#21798F
Closest named color: Ocean (#017B92). oklch(53.6% 0.086 218.6), rgb(33, 121, 143).
Aa
White text reads best on this color (5.00:1).
About this color
#21798F is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 54%, its chroma 0.086 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean (#017B92), ΔE 0.010 away. White text reads best on it, at 5.00:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Ocean (#017B92) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #21798F |
| RGB | rgb(33, 121, 143) |
| HSL | hsl(192, 63%, 35%) |
| OKLCH | oklch(53.6% 0.086 218.6) |
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 #21798F | 5.00:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #21798F | 4.19:1 | AA large text | Lc 29.8 | Dividers and decoration only |
| #21798F text on white | 5.00:1 | AA | Lc 74.3 | Content text, not long reading |
| #21798F text on black | 4.19:1 | AA large text | Lc -27.4 | 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 600.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECEF
oklch(93.6% 0.011 217.5)
-
Step 200
200
#CADDE3
oklch(88.5% 0.022 218.6)
-
Step 300
300
#A6C7D2
oklch(80.9% 0.039 220)
-
Step 400
400
#74AABB
oklch(70.6% 0.062 219.6)
-
Step 500
500
#4C95AA
oklch(63.1% 0.079 219)
-
Step 600
600 (this color)
#21798F
oklch(53.6% 0.086 218.6)
-
Step 700
700
#1A6B7F
oklch(49% 0.08 218.7)
-
Step 800
800
#195767
oklch(42.5% 0.066 218.7)
-
Step 900
900
#1D4854
oklch(37.7% 0.051 218.9)
-
Step 950
950
#122A31
oklch(26.9% 0.033 219.1)
#21798F 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) | #6B7590 | 0.073 |
| Deuteranopia (no green cones) | #5C6B8F | 0.065 |
| Tritanopia (no blue cones) | #008080 | 0.038 |
| Achromatopsia (no color) | #6F6F6F | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21798F
#21798F
oklch(53.6% 0.086 218.6)
- #985B47
#985B47
oklch(53.5% 0.086 38.9)
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 #21798F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean #017B92 ΔE 0.010
- Sea Blue #047495 ΔE 0.023
- Deep Aqua #08787F ΔE 0.028
- Cerulean #457B9D ΔE 0.038
- Ocean Blue #03719C ΔE 0.038
- Teal #008080 ΔE 0.038
- Metallic Blue #4F738E ΔE 0.039
- Bluegreen #017A79 ΔE 0.040
Use #21798F 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.