#1B2D52
Closest named color: Prussian Blue (#1D3557). oklch(30.3% 0.071 263.2), rgb(27, 45, 82).
Aa
White text reads best on this color (13.60:1).
About this color
#1B2D52 is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.071 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.026 away. White text reads best on it, at 13.60:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.54:1 |
| White text | 13.60:1 |
Values
| HEX | #1B2D52 |
| RGB | rgb(27, 45, 82) |
| HSL | hsl(220, 50%, 21%) |
| OKLCH | oklch(30.3% 0.071 263.2) |
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 #1B2D52 | 13.60:1 | AAA | Lc -103.1 | Preferred for body text |
| Black text on #1B2D52 | 1.54:1 | Fails | Lc 0.0 | Not readable |
| #1B2D52 text on white | 13.60:1 | AAA | Lc 100.0 | Preferred for body text |
| #1B2D52 text on black | 1.54:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C9DAF9
oklch(88.5% 0.047 262.5)
-
Step 300
300
#A4C1F8
oklch(80.9% 0.084 263)
-
Step 400
400
#749FF4
oklch(70.8% 0.134 263)
-
Step 500
500
#5084F0
oklch(63.1% 0.172 263.1)
-
Step 600
600
#356ADF
oklch(55.5% 0.188 263.3)
-
Step 700
700
#2858C2
oklch(49.2% 0.174 263.1)
-
Step 800
800
#22489D
oklch(42.6% 0.145 263.4)
-
Step 900
900
#203E7C
oklch(37.7% 0.111 262.8)
-
Step 950
950 (this color)
#1B2D52
oklch(30.3% 0.071 263.2)
#1B2D52 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) | #1D3153 | 0.013 |
| Deuteranopia (no green cones) | #152C51 | 0.008 |
| Tritanopia (no blue cones) | #00353B | 0.060 |
| Achromatopsia (no color) | #2E2E2E | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2D52
#1B2D52
oklch(30.3% 0.071 263.2)
- #3D2B00
#3D2B00
oklch(30.2% 0.062 83.8)
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 #1B2D52, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.026
- Marine #042E60 ΔE 0.030
- Space Cadet #2B2D42 ΔE 0.037
- Gunmetal #293241 ΔE 0.043
- Oxford Blue #1B263B ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.050
- Marine Blue #01386A ΔE 0.050
- Midnight Green #073B4C ΔE 0.051
Use #1B2D52 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.