#1F4588
Closest named color: Cobalt (#1E488F). oklch(40.2% 0.12 260.8), rgb(31, 69, 136).
Aa
White text reads best on this color (9.27:1).
About this color
#1F4588 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.120 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.014 away. White text reads best on it, at 9.27:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #1F4588 |
| RGB | rgb(31, 69, 136) |
| HSL | hsl(218, 63%, 33%) |
| OKLCH | oklch(40.2% 0.12 260.8) |
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 #1F4588 | 9.27:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #1F4588 | 2.26:1 | Fails | Lc 12.9 | Not readable |
| #1F4588 text on white | 9.27:1 | AAA | Lc 91.0 | Preferred for body text |
| #1F4588 text on black | 2.26:1 | Fails | Lc -11.3 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CBDAF4
oklch(88.5% 0.039 261.5)
-
Step 300
300
#A7C2EF
oklch(81% 0.07 260.6)
-
Step 400
400
#78A1E7
oklch(70.8% 0.113 260.7)
-
Step 500
500
#5588DF
oklch(63.2% 0.143 260.4)
-
Step 600
600
#3A6FCD
oklch(55.5% 0.156 260.9)
-
Step 700
700
#2C5DB2
oklch(49.2% 0.145 260.6)
-
Step 800
800 (this color)
#1F4588
oklch(40.2% 0.12 260.8)
-
Step 900
900
#234073
oklch(37.7% 0.094 260.8)
-
Step 950
950
#152643
oklch(27% 0.059 260.5)
#1F4588 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) | #204C8A | 0.020 |
| Deuteranopia (no green cones) | #004387 | 0.020 |
| Tritanopia (no blue cones) | #005560 | 0.094 |
| Achromatopsia (no color) | #474747 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4588
#1F4588
oklch(40.2% 0.12 260.8)
- #5F4200
#5F4200
oklch(40.1% 0.083 80.2)
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 #1F4588, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.014
- Twilight Blue #0A437A ΔE 0.029
- Light Navy #155084 ΔE 0.034
- Dusk Blue #26538D ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.055
- Blueberry #464196 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.066
Use #1F4588 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.