#0000FF
Named color: Blue. oklch(45.2% 0.313 264.1), rgb(0, 0, 255).
Aa
White text reads best on this color (8.59:1).
About this color
#0000FF is a medium-dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.313 and its hue 264°. Its hue sits on the cool side of the wheel. It is the named color Blue. White text reads best on it, at 8.59:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.313) |
| Temperature | cool |
| Nearest name | Blue |
| Black text | 2.44:1 |
| White text | 8.59:1 |
Values
| HEX | #0000FF |
| RGB | rgb(0, 0, 255) |
| HSL | hsl(240, 100%, 50%) |
| OKLCH | oklch(45.2% 0.313 264.1) |
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 #0000FF | 8.59:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #0000FF | 2.44:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #0000FF text on white | 8.59:1 | AAA | Lc 85.8 | Fine for body text |
| #0000FF text on black | 2.44:1 | Fails | Lc -16.2 | Dividers and decoration only |
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
#C7DAFF
oklch(88.6% 0.055 263.7)
-
Step 300
300
#A1C0FF
oklch(80.8% 0.096 264.1)
-
Step 400
400
#6F9DFF
oklch(70.7% 0.152 263.9)
-
Step 500
500
#4A80FF
oklch(63.1% 0.198 264.2)
-
Step 600
600
#235FFF
oklch(55.6% 0.245 264.1)
-
Step 700
700
#0038FF
oklch(49.1% 0.287 264)
-
Step 800
800 (this color)
#0000FF
oklch(45.2% 0.313 264.1)
-
Step 900
900
#0024B4
oklch(37.7% 0.222 264)
-
Step 950
950
#001570
oklch(27.1% 0.154 263.9)
#0000FF 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) | #0059FF | 0.106 |
| Deuteranopia (no green cones) | #003DFB | 0.053 |
| Tritanopia (no blue cones) | #006B96 | 0.231 |
| Achromatopsia (no color) | #4C4C4C | 0.315 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0000FF
#0000FF
oklch(45.2% 0.313 264.1)
- #6E5000
#6E5000
oklch(45.1% 0.093 83.5)
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 #0000FF, closest first.
No curated palette has a color within ΔE 0.04 of #0000FF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Primary Blue #0804F9 ΔE 0.010
- Strong Blue #0C06F7 ΔE 0.013
- Rich Blue #021BF9 ΔE 0.014
- Vivid Blue #152EFF ΔE 0.038
- Pure Blue #0203E2 ΔE 0.047
- Vibrant Blue #0339F8 ΔE 0.047
- Ultramarine Blue #1805DB ΔE 0.059
- Light Royal Blue #3A2EFE ΔE 0.065
Use #0000FF 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.