#21879D
Closest named color: Teal Blue (#01889F). oklch(57.7% 0.094 216.2), rgb(33, 135, 157).
Aa
Black text reads best on this color (5.01:1).
About this color
#21879D is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.094 and its hue 216°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.008 away. Black text reads best on it, at 5.01:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 5.01:1 |
| White text | 4.18:1 |
Values
| HEX | #21879D |
| RGB | rgb(33, 135, 157) |
| HSL | hsl(191, 65%, 37%) |
| OKLCH | oklch(57.7% 0.094 216.2) |
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 #21879D | 4.18:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #21879D | 5.01:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #21879D text on white | 4.18:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #21879D text on black | 5.01:1 | AA | Lc -33.2 | Non-text elements, placeholder text |
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
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECEF
oklch(93.6% 0.012 215.8)
-
Step 200
200
#C9DDE3
oklch(88.4% 0.023 217.7)
-
Step 300
300
#A3C8D2
oklch(80.9% 0.042 216)
-
Step 400
400
#6EACBC
oklch(70.8% 0.068 215.9)
-
Step 500
500
#4296AB
oklch(63% 0.086 216.8)
-
Step 600
600 (this color)
#21879D
oklch(57.7% 0.094 216.2)
-
Step 700
700
#006C80
oklch(49% 0.087 216.4)
-
Step 800
800
#0B5868
oklch(42.6% 0.072 216.5)
-
Step 900
900
#164955
oklch(37.7% 0.056 216.5)
-
Step 950
950
#0F2B32
oklch(27.1% 0.036 216.6)
#21879D 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) | #78839E | 0.082 |
| Deuteranopia (no green cones) | #68779D | 0.074 |
| Tritanopia (no blue cones) | #008F8E | 0.040 |
| Achromatopsia (no color) | #7C7C7C | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21879D
#21879D
oklch(57.7% 0.094 216.2)
- #A96552
#A96552
oklch(57.8% 0.093 36.4)
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 #21879D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.008
- Blue NCS #118AB2 ΔE 0.032
- Dark Cyan #008B8B ΔE 0.036
- Ocean #017B92 ΔE 0.040
- Cerulean #457B9D ΔE 0.040
- Teal Green #0A9396 ΔE 0.041
- Stormy Blue #507B9C ΔE 0.046
- Teal #008080 ΔE 0.049
Use #21879D 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.