#1F577E
Closest named color: Deep Sea Blue (#015482). oklch(43.9% 0.086 242.9), rgb(31, 87, 126).
Aa
White text reads best on this color (7.71:1).
About this color
#1F577E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.086 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.019 away. White text reads best on it, at 7.71:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.72:1 |
| White text | 7.71:1 |
Values
| HEX | #1F577E |
| RGB | rgb(31, 87, 126) |
| HSL | hsl(205, 61%, 31%) |
| OKLCH | oklch(43.9% 0.086 242.9) |
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 #1F577E | 7.71:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #1F577E | 2.72:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #1F577E text on white | 7.71:1 | AAA | Lc 86.5 | Fine for body text |
| #1F577E text on black | 2.72:1 | Fails | Lc -15.6 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEB
oklch(88.6% 0.028 243.1)
-
Step 300
300
#A5C5DF
oklch(80.9% 0.05 242.9)
-
Step 400
400
#73A7CF
oklch(70.7% 0.081 242.4)
-
Step 500
500
#4C90C3
oklch(63% 0.104 243.1)
-
Step 600
600
#2B7AAF
oklch(55.7% 0.112 242.4)
-
Step 700
700
#1D6697
oklch(49.1% 0.105 243.2)
-
Step 800
800 (this color)
#1F577E
oklch(43.9% 0.086 242.9)
-
Step 900
900
#1D4562
oklch(37.6% 0.067 242.9)
-
Step 950
950
#12293A
oklch(27.1% 0.043 242.6)
#1F577E 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) | #455880 | 0.041 |
| Deuteranopia (no green cones) | #384F7D | 0.031 |
| Tritanopia (no blue cones) | #006165 | 0.061 |
| Achromatopsia (no color) | #535353 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F577E
#1F577E
oklch(43.9% 0.086 242.9)
- #734617
#734617
oklch(43.8% 0.086 62.7)
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 #1F577E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.019
- Light Navy Blue #2E5A88 ΔE 0.023
- Light Navy #155084 ΔE 0.027
- Dusk Blue #26538D ΔE 0.031
- YInMn Blue #415A77 ΔE 0.038
- Denim Blue #3B5B92 ΔE 0.045
- Petrol #005F6A ΔE 0.049
- Denim #3B638C ΔE 0.051
Use #1F577E 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.