#18405A
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.6% 0.064 240.4), rgb(24, 64, 90).
Aa
White text reads best on this color (10.93:1).
About this color
#18405A is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.064 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.024 away. White text reads best on it, at 10.93:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.91:1 |
| White text | 10.93:1 |
Values
| HEX | #18405A |
| RGB | rgb(24, 64, 90) |
| HSL | hsl(204, 58%, 22%) |
| OKLCH | oklch(35.6% 0.064 240.4) |
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 #18405A | 10.93:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #18405A | 1.91:1 | Fails | Lc 8.8 | Not readable |
| #18405A text on white | 10.93:1 | AAA | Lc 95.1 | Preferred for body text |
| #18405A text on black | 1.91:1 | Fails | Lc -7.5 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE9
oklch(88.5% 0.026 239.1)
-
Step 300
300
#A6C5DD
oklch(80.9% 0.048 241.5)
-
Step 400
400
#74A7CC
oklch(70.6% 0.077 240.7)
-
Step 500
500
#4E91BF
oklch(63.2% 0.097 240.7)
-
Step 600
600
#2D7AAB
oklch(55.5% 0.106 240.7)
-
Step 700
700
#1F6793
oklch(49.1% 0.099 240.5)
-
Step 800
800
#1C5477
oklch(42.7% 0.082 240.3)
-
Step 900
900 (this color)
#18405A
oklch(35.6% 0.064 240.4)
-
Step 950
950
#132938
oklch(27% 0.04 240.2)
#18405A 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) | #34405B | 0.033 |
| Deuteranopia (no green cones) | #2B3A5A | 0.026 |
| Tritanopia (no blue cones) | #004649 | 0.043 |
| Achromatopsia (no color) | #3D3D3D | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18405A
#18405A
oklch(35.6% 0.064 240.4)
- #543316
#543316
oklch(35.5% 0.064 59.7)
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 #18405A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.024
- Dark Grey Blue #29465B ΔE 0.028
- Charcoal #264653 ΔE 0.030
- Midnight Green #073B4C ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.035
- Marine Blue #01386A ΔE 0.045
- Onyx #343A40 ΔE 0.052
- Dark Teal #014D4E ΔE 0.054
Use #18405A 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.