#1F4E71
Closest named color: Deep Sea Blue (#015482). oklch(40.9% 0.078 244), rgb(31, 78, 113).
Aa
White text reads best on this color (8.79:1).
About this color
#1F4E71 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.078 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.031 away. White text reads best on it, at 8.79:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.38:1 |
| White text | 8.79:1 |
Values
| HEX | #1F4E71 |
| RGB | rgb(31, 78, 113) |
| HSL | hsl(206, 57%, 28%) |
| OKLCH | oklch(40.9% 0.078 244) |
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 #1F4E71 | 8.79:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #1F4E71 | 2.38:1 | Fails | Lc 14.1 | Not readable |
| #1F4E71 text on white | 8.79:1 | AAA | Lc 89.9 | Fine for body text |
| #1F4E71 text on black | 2.38:1 | Fails | Lc -12.4 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CCDBE9
oklch(88.4% 0.025 246.2)
-
Step 300
300
#A8C5DC
oklch(80.9% 0.045 242.1)
-
Step 400
400
#79A6CB
oklch(70.7% 0.073 243.9)
-
Step 500
500
#558FBE
oklch(63% 0.094 244.5)
-
Step 600
600
#3879AA
oklch(55.6% 0.101 243.9)
-
Step 700
700
#2A6692
oklch(49.2% 0.094 243.7)
-
Step 800
800 (this color)
#1F4E71
oklch(40.9% 0.078 244)
-
Step 900
900
#23455F
oklch(37.7% 0.06 243.4)
-
Step 950
950
#152838
oklch(26.9% 0.039 245.4)
#1F4E71 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) | #3E4F73 | 0.035 |
| Deuteranopia (no green cones) | #334770 | 0.027 |
| Tritanopia (no blue cones) | #00575A | 0.058 |
| Achromatopsia (no color) | #4A4A4A | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4E71
#1F4E71
oklch(40.9% 0.078 244)
- #674016
#674016
oklch(40.9% 0.078 64.1)
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 #1F4E71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.031
- Light Navy #155084 ΔE 0.031
- Dark Grey Blue #29465B ΔE 0.039
- Twilight Blue #0A437A ΔE 0.044
- Dusk Blue #26538D ΔE 0.048
- Charcoal #264653 ΔE 0.051
- Light Navy Blue #2E5A88 ΔE 0.052
- Deep Teal #00555A ΔE 0.054
Use #1F4E71 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.