#18404B
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.8% 0.048 218.8), rgb(24, 64, 75).
Aa
White text reads best on this color (11.20:1).
About this color
#18404B is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.048 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.019 away. White text reads best on it, at 11.20:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.87:1 |
| White text | 11.20:1 |
Values
| HEX | #18404B |
| RGB | rgb(24, 64, 75) |
| HSL | hsl(193, 52%, 19%) |
| OKLCH | oklch(34.8% 0.048 218.8) |
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 #18404B | 11.20:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #18404B | 1.87:1 | Fails | Lc 8.2 | Not readable |
| #18404B text on white | 11.20:1 | AAA | Lc 95.7 | Preferred for body text |
| #18404B text on black | 1.87:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3ECEF
oklch(93.7% 0.01 219.6)
-
Step 200
200
#CBDDE2
oklch(88.6% 0.021 216.2)
-
Step 300
300
#A8C7D1
oklch(81% 0.036 219.3)
-
Step 400
400
#77AAB9
oklch(70.7% 0.058 218.1)
-
Step 500
500
#5194A8
oklch(63% 0.074 219.4)
-
Step 600
600
#327E93
oklch(55.5% 0.08 219.2)
-
Step 700
700
#236B7D
oklch(49.2% 0.075 217.8)
-
Step 800
800
#205766
oklch(42.7% 0.062 219)
-
Step 900
900 (this color)
#18404B
oklch(34.8% 0.048 218.8)
-
Step 950
950
#142A31
oklch(27% 0.031 220.6)
#18404B 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 | 0.041 |
| Deuteranopia (no green cones) | #32394B | 0.037 |
| Tritanopia (no blue cones) | #004443 | 0.027 |
| Achromatopsia (no color) | #3B3B3B | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18404B
#18404B
oklch(34.8% 0.048 218.8)
- #503127
#503127
oklch(34.8% 0.049 38.6)
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 #18404B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.019
- Midnight Green #073B4C ΔE 0.023
- Charcoal #264653 ΔE 0.028
- Onyx #343A40 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.038
- Dark Teal #014D4E ΔE 0.043
- Gunmetal #293241 ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.047
Use #18404B 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.