#FF1503
Closest named color: Red (#FF0000). oklch(63.2% 0.254 29.8), rgb(255, 21, 3).
Aa
Black text reads best on this color (5.36:1).
About this color
#FF1503 is a medium-light, vivid red. In OKLCH its lightness is 63%, its chroma 0.254 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Red (#FF0000), ΔE 0.007 away. Black text reads best on it, at 5.36:1.
| Hue family | Reds |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.254) |
| Temperature | warm |
| Nearest name | Red (#FF0000) |
| Black text | 5.36:1 |
| White text | 3.91:1 |
Values
| HEX | #FF1503 |
| RGB | rgb(255, 21, 3) |
| HSL | hsl(4, 100%, 51%) |
| OKLCH | oklch(63.2% 0.254 29.8) |
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 #FF1503 | 3.91:1 | AA large text | Lc -69.4 | Content text, not long reading |
| Black text on #FF1503 | 5.36:1 | AA | Lc 40.2 | Non-text elements, placeholder text |
| #FF1503 text on white | 3.91:1 | AA large text | Lc 63.9 | Content text, not long reading |
| #FF1503 text on black | 5.36:1 | AA | Lc -37.8 | 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
#FFA697
oklch(81% 0.108 30.1)
-
Step 400
400
#FF6A57
oklch(70.7% 0.185 29.7)
-
Step 500
500 (this color)
#FF1503
oklch(63.2% 0.254 29.8)
-
Step 600
600
#D80D00
oklch(55.7% 0.225 29.8)
-
Step 700
700
#B60900
oklch(49% 0.198 29.8)
-
Step 800
800
#970600
oklch(42.7% 0.172 29.8)
-
Step 900
900
#7F0400
oklch(37.7% 0.152 29.8)
-
Step 950
950
#4E0402
oklch(27% 0.105 29.4)
#FF1503 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) | #6F6100 | 0.277 |
| Deuteranopia (no green cones) | #A49100 | 0.245 |
| Tritanopia (no blue cones) | #FF001A | 0.012 |
| Achromatopsia (no color) | #818181 | 0.255 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #FF1503
#FF1503
oklch(63.2% 0.254 29.8)
- #009BAE
#009BAE
oklch(63.2% 0.109 210)
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 #FF1503, closest first.
No curated palette has a color within ΔE 0.04 of #FF1503.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Red #FF0000 ΔE 0.007
- Fire Engine Red #FE0002 ΔE 0.008
- Bright Red #FF000D ΔE 0.008
- Vermillion #F4320C ΔE 0.025
- Cherry Red #F7022A ΔE 0.027
- Red Orange #FD3C06 ΔE 0.031
- Neon Red #FF073A ΔE 0.033
- Orangey Red #FA4224 ΔE 0.036
Use #FF1503 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.