#FF0000
Named color: Red. oklch(62.8% 0.258 29.2), rgb(255, 0, 0).
Aa
Black text reads best on this color (5.25:1).
About this color
#FF0000 is a medium-light, vivid red. In OKLCH its lightness is 63%, its chroma 0.258 and its hue 29°. Its hue sits on the warm side of the wheel. It is the named color Red. Black text reads best on it, at 5.25:1.
| Hue family | Reds |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.258) |
| Temperature | warm |
| Nearest name | Red |
| Black text | 5.25:1 |
| White text | 3.99:1 |
Values
| HEX | #FF0000 |
| RGB | rgb(255, 0, 0) |
| HSL | hsl(0, 100%, 50%) |
| OKLCH | oklch(62.8% 0.258 29.2) |
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 #FF0000 | 3.99:1 | AA large text | Lc -69.6 | Content text, not long reading |
| Black text on #FF0000 | 5.25:1 | AA | Lc 40.0 | Non-text elements, placeholder text |
| #FF0000 text on white | 3.99:1 | AA large text | Lc 64.1 | Content text, not long reading |
| #FF0000 text on black | 5.25:1 | AA | Lc -37.5 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#FFF2F0
oklch(97.1% 0.014 28)
-
Step 100
100
#FFE2DD
oklch(93.5% 0.033 29.4)
-
Step 200
200
#FFCBC2
oklch(88.5% 0.061 29.7)
-
Step 300
300
#FFA698
oklch(81% 0.108 29.4)
-
Step 400
400
#FF6A58
oklch(70.7% 0.185 29.4)
-
Step 500
500 (this color)
#FF0000
oklch(62.8% 0.258 29.2)
-
Step 600
600
#D90000
oklch(55.6% 0.228 29.2)
-
Step 700
700
#B80000
oklch(49.1% 0.202 29.2)
-
Step 800
800
#980000
oklch(42.7% 0.175 29.2)
-
Step 900
900
#800000
oklch(37.7% 0.155 29.2)
-
Step 950
950
#4E0302
oklch(26.9% 0.106 29)
#FF0000 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) | #6D5F00 | 0.282 |
| Deuteranopia (no green cones) | #A39000 | 0.249 |
| Tritanopia (no blue cones) | #FF000F | 0.004 |
| Achromatopsia (no color) | #7F7F7F | 0.260 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #FF0000
#FF0000
oklch(62.8% 0.258 29.2)
- #009AAC
#009AAC
oklch(62.8% 0.108 209.3)
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 #FF0000, closest first.
No curated palette has a color within ΔE 0.04 of #FF0000.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Fire Engine Red #FE0002 ΔE 0.002
- Bright Red #FF000D ΔE 0.003
- Cherry Red #F7022A ΔE 0.024
- Vermillion #F4320C ΔE 0.029
- Neon Red #FF073A ΔE 0.031
- Red Orange #FD3C06 ΔE 0.038
- Tomato Red #EC2D01 ΔE 0.038
- Strawberry #FB2943 ΔE 0.038
Use #FF0000 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.