#031BE2
Closest named color: Pure Blue (#0203E2). oklch(42.7% 0.276 264.4), rgb(3, 27, 226).
Aa
White text reads best on this color (9.29:1).
About this color
#031BE2 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.276 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Pure Blue (#0203E2), ΔE 0.015 away. White text reads best on it, at 9.29:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.276) |
| Temperature | cool |
| Nearest name | Pure Blue (#0203E2) |
| Black text | 2.25:1 |
| White text | 9.29:1 |
Values
| HEX | #031BE2 |
| RGB | rgb(3, 27, 226) |
| HSL | hsl(234, 97%, 45%) |
| OKLCH | oklch(42.7% 0.276 264.4) |
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 #031BE2 | 9.29:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #031BE2 | 2.25:1 | Fails | Lc 15.0 | Dividers and decoration only |
| #031BE2 text on white | 9.29:1 | AAA | Lc 89.0 | Fine for body text |
| #031BE2 text on black | 2.25:1 | Fails | Lc -13.2 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4B80FF
oklch(63.1% 0.197 264.4)
-
Step 600
600
#265FFF
oklch(55.6% 0.244 264.4)
-
Step 700
700
#0738FF
oklch(49.2% 0.287 264.4)
-
Step 800
800 (this color)
#031BE2
oklch(42.7% 0.276 264.4)
-
Step 900
900
#0426B1
oklch(37.7% 0.216 264.4)
-
Step 950
950
#041A67
oklch(27% 0.136 264.5)
#031BE2 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) | #0052E7 | 0.089 |
| Deuteranopia (no green cones) | #003BDF | 0.042 |
| Tritanopia (no blue cones) | #006286 | 0.206 |
| Achromatopsia (no color) | #474747 | 0.278 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031BE2
#031BE2
oklch(42.7% 0.276 264.4)
- #654A00
#654A00
oklch(42.7% 0.087 84.5)
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 #031BE2, closest first.
No curated palette has a color within ΔE 0.04 of #031BE2.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Pure Blue #0203E2 ΔE 0.015
- Ultramarine Blue #1805DB ΔE 0.020
- Strong Blue #0C06F7 ΔE 0.032
- Primary Blue #0804F9 ΔE 0.036
- Rich Blue #021BF9 ΔE 0.037
- True Blue #010FCC ΔE 0.041
- Medium Blue #0000CD ΔE 0.045
- Blue #0000FF ΔE 0.045
Use #031BE2 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.