#2D17DB
Closest named color: Ultramarine Blue (#1805DB). oklch(42.8% 0.263 271.1), rgb(45, 23, 219).
Aa
White text reads best on this color (9.30:1).
About this color
#2D17DB is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.263 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Ultramarine Blue (#1805DB), ΔE 0.029 away. White text reads best on it, at 9.30:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.263) |
| Temperature | cool |
| Nearest name | Ultramarine Blue (#1805DB) |
| Black text | 2.25:1 |
| White text | 9.30:1 |
Values
| HEX | #2D17DB |
| RGB | rgb(45, 23, 219) |
| HSL | hsl(247, 81%, 47%) |
| OKLCH | oklch(42.8% 0.263 271.1) |
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 #2D17DB | 9.30:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #2D17DB | 2.25:1 | Fails | Lc 14.6 | Not readable |
| #2D17DB text on white | 9.30:1 | AAA | Lc 89.3 | Fine for body text |
| #2D17DB text on black | 2.25:1 | Fails | Lc -12.9 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#AABEFF
oklch(81% 0.095 271)
-
Step 400
400
#7E99FF
oklch(70.7% 0.152 270.9)
-
Step 500
500
#607BFF
oklch(63.2% 0.197 271)
-
Step 600
600
#4658FF
oklch(55.6% 0.245 271)
-
Step 700
700
#382AFF
oklch(49.1% 0.288 271.2)
-
Step 800
800 (this color)
#2D17DB
oklch(42.8% 0.263 271.1)
-
Step 900
900
#2423AB
oklch(37.6% 0.205 271.2)
-
Step 950
950
#131864
oklch(26.9% 0.13 271)
#2D17DB 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) | #0050E0 | 0.085 |
| Deuteranopia (no green cones) | #003DD8 | 0.049 |
| Tritanopia (no blue cones) | #005D81 | 0.198 |
| Achromatopsia (no color) | #474747 | 0.265 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D17DB
#2D17DB
oklch(42.8% 0.263 271.1)
- #614D00
#614D00
oklch(42.9% 0.088 91.6)
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 #2D17DB, closest first.
No curated palette has a color within ΔE 0.04 of #2D17DB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ultramarine Blue #1805DB ΔE 0.029
- Pure Blue #0203E2 ΔE 0.042
- True Blue #010FCC ΔE 0.050
- Strong Blue #0C06F7 ΔE 0.053
- Medium Blue #0000CD ΔE 0.055
- Primary Blue #0804F9 ΔE 0.057
- Rich Blue #021BF9 ΔE 0.057
- Majorelle Blue #3F37C9 ΔE 0.057
Use #2D17DB 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.