#1F5271
Closest named color: Deep Sea Blue (#015482). oklch(41.9% 0.075 238.9), rgb(31, 82, 113).
Aa
White text reads best on this color (8.38:1).
About this color
#1F5271 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.075 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.029 away. White text reads best on it, at 8.38:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.50:1 |
| White text | 8.38:1 |
Values
| HEX | #1F5271 |
| RGB | rgb(31, 82, 113) |
| HSL | hsl(203, 57%, 28%) |
| OKLCH | oklch(41.9% 0.075 238.9) |
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 #1F5271 | 8.38:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #1F5271 | 2.50:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #1F5271 text on white | 8.38:1 | AAA | Lc 88.7 | Fine for body text |
| #1F5271 text on black | 2.50:1 | Fails | Lc -13.5 | 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
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CBDCE8
oklch(88.5% 0.025 238.4)
-
Step 300
300
#A8C5DA
oklch(80.9% 0.043 239.6)
-
Step 400
400
#78A7C8
oklch(70.7% 0.07 239.6)
-
Step 500
500
#5291BA
oklch(63.1% 0.09 238.9)
-
Step 600
600
#347BA6
oklch(55.7% 0.097 238.6)
-
Step 700
700
#26678E
oklch(49.1% 0.09 239)
-
Step 800
800 (this color)
#1F5271
oklch(41.9% 0.075 238.9)
-
Step 900
900
#21465D
oklch(37.8% 0.058 238.2)
-
Step 950
950
#142937
oklch(27% 0.038 239.4)
#1F5271 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) | #445272 | 0.041 |
| Deuteranopia (no green cones) | #384A70 | 0.033 |
| Tritanopia (no blue cones) | #005A5D | 0.051 |
| Achromatopsia (no color) | #4D4D4D | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F5271
#1F5271
oklch(41.9% 0.075 238.9)
- #6B421F
#6B421F
oklch(42% 0.075 59)
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 #1F5271, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.029
- Light Navy #155084 ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.046
- Petrol #005F6A ΔE 0.047
- YInMn Blue #415A77 ΔE 0.047
- Deep Teal #00555A ΔE 0.047
- Dusk Blue #26538D ΔE 0.048
Use #1F5271 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.