#155B5E
Closest named color: Petrol (#005F6A). oklch(43.1% 0.066 199.3), rgb(21, 91, 94).
Aa
White text reads best on this color (7.80:1).
About this color
#155B5E is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.066 and its hue 199°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.020 away. White text reads best on it, at 7.80:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.68:1 |
| White text | 7.80:1 |
Values
| HEX | #155B5E |
| RGB | rgb(21, 91, 94) |
| HSL | hsl(182, 63%, 23%) |
| OKLCH | oklch(43.1% 0.066 199.3) |
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 #155B5E | 7.80:1 | AAA | Lc -91.5 | Preferred for body text |
| Black text on #155B5E | 2.68:1 | Fails | Lc 17.2 | Dividers and decoration only |
| #155B5E text on white | 7.80:1 | AAA | Lc 86.8 | Fine for body text |
| #155B5E text on black | 2.68:1 | Fails | Lc -15.3 | 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 800.
-
Step 50
50
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECED
oklch(93.6% 0.011 204.1)
-
Step 200
200
#CADEDE
oklch(88.6% 0.021 196.8)
-
Step 300
300
#A4C9CA
oklch(80.9% 0.039 198.4)
-
Step 400
400
#71ADAF
oklch(70.7% 0.062 198.5)
-
Step 500
500
#47989C
oklch(63.1% 0.079 199.7)
-
Step 600
600
#218286
oklch(55.5% 0.085 199.1)
-
Step 700
700
#0F6E72
oklch(49.1% 0.08 199.5)
-
Step 800
800 (this color)
#155B5E
oklch(43.1% 0.066 199.3)
-
Step 900
900
#194A4C
oklch(37.7% 0.052 199)
-
Step 950
950
#112B2C
oklch(26.9% 0.032 198.8)
#155B5E 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) | #54575E | 0.067 |
| Deuteranopia (no green cones) | #494F5E | 0.062 |
| Tritanopia (no blue cones) | #005F5C | 0.016 |
| Achromatopsia (no color) | #525252 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155B5E
#155B5E
oklch(43.1% 0.066 199.3)
- #704141
#704141
oklch(43.2% 0.066 20.1)
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 #155B5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.020
- Deep Teal #00555A ΔE 0.023
- Dark Green Blue #1F6357 ΔE 0.033
- Dark Slate Gray #2F4F4F ΔE 0.040
- Dark Blue Green #005249 ΔE 0.043
- Dark Aqua #05696B ΔE 0.044
- Dark Teal #014D4E ΔE 0.050
- YInMn Blue #415A77 ΔE 0.063
Use #155B5E 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.