#21879F
Closest named color: Teal Blue (#01889F). oklch(57.8% 0.095 217.9), rgb(33, 135, 159).
Aa
Black text reads best on this color (5.03:1).
About this color
#21879F is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.095 and its hue 218°. 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 5.03:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 5.03:1 |
| White text | 4.17:1 |
Values
| HEX | #21879F |
| RGB | rgb(33, 135, 159) |
| HSL | hsl(191, 66%, 38%) |
| OKLCH | oklch(57.8% 0.095 217.9) |
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 #21879F | 4.17:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #21879F | 5.03:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #21879F text on white | 4.17:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #21879F text on black | 5.03:1 | AA | Lc -33.3 | 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
#C9DDE4
oklch(88.5% 0.023 220.8)
-
Step 300
300
#A3C8D3
oklch(81% 0.042 217.8)
-
Step 400
400
#6EABBD
oklch(70.6% 0.068 218.5)
-
Step 500
500
#4196AD
oklch(63% 0.088 218.5)
-
Step 600
600 (this color)
#21879F
oklch(57.8% 0.095 217.9)
-
Step 700
700
#006C82
oklch(49.1% 0.088 218.4)
-
Step 800
800
#0B5869
oklch(42.6% 0.073 217.7)
-
Step 900
900
#164956
oklch(37.8% 0.057 218.1)
-
Step 950
950
#0F2B32
oklch(27.1% 0.036 216.6)
#21879F 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) | #7883A0 | 0.082 |
| Deuteranopia (no green cones) | #67779F | 0.073 |
| Tritanopia (no blue cones) | #008F8F | 0.041 |
| Achromatopsia (no color) | #7C7C7C | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21879F
#21879F
oklch(57.8% 0.095 217.9)
- #AA6550
#AA6550
oklch(57.9% 0.095 37.7)
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 #21879F, 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 0.029
- Dark Cyan #008B8B ΔE 0.039
- Cerulean #457B9D ΔE 0.039
- Ocean #017B92 ΔE 0.041
- Teal Green #0A9396 ΔE 0.043
- Stormy Blue #507B9C ΔE 0.045
- Steel Blue #4682B4 ΔE 0.048
Use #21879F 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.