#1B405B
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.8% 0.063 243), rgb(27, 64, 91).
Aa
White text reads best on this color (10.87:1).
About this color
#1B405B is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.063 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.026 away. White text reads best on it, at 10.87:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.93:1 |
| White text | 10.87:1 |
Values
| HEX | #1B405B |
| RGB | rgb(27, 64, 91) |
| HSL | hsl(205, 54%, 23%) |
| OKLCH | oklch(35.8% 0.063 243) |
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 #1B405B | 10.87:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #1B405B | 1.93:1 | Fails | Lc 8.9 | Not readable |
| #1B405B text on white | 10.87:1 | AAA | Lc 95.0 | Preferred for body text |
| #1B405B text on black | 1.93:1 | Fails | Lc -7.6 | 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
#CBDCEA
oklch(88.6% 0.027 242.8)
-
Step 300
300
#A7C5DD
oklch(80.9% 0.047 242.4)
-
Step 400
400
#77A7CD
oklch(70.8% 0.076 243)
-
Step 500
500
#5190BF
oklch(63.1% 0.096 242.6)
-
Step 600
600
#3379AC
oklch(55.5% 0.106 243.5)
-
Step 700
700
#246694
oklch(49.1% 0.099 243.2)
-
Step 800
800
#205378
oklch(42.6% 0.082 243.5)
-
Step 900
900 (this color)
#1B405B
oklch(35.8% 0.063 243)
-
Step 950
950
#142938
oklch(27.1% 0.039 241.3)
#1B405B 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) | #34405C | 0.030 |
| Deuteranopia (no green cones) | #2B3A5B | 0.024 |
| Tritanopia (no blue cones) | #004749 | 0.048 |
| Achromatopsia (no color) | #3D3D3D | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B405B
#1B405B
oklch(35.8% 0.063 243)
- #543516
#543516
oklch(35.9% 0.063 63.3)
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 #1B405B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.026
- Charcoal #264653 ΔE 0.030
- Midnight Green #073B4C ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.035
- Marine Blue #01386A ΔE 0.045
- Onyx #343A40 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.053
Use #1B405B 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.