#1A437E
Closest named color: Twilight Blue (#0A437A). oklch(38.8% 0.11 258), rgb(26, 67, 126).
Aa
White text reads best on this color (9.77:1).
About this color
#1A437E is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.110 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.012 away. White text reads best on it, at 9.77:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.14:1 |
| White text | 9.77:1 |
Values
| HEX | #1A437E |
| RGB | rgb(26, 67, 126) |
| HSL | hsl(215, 66%, 30%) |
| OKLCH | oklch(38.8% 0.11 258) |
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 #1A437E | 9.77:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #1A437E | 2.14:1 | Fails | Lc 11.6 | Not readable |
| #1A437E text on white | 9.77:1 | AAA | Lc 92.3 | Preferred for body text |
| #1A437E text on black | 2.14:1 | Fails | Lc -10.1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF8
oklch(88.6% 0.046 257.6)
-
Step 300
300
#A0C3F6
oklch(81% 0.082 257.7)
-
Step 400
400
#6BA1F2
oklch(70.6% 0.133 258.3)
-
Step 500
500
#4187ED
oklch(63% 0.169 258.1)
-
Step 600
600
#1F6FDC
oklch(55.7% 0.183 258)
-
Step 700
700
#105CBF
oklch(49.2% 0.171 258)
-
Step 800
800
#124B9A
oklch(42.6% 0.141 258.2)
-
Step 900
900 (this color)
#1A437E
oklch(38.8% 0.11 258)
-
Step 950
950
#0F2648
oklch(27.1% 0.07 258.2)
#1A437E 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) | #244980 | 0.021 |
| Deuteranopia (no green cones) | #0E407D | 0.013 |
| Tritanopia (no blue cones) | #00515A | 0.085 |
| Achromatopsia (no color) | #444444 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1A437E
#1A437E
oklch(38.8% 0.11 258)
- #5C3E00
#5C3E00
oklch(38.8% 0.081 77.9)
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 #1A437E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.012
- Cobalt #1E488F ΔE 0.031
- Light Navy #155084 ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.049
- Marine Blue #01386A ΔE 0.051
- Dusk Blue #26538D ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.064
Use #1A437E 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.