#1F2973
Closest named color: Midnight Blue (#191970). oklch(32.4% 0.127 271.4), rgb(31, 41, 115).
Aa
White text reads best on this color (12.93:1).
About this color
#1F2973 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.127 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Blue (#191970), ΔE 0.040 away. White text reads best on it, at 12.93:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Midnight Blue (#191970) |
| Black text | 1.62:1 |
| White text | 12.93:1 |
Values
| HEX | #1F2973 |
| RGB | rgb(31, 41, 115) |
| HSL | hsl(233, 58%, 29%) |
| OKLCH | oklch(32.4% 0.127 271.4) |
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 #1F2973 | 12.93:1 | AAA | Lc -102.0 | Preferred for body text |
| Black text on #1F2973 | 1.62:1 | Fails | Lc 0.0 | Not readable |
| #1F2973 text on white | 12.93:1 | AAA | Lc 98.7 | Preferred for body text |
| #1F2973 text on black | 1.62:1 | 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 900.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CCD8FD
oklch(88.5% 0.053 271.1)
-
Step 300
300
#AABEFF
oklch(81% 0.095 271)
-
Step 400
400
#7F99FF
oklch(70.8% 0.152 271.3)
-
Step 500
500
#627BFD
oklch(63.1% 0.194 271.6)
-
Step 600
600
#4B60EC
oklch(55.6% 0.211 271.3)
-
Step 700
700
#3D4ECD
oklch(49.1% 0.195 271.3)
-
Step 800
800
#3241A6
oklch(42.7% 0.162 271.3)
-
Step 900
900 (this color)
#1F2973
oklch(32.4% 0.127 271.4)
-
Step 950
950
#19224D
oklch(27.1% 0.08 271.2)
#1F2973 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) | #003575 | 0.036 |
| Deuteranopia (no green cones) | #002E72 | 0.027 |
| Tritanopia (no blue cones) | #003C49 | 0.103 |
| Achromatopsia (no color) | #313131 | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F2973
#1F2973
oklch(32.4% 0.127 271.4)
- #403200
#403200
oklch(32.3% 0.066 91.6)
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 #1F2973, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Blue #191970 ΔE 0.040
- Marine #042E60 ΔE 0.044
- Marine Blue #01386A ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.063
- Royal #0C1793 ΔE 0.067
- Twilight Blue #0A437A ΔE 0.071
- Dark Royal Blue #02066F ΔE 0.083
- Navy #000080 ΔE 0.083
Use #1F2973 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.