#F33F37
Closest named color: Orangey Red (#FA4224). oklch(63.8% 0.217 27.8), rgb(243, 63, 55).
Aa
Black text reads best on this color (5.57:1).
About this color
#F33F37 is a medium-light, vivid red. In OKLCH its lightness is 64%, its chroma 0.217 and its hue 28°. Its hue sits on the warm side of the wheel. The nearest named color is Orangey Red (#FA4224), ΔE 0.021 away. Black text reads best on it, at 5.57:1.
| Hue family | Reds |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.217) |
| Temperature | warm |
| Nearest name | Orangey Red (#FA4224) |
| Black text | 5.57:1 |
| White text | 3.76:1 |
Values
| HEX | #F33F37 |
| RGB | rgb(243, 63, 55) |
| HSL | hsl(3, 89%, 58%) |
| OKLCH | oklch(63.8% 0.217 27.8) |
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 #F33F37 | 3.76:1 | AA large text | Lc -69.2 | Content text, not long reading |
| Black text on #F33F37 | 5.57:1 | AA | Lc 40.4 | Non-text elements, placeholder text |
| #F33F37 text on white | 3.76:1 | AA large text | Lc 63.7 | Content text, not long reading |
| #F33F37 text on black | 5.57:1 | AA | Lc -38.0 | 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
#FEE3DF
oklch(93.7% 0.03 27.8)
-
Step 200
200
#FECBC4
oklch(88.5% 0.059 27.4)
-
Step 300
300
#FEA69A
oklch(80.9% 0.106 28.1)
-
Step 400
400
#F87062
oklch(70.7% 0.17 28.1)
-
Step 500
500 (this color)
#F33F37
oklch(63.8% 0.217 27.8)
-
Step 600
600
#D90011
oklch(55.7% 0.227 27.8)
-
Step 700
700
#B8000C
oklch(49.2% 0.201 27.9)
-
Step 800
800
#980008
oklch(42.7% 0.175 27.8)
-
Step 900
900
#7C100F
oklch(37.8% 0.142 27.7)
-
Step 950
950
#490E0B
oklch(27% 0.089 27.7)
#F33F37 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) | #766A34 | 0.233 |
| Deuteranopia (no green cones) | #A2922F | 0.214 |
| Tritanopia (no blue cones) | #FF003F | 0.046 |
| Achromatopsia (no color) | #848484 | 0.219 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #F33F37
#F33F37
oklch(63.8% 0.217 27.8)
- #009DAE
#009DAE
oklch(63.7% 0.11 208.3)
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 #F33F37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Orangey Red #FA4224 ΔE 0.021
- Vermillion #F4320C ΔE 0.025
- Red Orange #FD3C06 ΔE 0.030
- Strawberry #FB2943 ΔE 0.031
- Light Red #FF474C ΔE 0.033
- Orangered #FE420F ΔE 0.033
- Imperial Red #E63946 ΔE 0.034
- Red Pantone #EF233C ΔE 0.035
Use #F33F37 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.