#2F51CD
Closest named color: Blue Blue (#2242C7). oklch(49% 0.196 266.9), rgb(47, 81, 205).
Aa
White text reads best on this color (6.60:1).
About this color
#2F51CD is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.196 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.040 away. White text reads best on it, at 6.60:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 3.17:1 |
| White text | 6.60:1 |
Values
| HEX | #2F51CD |
| RGB | rgb(47, 81, 205) |
| HSL | hsl(227, 63%, 49%) |
| OKLCH | oklch(49% 0.196 266.9) |
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 #2F51CD | 6.60:1 | AA | Lc -87.1 | Fine for body text |
| Black text on #2F51CD | 3.17:1 | AA large text | Lc 22.0 | Dividers and decoration only |
| #2F51CD text on white | 6.60:1 | AA | Lc 82.0 | Fine for body text |
| #2F51CD text on black | 3.17:1 | AA large text | Lc -19.9 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#C9D9FD
oklch(88.5% 0.053 266.4)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#769BFF
oklch(70.7% 0.152 267.2)
-
Step 500
500
#557FFD
oklch(63.2% 0.193 266.9)
-
Step 600
600
#3C64EC
oklch(55.7% 0.21 266.8)
-
Step 700
700 (this color)
#2F51CD
oklch(49% 0.196 266.9)
-
Step 800
800
#2744A6
oklch(42.8% 0.162 266.7)
-
Step 900
900
#233A84
oklch(37.6% 0.128 267)
-
Step 950
950
#15234D
oklch(27% 0.08 267.1)
#2F51CD 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) | #0064D1 | 0.046 |
| Deuteranopia (no green cones) | #0056CB | 0.025 |
| Tritanopia (no blue cones) | #007187 | 0.154 |
| Achromatopsia (no color) | #5D5D5D | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F51CD
#2F51CD
oklch(49% 0.196 266.9)
- #795C00
#795C00
oklch(49.1% 0.1 87.1)
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 #2F51CD, closest first.
No curated palette has a color within ΔE 0.04 of #2F51CD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.040
- Warm Blue #4B57DB ΔE 0.043
- Majorelle Blue #3F37C9 ΔE 0.054
- Azul #1D5DEC ΔE 0.055
- Blue With A Hint Of Purple #533CC6 ΔE 0.059
- Blurple #5539CC ΔE 0.063
- Neon Blue #4361EE ΔE 0.069
- Royal Blue #4169E1 ΔE 0.070
Use #2F51CD 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.