#1F4F9C
Closest named color: Cobalt (#1E488F). oklch(44% 0.136 259.6), rgb(31, 79, 156).
Aa
White text reads best on this color (7.90:1).
About this color
#1F4F9C 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 0.028 away. White text reads best on it, at 7.90:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.65:1 |
| White text | 7.90:1 |
Values
| HEX | #1F4F9C |
| RGB | rgb(31, 79, 156) |
| HSL | hsl(217, 67%, 37%) |
| OKLCH | oklch(44% 0.136 259.6) |
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 #1F4F9C | 7.90:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #1F4F9C | 2.65:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #1F4F9C text on white | 7.90:1 | AAA | Lc 87.0 | Fine for body text |
| #1F4F9C text on black | 2.65:1 | Fails | Lc -15.1 | Dividers and decoration only |
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
#70A1EF
oklch(70.7% 0.127 259.4)
-
Step 500
500
#4A87EA
oklch(63.1% 0.162 259.6)
-
Step 600
600
#2C6ED8
oklch(55.6% 0.176 259.7)
-
Step 700
700
#1E5BBC
oklch(49% 0.165 259.7)
-
Step 800
800 (this color)
#1F4F9C
oklch(44% 0.136 259.6)
-
Step 900
900
#1C4079
oklch(37.8% 0.106 259.3)
-
Step 950
950
#112647
oklch(27.1% 0.067 259.1)
#1F4F9C 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) | #22579F | 0.023 |
| Deuteranopia (no green cones) | #004C9A | 0.019 |
| Tritanopia (no blue cones) | #00616E | 0.104 |
| Achromatopsia (no color) | #515151 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4F9C
#1F4F9C
oklch(44% 0.136 259.6)
- #6D4C00
#6D4C00
oklch(44.1% 0.091 79.9)
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 #1F4F9C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.028
- Dusk Blue #26538D ΔE 0.029
- Light Navy #155084 ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.050
- Denim Blue #3B5B92 ΔE 0.051
- Light Navy Blue #2E5A88 ΔE 0.052
- Blueberry #464196 ΔE 0.053
- Twilight #4E518B ΔE 0.061
Use #1F4F9C 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.