#155F79
Closest named color: Petrol (#005F6A). oklch(45.5% 0.08 227), rgb(21, 95, 121).
Aa
White text reads best on this color (7.13:1).
About this color
#155F79 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 45%, its chroma 0.080 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.028 away. White text reads best on it, at 7.13:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.94:1 |
| White text | 7.13:1 |
Values
| HEX | #155F79 |
| RGB | rgb(21, 95, 121) |
| HSL | hsl(196, 70%, 28%) |
| OKLCH | oklch(45.5% 0.08 227) |
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 #155F79 | 7.13:1 | AAA | Lc -89.3 | Fine for body text |
| Black text on #155F79 | 2.94:1 | Fails | Lc 19.6 | Dividers and decoration only |
| #155F79 text on white | 7.13:1 | AAA | Lc 84.4 | Fine for body text |
| #155F79 text on black | 2.94:1 | Fails | Lc -17.6 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C8DDE7
oklch(88.5% 0.026 227.9)
-
Step 300
300
#A2C7D8
oklch(80.8% 0.046 227.5)
-
Step 400
400
#6CAAC5
oklch(70.6% 0.075 227.5)
-
Step 500
500
#3F95B6
oklch(63.1% 0.095 226.7)
-
Step 600
600
#0F7FA2
oklch(55.7% 0.104 226.5)
-
Step 700
700
#006B8A
oklch(49.2% 0.095 226.5)
-
Step 800
800 (this color)
#155F79
oklch(45.5% 0.08 227)
-
Step 900
900
#14485B
oklch(37.7% 0.062 226.7)
-
Step 950
950
#0E2A35
oklch(26.9% 0.039 226.8)
#155F79 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) | #515D7A | 0.059 |
| Deuteranopia (no green cones) | #445479 | 0.051 |
| Tritanopia (no blue cones) | #006668 | 0.042 |
| Achromatopsia (no color) | #585858 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155F79
#155F79
oklch(45.5% 0.08 227)
- #7B482E
#7B482E
oklch(45.6% 0.08 47)
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 #155F79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.028
- Light Navy Blue #2E5A88 ΔE 0.037
- YInMn Blue #415A77 ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.042
- Dark Aqua #05696B ΔE 0.045
- Peacock Blue #016795 ΔE 0.046
- Denim #3B638C ΔE 0.047
- Light Navy #155084 ΔE 0.054
Use #155F79 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.