#045B66
Closest named color: Petrol (#005F6A). oklch(43.2% 0.073 209.2), rgb(4, 91, 102).
Aa
White text reads best on this color (7.79:1).
About this color
#045B66 is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 43%, its chroma 0.073 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.013 away. White text reads best on it, at 7.79:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.69:1 |
| White text | 7.79:1 |
Values
| HEX | #045B66 |
| RGB | rgb(4, 91, 102) |
| HSL | hsl(187, 92%, 21%) |
| OKLCH | oklch(43.2% 0.073 209.2) |
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 #045B66 | 7.79:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #045B66 | 2.69:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #045B66 text on white | 7.79:1 | AAA | Lc 86.6 | Fine for body text |
| #045B66 text on black | 2.69:1 | Fails | Lc -15.5 | 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
#F1F7F7
oklch(97.2% 0.006 197.1)
-
Step 100
100
#E1ECEE
oklch(93.5% 0.012 209.8)
-
Step 200
200
#C8DEE2
oklch(88.5% 0.024 209.8)
-
Step 300
300
#A1C9D0
oklch(80.9% 0.043 209.4)
-
Step 400
400
#6BADB8
oklch(70.8% 0.069 209.2)
-
Step 500
500
#3D98A6
oklch(63.1% 0.087 209.2)
-
Step 600
600
#048291
oklch(55.6% 0.095 209)
-
Step 700
700
#006D7B
oklch(49% 0.085 210.2)
-
Step 800
800 (this color)
#045B66
oklch(43.2% 0.073 209.2)
-
Step 900
900
#124A52
oklch(37.8% 0.057 208.9)
-
Step 950
950
#0D2B30
oklch(26.9% 0.036 210.1)
#045B66 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) | #515767 | 0.069 |
| Deuteranopia (no green cones) | #454E66 | 0.064 |
| Tritanopia (no blue cones) | #00605E | 0.024 |
| Achromatopsia (no color) | #525252 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #045B66
#045B66
oklch(43.2% 0.073 209.2)
- #734038
#734038
oklch(43.2% 0.073 29.8)
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 #045B66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.013
- Deep Teal #00555A ΔE 0.025
- Dark Green Blue #1F6357 ΔE 0.043
- Dark Aqua #05696B ΔE 0.044
- Dark Slate Gray #2F4F4F ΔE 0.047
- Dark Blue Green #005249 ΔE 0.051
- Dark Teal #014D4E ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.058
Use #045B66 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.