#1F4E9B
Closest named color: Cobalt (#1E488F). oklch(43.7% 0.136 259.9), rgb(31, 78, 155).
Aa
White text reads best on this color (8.01:1).
About this color
#1F4E9B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.136 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.025 away. White text reads best on it, at 8.01:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.62:1 |
| White text | 8.01:1 |
Values
| HEX | #1F4E9B |
| RGB | rgb(31, 78, 155) |
| HSL | hsl(217, 67%, 36%) |
| OKLCH | oklch(43.7% 0.136 259.9) |
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 #1F4E9B | 8.01:1 | AAA | Lc -92.0 | Preferred for body text |
| Black text on #1F4E9B | 2.62:1 | Fails | Lc 16.7 | Dividers and decoration only |
| #1F4E9B text on white | 8.01:1 | AAA | Lc 87.3 | Fine for body text |
| #1F4E9B text on black | 2.62:1 | Fails | Lc -14.8 | 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
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF7
oklch(88.4% 0.045 259.9)
-
Step 300
300
#A3C2F4
oklch(80.9% 0.079 259.9)
-
Step 400
400
#71A1EF
oklch(70.8% 0.126 259.8)
-
Step 500
500
#4B87EA
oklch(63.2% 0.162 259.9)
-
Step 600
600
#2D6ED8
oklch(55.6% 0.176 259.9)
-
Step 700
700
#205BBC
oklch(49.1% 0.165 260.1)
-
Step 800
800 (this color)
#1F4E9B
oklch(43.7% 0.136 259.9)
-
Step 900
900
#1D3F79
oklch(37.6% 0.107 260.4)
-
Step 950
950
#122647
oklch(27.2% 0.067 259.9)
#1F4E9B 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) | #21569E | 0.023 |
| Deuteranopia (no green cones) | #004B99 | 0.019 |
| Tritanopia (no blue cones) | #00606D | 0.104 |
| Achromatopsia (no color) | #505050 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4E9B
#1F4E9B
oklch(43.7% 0.136 259.9)
- #6C4B00
#6C4B00
oklch(43.8% 0.091 79.6)
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 #1F4E9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.025
- Dusk Blue #26538D ΔE 0.030
- Light Navy #155084 ΔE 0.040
- Deep Sea Blue #015482 ΔE 0.050
- Blueberry #464196 ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.053
- Light Navy Blue #2E5A88 ΔE 0.053
- Sapphire #2138AB ΔE 0.061
Use #1F4E9B 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.