#FF0537
Closest named color: Neon Red (#FF073A). oklch(63.2% 0.254 23), rgb(255, 5, 55).
Aa
Black text reads best on this color (5.32:1).
About this color
#FF0537 is a medium-light, vivid red. In OKLCH its lightness is 63%, its chroma 0.254 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Neon Red (#FF073A), ΔE 0.003 away. Black text reads best on it, at 5.32:1.
| Hue family | Reds |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.254) |
| Temperature | warm |
| Nearest name | Neon Red (#FF073A) |
| Black text | 5.32:1 |
| White text | 3.94:1 |
Values
| HEX | #FF0537 |
| RGB | rgb(255, 5, 55) |
| HSL | hsl(348, 100%, 51%) |
| OKLCH | oklch(63.2% 0.254 23) |
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 #FF0537 | 3.94:1 | AA large text | Lc -69.4 | Content text, not long reading |
| Black text on #FF0537 | 5.32:1 | AA | Lc 40.2 | Non-text elements, placeholder text |
| #FF0537 text on white | 3.94:1 | AA large text | Lc 63.9 | Content text, not long reading |
| #FF0537 text on black | 5.32:1 | 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
#FFF2F1
oklch(97.1% 0.014 22.8)
-
Step 100
100
#FFE2E0
oklch(93.6% 0.032 22.5)
-
Step 200
200
#FFCAC7
oklch(88.5% 0.061 22.1)
-
Step 300
300
#FFA4A0
oklch(80.8% 0.109 22.5)
-
Step 400
400
#FF6868
oklch(70.7% 0.185 23)
-
Step 500
500 (this color)
#FF0537
oklch(63.2% 0.254 23)
-
Step 600
600
#D8002C
oklch(55.7% 0.225 23.1)
-
Step 700
700
#B70024
oklch(49.2% 0.198 23)
-
Step 800
800
#97001C
oklch(42.7% 0.172 22.9)
-
Step 900
900
#7F0016
oklch(37.6% 0.152 22.9)
-
Step 950
950
#4E030B
oklch(27.1% 0.105 23.1)
#FF0537 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) | #6B6135 | 0.281 |
| Deuteranopia (no green cones) | #A2912C | 0.255 |
| Tritanopia (no blue cones) | #FF0024 | 0.014 |
| Achromatopsia (no color) | #808080 | 0.256 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #FF0537
#FF0537
oklch(63.2% 0.254 23)
- #009CA6
#009CA6
oklch(63.1% 0.107 202.8)
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 #FF0537, closest first.
No curated palette has a color within ΔE 0.04 of #FF0537.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Red #FF073A ΔE 0.003
- Strawberry #FB2943 ΔE 0.017
- Pinky Red #FC2647 ΔE 0.018
- Cherry Red #F7022A ΔE 0.019
- Bright Red #FF000D ΔE 0.025
- Fire Engine Red #FE0002 ΔE 0.028
- Red #FF0000 ΔE 0.029
- Red Pantone #EF233C ΔE 0.030
Use #FF0537 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.