#00636A
Closest named color: Petrol (#005F6A). oklch(45.5% 0.078 203.3), rgb(0, 99, 106).
Aa
White text reads best on this color (7.01:1).
About this color
#00636A is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 46%, its chroma 0.078 and its hue 203°. 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 7.01:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.99:1 |
| White text | 7.01:1 |
Values
| HEX | #00636A |
| RGB | rgb(0, 99, 106) |
| HSL | hsl(184, 100%, 21%) |
| OKLCH | oklch(45.5% 0.078 203.3) |
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 #00636A | 7.01:1 | AAA | Lc -88.8 | Fine for body text |
| Black text on #00636A | 2.99:1 | Fails | Lc 20.3 | Dividers and decoration only |
| #00636A text on white | 7.01:1 | AAA | Lc 83.8 | Fine for body text |
| #00636A text on black | 2.99:1 | Fails | Lc -18.2 | 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
#E0EDEE
oklch(93.7% 0.014 202.5)
-
Step 200
200
#C7DEE0
oklch(88.4% 0.025 203.1)
-
Step 300
300
#9FCACE
oklch(81% 0.046 203.3)
-
Step 400
400
#67AEB5
oklch(70.7% 0.072 203.8)
-
Step 500
500
#339AA2
oklch(63.2% 0.092 202.5)
-
Step 600
600
#00838C
oklch(55.6% 0.095 203.3)
-
Step 700
700
#006E76
oklch(49.1% 0.084 203.6)
-
Step 800
800 (this color)
#00636A
oklch(45.5% 0.078 203.3)
-
Step 900
900
#0A4B50
oklch(37.8% 0.06 203)
-
Step 950
950
#0A2C2F
oklch(27% 0.039 203.4)
#00636A 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) | #5A5E6B | 0.078 |
| Deuteranopia (no green cones) | #4D556A | 0.071 |
| Tritanopia (no blue cones) | #006865 | 0.020 |
| Achromatopsia (no color) | #595959 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00636A
#00636A
oklch(45.5% 0.078 203.3)
- #7C4442
#7C4442
oklch(45.4% 0.078 22.7)
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 #00636A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.013
- Dark Aqua #05696B ΔE 0.020
- Dark Green Blue #1F6357 ΔE 0.032
- Deep Teal #00555A ΔE 0.047
- Deep Turquoise #017374 ΔE 0.050
- Dark Aquamarine #017371 ΔE 0.050
- YInMn Blue #415A77 ΔE 0.059
- Dark Slate Gray #2F4F4F ΔE 0.066
Use #00636A 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.