#AD421A
Closest named color: Sinopia (#BB3E03). oklch(52.1% 0.149 39.1), rgb(173, 66, 26).
Aa
White text reads best on this color (5.88:1).
About this color
#AD421A is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.149 and its hue 39°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.027 away. White text reads best on it, at 5.88:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.149) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.57:1 |
| White text | 5.88:1 |
Values
| HEX | #AD421A |
| RGB | rgb(173, 66, 26) |
| HSL | hsl(16, 74%, 39%) |
| OKLCH | oklch(52.1% 0.149 39.1) |
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 #AD421A | 5.88:1 | AA | Lc -83.8 | Fine for body text |
| Black text on #AD421A | 3.57:1 | AA large text | Lc 25.5 | Dividers and decoration only |
| #AD421A text on white | 5.88:1 | AA | Lc 78.6 | Fine for body text |
| #AD421A text on black | 3.57:1 | AA large text | Lc -23.2 | 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 700.
-
Step 50
50
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F7E6E0
oklch(93.7% 0.02 40.5)
-
Step 200
200
#F2D1C6
oklch(88.5% 0.04 39.3)
-
Step 300
300
#EAB19E
oklch(80.8% 0.072 39.2)
-
Step 400
400
#DE8669
oklch(70.7% 0.116 39)
-
Step 500
500
#D26540
oklch(63.1% 0.147 39.1)
-
Step 600
600
#BD481C
oklch(55.5% 0.16 39)
-
Step 700
700 (this color)
#AD421A
oklch(52.1% 0.149 39.1)
-
Step 800
800
#843010
oklch(42.6% 0.123 39.2)
-
Step 900
900
#6B2C16
oklch(37.8% 0.096 39.1)
-
Step 950
950
#3F1A0E
oklch(27% 0.062 38.5)
#AD421A 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) | #615513 | 0.147 |
| Deuteranopia (no green cones) | #7B6D15 | 0.134 |
| Tritanopia (no blue cones) | #BF263A | 0.067 |
| Achromatopsia (no color) | #646464 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AD421A
#AD421A
oklch(52.1% 0.149 39.1)
- #00758E
#00758E
oklch(52% 0.094 219.6)
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 #AD421A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.027
- Burnt Umber #A0450E ΔE 0.028
- Rusty Red #AF2F0D ΔE 0.031
- Cinnamon #AC4F06 ΔE 0.032
- Russet #A13905 ΔE 0.033
- Sienna #A0522D ΔE 0.037
- Brick #A03623 ΔE 0.040
- Burnt Siena #B75203 ΔE 0.045
Use #AD421A 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.