#3D00DB
Closest named color: Ultramarine Blue (#1805DB). oklch(42.7% 0.266 276.2), rgb(61, 0, 219).
Aa
White text reads best on this color (9.45:1).
About this color
#3D00DB is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.266 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Ultramarine Blue (#1805DB), ΔE 0.048 away. White text reads best on it, at 9.45:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.266) |
| Temperature | cool |
| Nearest name | Ultramarine Blue (#1805DB) |
| Black text | 2.22:1 |
| White text | 9.45:1 |
Values
| HEX | #3D00DB |
| RGB | rgb(61, 0, 219) |
| HSL | hsl(257, 100%, 43%) |
| OKLCH | oklch(42.7% 0.266 276.2) |
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 #3D00DB | 9.45:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #3D00DB | 2.22:1 | Fails | Lc 15.0 | Not readable |
| #3D00DB text on white | 9.45:1 | AAA | Lc 89.0 | Fine for body text |
| #3D00DB text on black | 2.22:1 | Fails | Lc -13.2 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FF
oklch(93.7% 0.03 275.6)
-
Step 200
200
#CFD7FF
oklch(88.6% 0.056 276.3)
-
Step 300
300
#B0BCFF
oklch(81% 0.096 276.2)
-
Step 400
400
#8895FF
oklch(70.6% 0.155 276.4)
-
Step 500
500
#6D76FF
oklch(63% 0.2 276.2)
-
Step 600
600
#5751FF
oklch(55.5% 0.248 276.2)
-
Step 700
700
#4A1CFF
oklch(49.1% 0.291 276.2)
-
Step 800
800 (this color)
#3D00DB
oklch(42.7% 0.266 276.2)
-
Step 900
900
#311CAB
oklch(37.7% 0.207 276.4)
-
Step 950
950
#1B1564
oklch(27% 0.131 276.3)
#3D00DB 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) | #004EE0 | 0.095 |
| Deuteranopia (no green cones) | #003DD8 | 0.068 |
| Tritanopia (no blue cones) | #005980 | 0.202 |
| Achromatopsia (no color) | #464646 | 0.268 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D00DB
#3D00DB
oklch(42.7% 0.266 276.2)
- #5D4E00
#5D4E00
oklch(42.6% 0.088 96.3)
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 #3D00DB, closest first.
No curated palette has a color within ΔE 0.04 of #3D00DB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ultramarine Blue #1805DB ΔE 0.048
- Violet Blue #510AC9 ΔE 0.049
- Majorelle Blue #3F37C9 ΔE 0.056
- Blue Purple #5A06EF ΔE 0.061
- Pure Blue #0203E2 ΔE 0.062
- True Blue #010FCC ΔE 0.067
- Indigo Blue #3A18B1 ΔE 0.067
- Purple Blue #5D21D0 ΔE 0.069
Use #3D00DB 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.