#1B4B60
Closest named color: Dark Grey Blue (#29465B). oklch(39% 0.062 230.2), rgb(27, 75, 96).
Aa
White text reads best on this color (9.45:1).
About this color
#1B4B60 is a dark, muted blue. In OKLCH its lightness is 39%, its chroma 0.062 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.019 away. White text reads best on it, at 9.45:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.22:1 |
| White text | 9.45:1 |
Values
| HEX | #1B4B60 |
| RGB | rgb(27, 75, 96) |
| HSL | hsl(198, 56%, 24%) |
| OKLCH | oklch(39% 0.062 230.2) |
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 #1B4B60 | 9.45:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #1B4B60 | 2.22:1 | Fails | Lc 12.3 | Not readable |
| #1B4B60 text on white | 9.45:1 | AAA | Lc 91.6 | Preferred for body text |
| #1B4B60 text on black | 2.22:1 | Fails | Lc -10.7 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C9DDE7
oklch(88.6% 0.025 229.2)
-
Step 300
300
#A3C7D9
oklch(80.9% 0.046 229.7)
-
Step 400
400
#6EAAC6
oklch(70.7% 0.074 229.2)
-
Step 500
500
#4394B8
oklch(63.1% 0.095 230)
-
Step 600
600
#1A7EA4
oklch(55.7% 0.103 229.8)
-
Step 700
700
#066A8D
oklch(49.2% 0.097 230.3)
-
Step 800
800
#0E5672
oklch(42.6% 0.08 230.5)
-
Step 900
900 (this color)
#1B4B60
oklch(39% 0.062 230.2)
-
Step 950
950
#0F2A36
oklch(27% 0.04 229.8)
#1B4B60 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) | #404A61 | 0.043 |
| Deuteranopia (no green cones) | #374360 | 0.037 |
| Tritanopia (no blue cones) | #005152 | 0.038 |
| Achromatopsia (no color) | #464646 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4B60
#1B4B60
oklch(39% 0.062 230.2)
- #603B25
#603B25
oklch(39.1% 0.063 50.8)
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 #1B4B60, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.019
- Charcoal #264653 ΔE 0.024
- Dark Teal #014D4E ΔE 0.038
- Deep Teal #00555A ΔE 0.038
- Dark Slate Gray #2F4F4F ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.054
- Dark Blue Green #005249 ΔE 0.054
- Twilight Blue #0A437A ΔE 0.057
Use #1B4B60 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.