#1B2F4E
Closest named color: Prussian Blue (#1D3557). oklch(30.5% 0.062 258.9), rgb(27, 47, 78).
Aa
White text reads best on this color (13.43:1).
About this color
#1B2F4E is a dark, muted blue. In OKLCH its lightness is 31%, its chroma 0.062 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.023 away. White text reads best on it, at 13.43:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.56:1 |
| White text | 13.43:1 |
Values
| HEX | #1B2F4E |
| RGB | rgb(27, 47, 78) |
| HSL | hsl(216, 49%, 21%) |
| OKLCH | oklch(30.5% 0.062 258.9) |
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 #1B2F4E | 13.43:1 | AAA | Lc -102.9 | Preferred for body text |
| Black text on #1B2F4E | 1.56:1 | Fails | Lc 0.0 | Not readable |
| #1B2F4E text on white | 13.43:1 | AAA | Lc 99.8 | Preferred for body text |
| #1B2F4E text on black | 1.56:1 | 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 950.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DAF5
oklch(88.4% 0.042 259.6)
-
Step 300
300
#A4C2F1
oklch(80.8% 0.074 259.3)
-
Step 400
400
#73A1E9
oklch(70.6% 0.117 259.1)
-
Step 500
500
#4E88E3
oklch(63.1% 0.15 259.1)
-
Step 600
600
#3070D1
oklch(55.6% 0.164 258.8)
-
Step 700
700
#235DB5
oklch(49.1% 0.152 258.9)
-
Step 800
800
#1F4C92
oklch(42.6% 0.126 259.1)
-
Step 900
900
#1E4075
oklch(37.6% 0.099 259)
-
Step 950
950 (this color)
#1B2F4E
oklch(30.5% 0.062 258.9)
#1B2F4E 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) | #22314F | 0.012 |
| Deuteranopia (no green cones) | #1B2D4D | 0.006 |
| Tritanopia (no blue cones) | #00363A | 0.054 |
| Achromatopsia (no color) | #2F2F2F | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2F4E
#1B2F4E
oklch(30.5% 0.062 258.9)
- #402B01
#402B01
oklch(30.6% 0.063 79.3)
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 #1B2F4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.023
- Space Cadet #2B2D42 ΔE 0.030
- Gunmetal #293241 ΔE 0.034
- Marine #042E60 ΔE 0.037
- Oxford Blue #1B263B ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.042
- Midnight Green #073B4C ΔE 0.042
- Marine Blue #01386A ΔE 0.053
Use #1B2F4E 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.