#231ADD
Closest named color: Ultramarine Blue (#1805DB). oklch(42.8% 0.266 268.6), rgb(35, 26, 221).
Aa
White text reads best on this color (9.27:1).
About this color
#231ADD is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.266 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Ultramarine Blue (#1805DB), ΔE 0.021 away. White text reads best on it, at 9.27:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.266) |
| Temperature | cool |
| Nearest name | Ultramarine Blue (#1805DB) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #231ADD |
| RGB | rgb(35, 26, 221) |
| HSL | hsl(243, 79%, 48%) |
| OKLCH | oklch(42.8% 0.266 268.6) |
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 #231ADD | 9.27:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #231ADD | 2.26:1 | Fails | Lc 14.7 | Not readable |
| #231ADD text on white | 9.27:1 | AAA | Lc 89.3 | Fine for body text |
| #231ADD text on black | 2.26:1 | Fails | Lc -13.0 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A7BFFF
oklch(81% 0.095 268.4)
-
Step 400
400
#799AFF
oklch(70.6% 0.153 268.6)
-
Step 500
500
#597DFF
oklch(63.2% 0.197 268.6)
-
Step 600
600
#3D5AFF
oklch(55.6% 0.245 268.8)
-
Step 700
700
#2C30FF
oklch(49.1% 0.287 268.6)
-
Step 800
800 (this color)
#231ADD
oklch(42.8% 0.266 268.6)
-
Step 900
900
#1C25AD
oklch(37.8% 0.208 268.6)
-
Step 950
950
#0F1965
oklch(27% 0.132 268.8)
#231ADD 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) | #0051E2 | 0.085 |
| Deuteranopia (no green cones) | #003DDA | 0.045 |
| Tritanopia (no blue cones) | #005F83 | 0.199 |
| Achromatopsia (no color) | #474747 | 0.268 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #231ADD
#231ADD
oklch(42.8% 0.266 268.6)
- #634C00
#634C00
oklch(42.9% 0.088 88.6)
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 #231ADD, closest first.
No curated palette has a color within ΔE 0.04 of #231ADD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ultramarine Blue #1805DB ΔE 0.021
- Pure Blue #0203E2 ΔE 0.031
- True Blue #010FCC ΔE 0.044
- Strong Blue #0C06F7 ΔE 0.045
- Primary Blue #0804F9 ΔE 0.048
- Rich Blue #021BF9 ΔE 0.049
- Medium Blue #0000CD ΔE 0.049
- Blue #0000FF ΔE 0.058
Use #231ADD 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.