#21596E
Closest named color: Petrol (#005F6A). oklch(43.7% 0.067 226.3), rgb(33, 89, 110).
Aa
White text reads best on this color (7.72:1).
About this color
#21596E is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.067 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 7.72:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.71:1 |
| White text | 7.72:1 |
Values
| HEX | #21596E |
| RGB | rgb(33, 89, 110) |
| HSL | hsl(196, 54%, 28%) |
| OKLCH | oklch(43.7% 0.067 226.3) |
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 #21596E | 7.72:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #21596E | 2.71:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #21596E text on white | 7.72:1 | AAA | Lc 86.6 | Fine for body text |
| #21596E text on black | 2.71:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CBDCE4
oklch(88.4% 0.021 227.6)
-
Step 300
300
#A7C6D4
oklch(80.8% 0.039 226.9)
-
Step 400
400
#76A9BF
oklch(70.7% 0.063 226.7)
-
Step 500
500
#4F94AF
oklch(63.2% 0.081 225.8)
-
Step 600
600
#2F7D9A
oklch(55.5% 0.087 226.4)
-
Step 700
700
#216A84
oklch(49.2% 0.081 226.1)
-
Step 800
800 (this color)
#21596E
oklch(43.7% 0.067 226.3)
-
Step 900
900
#1F4757
oklch(37.6% 0.052 226.9)
-
Step 950
950
#132A33
oklch(27.1% 0.033 225.6)
#21596E 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) | #4E576F | 0.051 |
| Deuteranopia (no green cones) | #434F6E | 0.045 |
| Tritanopia (no blue cones) | #005F60 | 0.038 |
| Achromatopsia (no color) | #535353 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21596E
#21596E
oklch(43.7% 0.067 226.3)
- #704631
#704631
oklch(43.8% 0.067 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 #21596E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.025
- YInMn Blue #415A77 ΔE 0.038
- Deep Teal #00555A ΔE 0.040
- Deep Sea Blue #015482 ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.046
- Dark Slate Gray #2F4F4F ΔE 0.052
- Light Navy #155084 ΔE 0.053
- Dark Aqua #05696B ΔE 0.053
Use #21596E 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.