#1A3F5C
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.5% 0.066 244.9), rgb(26, 63, 92).
Aa
White text reads best on this color (10.99:1).
About this color
#1A3F5C is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.066 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.026 away. White text reads best on it, at 10.99:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.90:1 |
| White text | 10.99:1 |
Values
| HEX | #1A3F5C |
| RGB | rgb(26, 63, 92) |
| HSL | hsl(206, 56%, 23%) |
| OKLCH | oklch(35.5% 0.066 244.9) |
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 #1A3F5C | 10.99:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #1A3F5C | 1.90:1 | Fails | Lc 8.7 | Not readable |
| #1A3F5C text on white | 10.99:1 | AAA | Lc 95.2 | Preferred for body text |
| #1A3F5C text on black | 1.90:1 | Fails | Lc -7.4 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CBDCEA
oklch(88.6% 0.027 242.8)
-
Step 300
300
#A7C5DF
oklch(81% 0.049 244.6)
-
Step 400
400
#76A6CF
oklch(70.7% 0.079 245)
-
Step 500
500
#518FC3
oklch(63% 0.102 245.7)
-
Step 600
600
#3279AF
oklch(55.6% 0.11 244.8)
-
Step 700
700
#246596
oklch(49% 0.102 245.1)
-
Step 800
800
#20537A
oklch(42.7% 0.084 244.9)
-
Step 900
900 (this color)
#1A3F5C
oklch(35.5% 0.066 244.9)
-
Step 950
950
#142839
oklch(26.9% 0.041 245.8)
#1A3F5C 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) | #32405D | 0.029 |
| Deuteranopia (no green cones) | #29395B | 0.023 |
| Tritanopia (no blue cones) | #004649 | 0.049 |
| Achromatopsia (no color) | #3C3C3C | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1A3F5C
#1A3F5C
oklch(35.5% 0.066 244.9)
- #533411
#533411
oklch(35.5% 0.066 65.7)
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 #1A3F5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.030
- Prussian Blue #1D3557 ΔE 0.031
- Midnight Green #073B4C ΔE 0.034
- Charcoal #264653 ΔE 0.034
- Marine Blue #01386A ΔE 0.040
- Twilight Blue #0A437A ΔE 0.051
- Onyx #343A40 ΔE 0.054
Use #1A3F5C 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.