#1B256B
Closest named color: Midnight Blue (#191970). oklch(30.6% 0.121 271), rgb(27, 37, 107).
Aa
White text reads best on this color (13.78:1).
About this color
#1B256B is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.121 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Blue (#191970), ΔE 0.029 away. White text reads best on it, at 13.78:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Midnight Blue (#191970) |
| Black text | 1.52:1 |
| White text | 13.78:1 |
Values
| HEX | #1B256B |
| RGB | rgb(27, 37, 107) |
| HSL | hsl(233, 60%, 26%) |
| OKLCH | oklch(30.6% 0.121 271) |
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 #1B256B | 13.78:1 | AAA | Lc -103.1 | Preferred for body text |
| Black text on #1B256B | 1.52:1 | Fails | Lc 0.0 | Not readable |
| #1B256B text on white | 13.78:1 | AAA | Lc 99.9 | Preferred for body text |
| #1B256B text on black | 1.52:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#AABEFF
oklch(81% 0.095 271)
-
Step 400
400
#7E99FF
oklch(70.7% 0.152 270.9)
-
Step 500
500
#607BFF
oklch(63.2% 0.197 271)
-
Step 600
600
#4658FF
oklch(55.6% 0.245 271)
-
Step 700
700
#372BFF
oklch(49.1% 0.287 271)
-
Step 800
800
#2C24D2
oklch(42.7% 0.246 271)
-
Step 900
900
#2429A5
oklch(37.8% 0.192 270.9)
-
Step 950
950 (this color)
#1B256B
oklch(30.6% 0.121 271)
#1B256B 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) | #00316D | 0.035 |
| Deuteranopia (no green cones) | #00296A | 0.024 |
| Tritanopia (no blue cones) | #003744 | 0.097 |
| Achromatopsia (no color) | #2D2D2D | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B256B
#1B256B
oklch(30.6% 0.121 271)
- #3B2D00
#3B2D00
oklch(30.4% 0.062 90.1)
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 #1B256B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Blue #191970 ΔE 0.029
- Marine #042E60 ΔE 0.036
- Marine Blue #01386A ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.062
- Dark Royal Blue #02066F ΔE 0.070
- Deep Blue #040273 ΔE 0.072
- Royal #0C1793 ΔE 0.074
- Dark Indigo #1F0954 ΔE 0.074
Use #1B256B 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.