#1F1F53
Closest named color: Dark Indigo (#1F0954). oklch(27.4% 0.092 278.4), rgb(31, 31, 83).
Aa
White text reads best on this color (15.22:1).
About this color
#1F1F53 is a dark, moderately saturated blue. In OKLCH its lightness is 27%, its chroma 0.092 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.048 away. White text reads best on it, at 15.22:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.37:1 |
| White text | 15.22:1 |
Values
| HEX | #1F1F53 |
| RGB | rgb(31, 31, 83) |
| HSL | hsl(240, 46%, 22%) |
| OKLCH | oklch(27.4% 0.092 278.4) |
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 #1F1F53 | 15.22:1 | AAA | Lc -104.7 | Preferred for body text |
| Black text on #1F1F53 | 1.37:1 | Fails | Lc 0.0 | Not readable |
| #1F1F53 text on white | 15.22:1 | AAA | Lc 101.9 | Preferred for body text |
| #1F1F53 text on black | 1.37:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E5E8FF
oklch(93.6% 0.031 279.9)
-
Step 200
200
#D0D6FF
oklch(88.5% 0.057 278.6)
-
Step 300
300
#B2BBFF
oklch(81% 0.097 278.2)
-
Step 400
400
#8C94FF
oklch(70.7% 0.155 278.4)
-
Step 500
500
#7374FF
oklch(63.1% 0.202 278.6)
-
Step 600
600
#5E50FC
oklch(55.6% 0.244 278.5)
-
Step 700
700
#4E3FDB
oklch(49.1% 0.226 278.4)
-
Step 800
800
#3F36B1
oklch(42.7% 0.187 278.2)
-
Step 900
900
#34318C
oklch(37.6% 0.146 278.2)
-
Step 950
950 (this color)
#1F1F53
oklch(27.4% 0.092 278.4)
#1F1F53 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) | #002855 | 0.038 |
| Deuteranopia (no green cones) | #002352 | 0.036 |
| Tritanopia (no blue cones) | #022B35 | 0.080 |
| Achromatopsia (no color) | #262626 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F1F53
#1F1F53
oklch(27.4% 0.092 278.4)
- #2F2700
#2F2700
oklch(27.4% 0.056 97.3)
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 #1F1F53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.048
- Marine #042E60 ΔE 0.050
- Oxford Blue #1B263B ΔE 0.053
- Midnight Blue #191970 ΔE 0.054
- Space Cadet #2B2D42 ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.066
- Dark #1B2431 ΔE 0.069
- Navy Blue #001146 ΔE 0.069
Use #1F1F53 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.