#1B455E
Closest named color: Dark Grey Blue (#29465B). oklch(37.3% 0.063 238), rgb(27, 69, 94).
Aa
White text reads best on this color (10.19:1).
About this color
#1B455E is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.063 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.016 away. White text reads best on it, at 10.19:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.05:1 |
| White text | 10.19:1 |
Values
| HEX | #1B455E |
| RGB | rgb(27, 69, 94) |
| HSL | hsl(202, 55%, 24%) |
| OKLCH | oklch(37.3% 0.063 238) |
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 #1B455E | 10.19:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #1B455E | 2.05:1 | Fails | Lc 10.5 | Not readable |
| #1B455E text on white | 10.19:1 | AAA | Lc 93.5 | Preferred for body text |
| #1B455E text on black | 2.05:1 | Fails | Lc -9.0 | 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
#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
#A5C6DC
oklch(81% 0.047 237.4)
-
Step 400
400
#73A8CB
oklch(70.8% 0.076 238.2)
-
Step 500
500
#4B92BD
oklch(63.2% 0.096 237.6)
-
Step 600
600
#297BA9
oklch(55.5% 0.105 237.9)
-
Step 700
700
#1A6891
oklch(49.2% 0.097 237.3)
-
Step 800
800
#195576
oklch(42.8% 0.081 237.5)
-
Step 900
900 (this color)
#1B455E
oklch(37.3% 0.063 238)
-
Step 950
950
#122938
oklch(27% 0.04 239.2)
#1B455E 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) | #39455F | 0.035 |
| Deuteranopia (no green cones) | #303E5E | 0.030 |
| Tritanopia (no blue cones) | #004B4E | 0.042 |
| Achromatopsia (no color) | #414141 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B455E
#1B455E
oklch(37.3% 0.063 238)
- #59371C
#59371C
oklch(37.1% 0.063 57.6)
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 #1B455E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.016
- Charcoal #264653 ΔE 0.022
- Dark Blue Grey #1F3B4D ΔE 0.038
- Midnight Green #073B4C ΔE 0.046
- Dark Teal #014D4E ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.051
- Twilight Blue #0A437A ΔE 0.051
- Dark Slate Gray #2F4F4F ΔE 0.053
Use #1B455E 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.