#1B4497
Closest named color: Cobalt (#1E488F). oklch(41% 0.144 262.3), rgb(27, 68, 151).
Aa
White text reads best on this color (9.05:1).
About this color
#1B4497 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.144 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.018 away. White text reads best on it, at 9.05:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.32:1 |
| White text | 9.05:1 |
Values
| HEX | #1B4497 |
| RGB | rgb(27, 68, 151) |
| HSL | hsl(220, 70%, 35%) |
| OKLCH | oklch(41% 0.144 262.3) |
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 #1B4497 | 9.05:1 | AAA | Lc -94.7 | Preferred for body text |
| Black text on #1B4497 | 2.32:1 | Fails | Lc 13.7 | Not readable |
| #1B4497 text on white | 9.05:1 | AAA | Lc 90.3 | Preferred for body text |
| #1B4497 text on black | 2.32:1 | Fails | Lc -12.0 | 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 800.
-
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
#A3C1F8
oklch(80.8% 0.085 262.3)
-
Step 400
400
#729FF4
oklch(70.7% 0.134 262.3)
-
Step 500
500
#4D84F0
oklch(63% 0.173 262.3)
-
Step 600
600
#326BDF
oklch(55.6% 0.187 262.4)
-
Step 700
700
#2558C1
oklch(49% 0.174 262.4)
-
Step 800
800 (this color)
#1B4497
oklch(41% 0.144 262.3)
-
Step 900
900
#1F3E7C
oklch(37.7% 0.112 262.4)
-
Step 950
950
#122549
oklch(27% 0.071 261.9)
#1B4497 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) | #004F9A | 0.030 |
| Deuteranopia (no green cones) | #004395 | 0.015 |
| Tritanopia (no blue cones) | #005866 | 0.111 |
| Achromatopsia (no color) | #494949 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4497
#1B4497
oklch(41% 0.144 262.3)
- #614500
#614500
oklch(41% 0.085 82.1)
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 #1B4497, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.018
- Sapphire #2138AB ΔE 0.043
- Light Navy #155084 ΔE 0.049
- Dusk Blue #26538D ΔE 0.050
- Twilight Blue #0A437A ΔE 0.051
- Blueberry #464196 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.059
- Deep Sea Blue #015482 ΔE 0.062
Use #1B4497 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.