#1F587C
Closest named color: Deep Sea Blue (#015482). oklch(44.1% 0.083 240.4), rgb(31, 88, 124).
Aa
White text reads best on this color (7.64:1).
About this color
#1F587C is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.083 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.023 away. White text reads best on it, at 7.64:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.74:1 |
| White text | 7.64:1 |
Values
| HEX | #1F587C |
| RGB | rgb(31, 88, 124) |
| HSL | hsl(203, 60%, 30%) |
| OKLCH | oklch(44.1% 0.083 240.4) |
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 #1F587C | 7.64:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #1F587C | 2.74:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #1F587C text on white | 7.64:1 | AAA | Lc 86.3 | Fine for body text |
| #1F587C text on black | 2.74:1 | Fails | Lc -15.8 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A5C5DD
oklch(80.8% 0.048 240.6)
-
Step 400
400
#73A7CD
oklch(70.6% 0.078 241)
-
Step 500
500
#4C91C0
oklch(63.1% 0.1 240.6)
-
Step 600
600
#2B7AAC
oklch(55.5% 0.108 240.8)
-
Step 700
700
#1C6794
oklch(49.1% 0.101 240.5)
-
Step 800
800 (this color)
#1F587C
oklch(44.1% 0.083 240.4)
-
Step 900
900
#1D4661
oklch(37.8% 0.065 240.4)
-
Step 950
950
#122939
oklch(27% 0.042 241)
#1F587C 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) | #47587E | 0.043 |
| Deuteranopia (no green cones) | #3B4F7B | 0.036 |
| Tritanopia (no blue cones) | #006165 | 0.056 |
| Achromatopsia (no color) | #535353 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F587C
#1F587C
oklch(44.1% 0.083 240.4)
- #74471D
#74471D
oklch(44.2% 0.083 60.6)
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 #1F587C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.023
- Light Navy Blue #2E5A88 ΔE 0.025
- Light Navy #155084 ΔE 0.032
- Dusk Blue #26538D ΔE 0.036
- YInMn Blue #415A77 ΔE 0.036
- Petrol #005F6A ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.047
- Denim #3B638C ΔE 0.050
Use #1F587C 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.