#1B438E
Closest named color: Cobalt (#1E488F). oklch(40.1% 0.133 261.5), rgb(27, 67, 142).
Aa
White text reads best on this color (9.37:1).
About this color
#1B438E is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.133 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.015 away. White text reads best on it, at 9.37:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.24:1 |
| White text | 9.37:1 |
Values
| HEX | #1B438E |
| RGB | rgb(27, 67, 142) |
| HSL | hsl(219, 68%, 33%) |
| OKLCH | oklch(40.1% 0.133 261.5) |
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 #1B438E | 9.37:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #1B438E | 2.24:1 | Fails | Lc 12.8 | Not readable |
| #1B438E text on white | 9.37:1 | AAA | Lc 91.2 | Preferred for body text |
| #1B438E text on black | 2.24:1 | Fails | Lc -11.1 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEBFE
oklch(93.7% 0.029 259.6)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#699EFF
oklch(70.6% 0.153 261.6)
-
Step 500
500
#3F82FF
oklch(63.1% 0.198 261.5)
-
Step 600
600
#1B66F1
oklch(55.5% 0.221 261.5)
-
Step 700
700
#0D54D2
oklch(49.1% 0.205 261.4)
-
Step 800
800
#0F46AA
oklch(42.8% 0.17 261.4)
-
Step 900
900 (this color)
#1B438E
oklch(40.1% 0.133 261.5)
-
Step 950
950
#0D244F
oklch(27% 0.084 261.5)
#1B438E 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) | #104C91 | 0.025 |
| Deuteranopia (no green cones) | #00418D | 0.017 |
| Tritanopia (no blue cones) | #005562 | 0.102 |
| Achromatopsia (no color) | #464646 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B438E
#1B438E
oklch(40.1% 0.133 261.5)
- #5E4200
#5E4200
oklch(40% 0.083 81.2)
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 #1B438E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.015
- Twilight Blue #0A437A ΔE 0.036
- Light Navy #155084 ΔE 0.043
- Dusk Blue #26538D ΔE 0.049
- Blueberry #464196 ΔE 0.054
- Sapphire #2138AB ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.057
Use #1B438E 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.