#223F4B
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35% 0.041 226.6), rgb(34, 63, 75).
Aa
White text reads best on this color (11.16:1).
About this color
#223F4B is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.041 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.016 away. White text reads best on it, at 11.16:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.88:1 |
| White text | 11.16:1 |
Values
| HEX | #223F4B |
| RGB | rgb(34, 63, 75) |
| HSL | hsl(198, 38%, 21%) |
| OKLCH | oklch(35% 0.041 226.6) |
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 #223F4B | 11.16:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #223F4B | 1.88:1 | Fails | Lc 8.2 | Not readable |
| #223F4B text on white | 11.16:1 | AAA | Lc 95.7 | Preferred for body text |
| #223F4B text on black | 1.88:1 | Fails | Lc 0.0 | Not readable |
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 900.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBEE
oklch(93.6% 0.009 225.1)
-
Step 200
200
#CEDCE2
oklch(88.6% 0.017 225.2)
-
Step 300
300
#ADC5D0
oklch(80.9% 0.03 227.1)
-
Step 400
400
#81A7B8
oklch(70.6% 0.048 227.1)
-
Step 500
500
#6092A7
oklch(63.2% 0.062 226.3)
-
Step 600
600
#457C92
oklch(55.7% 0.067 226)
-
Step 700
700
#36687C
oklch(49.1% 0.063 226.3)
-
Step 800
800
#2D5565
oklch(42.7% 0.052 226.1)
-
Step 900
900 (this color)
#223F4B
oklch(35% 0.041 226.6)
-
Step 950
950
#182930
oklch(26.9% 0.026 225.8)
#223F4B 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) | #393E4C | 0.032 |
| Deuteranopia (no green cones) | #33394B | 0.028 |
| Tritanopia (no blue cones) | #0C4343 | 0.029 |
| Achromatopsia (no color) | #3B3B3B | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #223F4B
#223F4B
oklch(35% 0.041 226.6)
- #4C3428
#4C3428
oklch(34.9% 0.04 47.5)
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 #223F4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.016
- Charcoal #264653 ΔE 0.025
- Midnight Green #073B4C ΔE 0.028
- Onyx #343A40 ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.034
- Charcoal Grey #3C4142 ΔE 0.040
- Gunmetal #293241 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.045
Use #223F4B 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.