#1F33C5
Closest named color: Blue Blue (#2242C7). oklch(42.5% 0.222 267.6), rgb(31, 51, 197).
Aa
White text reads best on this color (8.98:1).
About this color
#1F33C5 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.222 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.031 away. White text reads best on it, at 8.98:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.222) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.33:1 |
| White text | 8.98:1 |
Values
| HEX | #1F33C5 |
| RGB | rgb(31, 51, 197) |
| HSL | hsl(233, 73%, 45%) |
| OKLCH | oklch(42.5% 0.222 267.6) |
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 #1F33C5 | 8.98:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #1F33C5 | 2.33:1 | Fails | Lc 14.6 | Not readable |
| #1F33C5 text on white | 8.98:1 | AAA | Lc 89.4 | Fine for body text |
| #1F33C5 text on black | 2.33:1 | Fails | Lc -12.8 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#779BFF
oklch(70.7% 0.152 267.5)
-
Step 500
500
#567DFF
oklch(63% 0.198 267.8)
-
Step 600
600
#385CFF
oklch(55.7% 0.244 267.6)
-
Step 700
700
#273BF5
oklch(49.1% 0.268 267.6)
-
Step 800
800 (this color)
#1F33C5
oklch(42.5% 0.222 267.6)
-
Step 900
900
#1C319B
oklch(37.7% 0.173 267.7)
-
Step 950
950
#101F5B
oklch(27.1% 0.109 267.5)
#1F33C5 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) | #0051C9 | 0.062 |
| Deuteranopia (no green cones) | #0041C2 | 0.027 |
| Tritanopia (no blue cones) | #005E79 | 0.170 |
| Achromatopsia (no color) | #494949 | 0.223 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F33C5
#1F33C5
oklch(42.5% 0.222 267.6)
- #634B00
#634B00
oklch(42.6% 0.087 87.5)
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 #1F33C5, closest first.
No curated palette has a color within ΔE 0.04 of #1F33C5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.031
- Majorelle Blue #3F37C9 ΔE 0.042
- Sapphire #2138AB ΔE 0.042
- True Blue #010FCC ΔE 0.054
- Ultramarine Blue #1805DB ΔE 0.054
- Indigo Blue #3A18B1 ΔE 0.060
- Medium Blue #0000CD ΔE 0.062
- Pure Blue #0203E2 ΔE 0.065
Use #1F33C5 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.