900
900
#1C4858
oklch(37.8% 0.055 225.1)
-
Step 950
950
#122A34
oklch(27.1% 0.035 227.4)
#1B596F 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) | #4D5770 | 0.054 |
| Deuteranopia (no green cones) | #424F6F | 0.047 |
| Tritanopia (no blue cones) | #005F60 | 0.038 |
| Achromatopsia (no color) | #525252 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B596F
#1B596F
oklch(43.5% 0.071 225.9)
- #71442F
#71442F
oklch(43.5% 0.07 45.4)
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 #1B596F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.025
- Deep Teal #00555A ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.040
- YInMn Blue #415A77 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.046
- Light Navy #155084 ΔE 0.051
- Dark Aqua #05696B ΔE 0.054
- Dark Slate Gray #2F4F4F ΔE 0.054
Use #1B596F 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.