#42879B
Closest named color: Teal Blue (#01889F). oklch(58.7% 0.076 219.3), rgb(66, 135, 155).
Aa
Black text reads best on this color (5.17:1).
About this color
#42879B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.076 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.029 away. Black text reads best on it, at 5.17:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 5.17:1 |
| White text | 4.06:1 |
Values
| HEX | #42879B |
| RGB | rgb(66, 135, 155) |
| HSL | hsl(193, 40%, 43%) |
| OKLCH | oklch(58.7% 0.076 219.3) |
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 #42879B | 4.06:1 | AA large text | Lc -73.2 | Content text, not long reading |
| Black text on #42879B | 5.17:1 | AA | Lc 36.4 | Non-text elements, placeholder text |
| #42879B text on white | 4.06:1 | AA large text | Lc 67.7 | Content text, not long reading |
| #42879B text on black | 5.17:1 | AA | Lc -34.0 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECEE
oklch(93.7% 0.01 212.5)
-
Step 200
200
#CCDCE2
oklch(88.4% 0.019 222.2)
-
Step 300
300
#A9C6D0
oklch(80.8% 0.034 220.6)
-
Step 400
400
#7AA9B8
oklch(70.7% 0.055 219.6)
-
Step 500
500
#5694A6
oklch(63.2% 0.069 218.6)
-
Step 600
600 (this color)
#42879B
oklch(58.7% 0.076 219.3)
-
Step 700
700
#2A6A7C
oklch(49.1% 0.07 219.5)
-
Step 800
800
#245665
oklch(42.6% 0.059 220.5)
-
Step 900
900
#234752
oklch(37.6% 0.045 220)
-
Step 950
950
#152A30
oklch(27% 0.029 218.2)
#42879B 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) | #7A849C | 0.064 |
| Deuteranopia (no green cones) | #6D7A9B | 0.057 |
| Tritanopia (no blue cones) | #008E8D | 0.045 |
| Achromatopsia (no color) | #7E7E7E | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42879B
#42879B
oklch(58.7% 0.076 219.3)
- #A36D5A
#A36D5A
oklch(58.7% 0.075 40.2)
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 #42879B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.029
- Cerulean #457B9D ΔE 0.037
- Stormy Blue #507B9C ΔE 0.037
- Blue NCS #118AB2 ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.039
- Off Blue #5684AE ΔE 0.040
- Grey Blue #647D8E ΔE 0.042
- Dark Cyan #008B8B ΔE 0.044
Use #42879B 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.