#256CE1
Closest named color: Royal Blue (#4169E1). oklch(55.6% 0.192 260.2), rgb(37, 108, 225).
Aa
White text reads best on this color (4.87:1).
About this color
#256CE1 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.192 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.021 away. White text reads best on it, at 4.87:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.192) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.31:1 |
| White text | 4.87:1 |
Values
| HEX | #256CE1 |
| RGB | rgb(37, 108, 225) |
| HSL | hsl(217, 76%, 51%) |
| OKLCH | oklch(55.6% 0.192 260.2) |
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 #256CE1 | 4.87:1 | AA | Lc -78.6 | Fine for body text |
| Black text on #256CE1 | 4.31:1 | AA large text | Lc 30.9 | Non-text elements, placeholder text |
| #256CE1 text on white | 4.87:1 | AA | Lc 73.2 | Content text, not long reading |
| #256CE1 text on black | 4.31:1 | AA large text | Lc -28.5 | 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 600.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A0C2F9
oklch(80.9% 0.087 259.9)
-
Step 400
400
#6CA0F6
oklch(70.7% 0.138 260)
-
Step 500
500
#4585F2
oklch(63% 0.177 260.3)
-
Step 600
600 (this color)
#256CE1
oklch(55.6% 0.192 260.2)
-
Step 700
700
#1859C3
oklch(49% 0.178 260.2)
-
Step 800
800
#164A9E
oklch(42.8% 0.147 259.9)
-
Step 900
900
#193F7D
oklch(37.8% 0.114 259.8)
-
Step 950
950
#102549
oklch(26.9% 0.072 260.4)
#256CE1 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) | #137AE5 | 0.035 |
| Deuteranopia (no green cones) | #0069DF | 0.017 |
| Tritanopia (no blue cones) | #00899C | 0.148 |
| Achromatopsia (no color) | #717171 | 0.192 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256CE1
#256CE1
oklch(55.6% 0.192 260.2)
- #966A00
#966A00
oklch(55.5% 0.115 79.9)
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 #256CE1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.021
- Cerulean Blue #056EEE ΔE 0.022
- Neon Blue #4361EE ΔE 0.038
- Azul #1D5DEC ΔE 0.041
- Bright Blue #0165FC ΔE 0.047
- Clear Blue #247AFD ΔE 0.053
- Warm Blue #4B57DB ΔE 0.054
- Windows Blue #3778BF ΔE 0.067
Use #256CE1 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.