#1F2970
Closest named color: Midnight Blue (#191970). oklch(32.1% 0.122 271.5), rgb(31, 41, 112).
Aa
White text reads best on this color (13.04:1).
About this color
#1F2970 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.122 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Blue (#191970), ΔE 0.039 away. White text reads best on it, at 13.04:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Midnight Blue (#191970) |
| Black text | 1.60:1 |
| White text | 13.04:1 |
Values
| HEX | #1F2970 |
| RGB | rgb(31, 41, 112) |
| HSL | hsl(233, 57%, 28%) |
| OKLCH | oklch(32.1% 0.122 271.5) |
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 #1F2970 | 13.04:1 | AAA | Lc -102.2 | Preferred for body text |
| Black text on #1F2970 | 1.60:1 | Fails | Lc 0.0 | Not readable |
| #1F2970 text on white | 13.04:1 | AAA | Lc 98.9 | Preferred for body text |
| #1F2970 text on black | 1.60:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#AABDFF
oklch(80.8% 0.096 271.7)
-
Step 400
400
#7F98FF
oklch(70.6% 0.153 271.7)
-
Step 500
500
#617AFF
oklch(63% 0.198 271.6)
-
Step 600
600
#4857FF
oklch(55.6% 0.245 271.6)
-
Step 700
700
#3929FF
oklch(49% 0.288 271.5)
-
Step 800
800
#2E22D3
oklch(42.7% 0.248 271.6)
-
Step 900
900
#2528A5
oklch(37.7% 0.193 271.4)
-
Step 950
950 (this color)
#1F2970
oklch(32.1% 0.122 271.5)
#1F2970 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) | #003572 | 0.036 |
| Deuteranopia (no green cones) | #002D6F | 0.027 |
| Tritanopia (no blue cones) | #003B48 | 0.099 |
| Achromatopsia (no color) | #313131 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F2970
#1F2970
oklch(32.1% 0.122 271.5)
- #3F3100
#3F3100
oklch(32% 0.065 91.4)
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 #1F2970, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Blue #191970 ΔE 0.039
- Marine #042E60 ΔE 0.040
- Marine Blue #01386A ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.059
- Royal #0C1793 ΔE 0.071
- Twilight Blue #0A437A ΔE 0.072
- Dark Royal Blue #02066F ΔE 0.082
- Deep Blue #040273 ΔE 0.083
Use #1F2970 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.