#1F4197
Closest named color: Cobalt (#1E488F). oklch(40.5% 0.147 264.4), rgb(31, 65, 151).
Aa
White text reads best on this color (9.28:1).
About this color
#1F4197 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.147 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.024 away. White text reads best on it, at 9.28:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.26:1 |
| White text | 9.28:1 |
Values
| HEX | #1F4197 |
| RGB | rgb(31, 65, 151) |
| HSL | hsl(223, 66%, 36%) |
| OKLCH | oklch(40.5% 0.147 264.4) |
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 #1F4197 | 9.28:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #1F4197 | 2.26:1 | Fails | Lc 13.0 | Not readable |
| #1F4197 text on white | 9.28:1 | AAA | Lc 90.9 | Preferred for body text |
| #1F4197 text on black | 2.26:1 | Fails | Lc -11.4 | 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 800.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A5C0F9
oklch(80.8% 0.086 264.8)
-
Step 400
400
#759EF6
oklch(70.7% 0.137 264.3)
-
Step 500
500
#5283F2
oklch(63.2% 0.175 264.1)
-
Step 600
600
#3869E1
oklch(55.6% 0.191 264.3)
-
Step 700
700
#2B56C3
oklch(49% 0.177 264.4)
-
Step 800
800 (this color)
#1F4197
oklch(40.5% 0.147 264.4)
-
Step 900
900
#223D7D
oklch(37.7% 0.114 264.4)
-
Step 950
950
#142449
oklch(26.9% 0.072 264.5)
#1F4197 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) | #004D9A | 0.032 |
| Deuteranopia (no green cones) | #004295 | 0.018 |
| Tritanopia (no blue cones) | #005665 | 0.115 |
| Achromatopsia (no color) | #474747 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4197
#1F4197
oklch(40.5% 0.147 264.4)
- #5E4500
#5E4500
oklch(40.7% 0.083 84.9)
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 #1F4197, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.024
- Sapphire #2138AB ΔE 0.039
- Blueberry #464196 ΔE 0.050
- Twilight Blue #0A437A ΔE 0.052
- Light Navy #155084 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.056
- Dusk Blue #26538D ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.068
Use #1F4197 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.