#1F4F98
Closest named color: Cobalt (#1E488F). oklch(43.7% 0.13 258.9), rgb(31, 79, 152).
Aa
White text reads best on this color (7.98:1).
About this color
#1F4F98 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.130 and its hue 259°. 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 7.98:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.63:1 |
| White text | 7.98:1 |
Values
| HEX | #1F4F98 |
| RGB | rgb(31, 79, 152) |
| HSL | hsl(216, 66%, 36%) |
| OKLCH | oklch(43.7% 0.13 258.9) |
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 #1F4F98 | 7.98:1 | AAA | Lc -92.0 | Preferred for body text |
| Black text on #1F4F98 | 2.63:1 | Fails | Lc 16.7 | Dividers and decoration only |
| #1F4F98 text on white | 7.98:1 | AAA | Lc 87.3 | Fine for body text |
| #1F4F98 text on black | 2.63:1 | Fails | Lc -14.9 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A3C2F2
oklch(80.8% 0.076 259)
-
Step 400
400
#71A1EC
oklch(70.6% 0.122 259)
-
Step 500
500
#4B88E6
oklch(63.1% 0.156 258.8)
-
Step 600
600
#2D6FD4
oklch(55.5% 0.169 259)
-
Step 700
700
#1F5DB8
oklch(49.2% 0.157 258.6)
-
Step 800
800 (this color)
#1F4F98
oklch(43.7% 0.13 258.9)
-
Step 900
900
#1D4077
oklch(37.7% 0.102 259.2)
-
Step 950
950
#122645
oklch(27% 0.064 258.9)
#1F4F98 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) | #27579B | 0.025 |
| Deuteranopia (no green cones) | #024B97 | 0.020 |
| Tritanopia (no blue cones) | #00606C | 0.100 |
| Achromatopsia (no color) | #515151 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4F98
#1F4F98
oklch(43.7% 0.13 258.9)
- #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 #1F4F98, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.024
- Dusk Blue #26538D ΔE 0.024
- Light Navy #155084 ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.048
- Denim Blue #3B5B92 ΔE 0.049
- Blueberry #464196 ΔE 0.053
- Twilight #4E518B ΔE 0.059
Use #1F4F98 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.