#900717
Closest named color: Brick Red (#8F1402). oklch(41.5% 0.164 24.8), rgb(144, 7, 23).
Aa
White text reads best on this color (9.42:1).
About this color
#900717 is a dark, vivid red. In OKLCH its lightness is 41%, its chroma 0.164 and its hue 25°. Its hue sits on the warm side of the wheel. The nearest named color is Brick Red (#8F1402), ΔE 0.020 away. White text reads best on it, at 9.42:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | vivid (0.164) |
| Temperature | warm |
| Nearest name | Brick Red (#8F1402) |
| Black text | 2.22:1 |
| White text | 9.42:1 |
Values
| HEX | #900717 |
| RGB | rgb(144, 7, 23) |
| HSL | hsl(353, 91%, 30%) |
| OKLCH | oklch(41.5% 0.164 24.8) |
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 #900717 | 9.42:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #900717 | 2.22:1 | Fails | Lc 14.3 | Not readable |
| #900717 text on white | 9.42:1 | AAA | Lc 89.6 | Fine for body text |
| #900717 text on black | 2.22:1 | Fails | Lc -12.6 | Not readable |
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 800.
-
Step 50
50
#FEF2F1
oklch(97% 0.013 23.2)
-
Step 100
100
#FCE3E1
oklch(93.6% 0.028 23.2)
-
Step 200
200
#FBCCC8
oklch(88.5% 0.054 23.9)
-
Step 300
300
#F9A8A2
oklch(80.9% 0.097 24.1)
-
Step 400
400
#F1766F
oklch(70.8% 0.153 25)
-
Step 500
500
#E84949
oklch(63.1% 0.196 24.7)
-
Step 600
600
#D31B2B
oklch(55.5% 0.213 24.7)
-
Step 700
700
#B7031E
oklch(49.2% 0.198 24.7)
-
Step 800
800 (this color)
#900717
oklch(41.5% 0.164 24.8)
-
Step 900
900
#771A1C
oklch(37.7% 0.127 24.8)
-
Step 950
950
#461111
oklch(26.9% 0.081 24.4)
#900717 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) | #3A3416 | 0.181 |
| Deuteranopia (no green cones) | #5A5010 | 0.164 |
| Tritanopia (no blue cones) | #9F0011 | 0.032 |
| Achromatopsia (no color) | #464646 | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #900717
#900717
oklch(41.5% 0.164 24.8)
- #00565E
#00565E
oklch(41.4% 0.071 205.7)
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 #900717, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brick Red #8F1402 ΔE 0.020
- Dark Red #8B0000 ΔE 0.020
- Blood Red #980002 ΔE 0.021
- Deep Red #9A0200 ΔE 0.025
- Carmine #9D0216 ΔE 0.028
- Auburn #9B2226 ΔE 0.040
- Red Wine #8C0034 ΔE 0.040
- Maroon #800000 ΔE 0.041
Use #900717 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.