#256DE2
Closest named color: Cerulean Blue (#056EEE). oklch(55.9% 0.192 260), rgb(37, 109, 226).
Aa
White text reads best on this color (4.81:1).
About this color
#256DE2 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 Cerulean Blue (#056EEE), ΔE 0.020 away. White text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.192) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.36:1 |
| White text | 4.81:1 |
Values
| HEX | #256DE2 |
| RGB | rgb(37, 109, 226) |
| HSL | hsl(217, 77%, 52%) |
| OKLCH | oklch(55.9% 0.192 260) |
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 #256DE2 | 4.81:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #256DE2 | 4.36:1 | AA large text | Lc 31.3 | Non-text elements, placeholder text |
| #256DE2 text on white | 4.81:1 | AA | Lc 72.8 | Content text, not long reading |
| #256DE2 text on black | 4.36:1 | AA large text | Lc -28.9 | 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 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
#4485F2
oklch(63% 0.177 260.1)
-
Step 600
600 (this color)
#256DE2
oklch(55.9% 0.192 260)
-
Step 700
700
#1759C3
oklch(49% 0.178 260.1)
-
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
#0F2549
oklch(26.9% 0.073 259.8)
#256DE2 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) | #167BE6 | 0.035 |
| Deuteranopia (no green cones) | #006AE0 | 0.017 |
| Tritanopia (no blue cones) | #008A9D | 0.148 |
| Achromatopsia (no color) | #727272 | 0.192 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256DE2
#256DE2
oklch(55.9% 0.192 260)
- #976B00
#976B00
oklch(55.9% 0.116 80.2)
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 #256DE2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.020
- Royal Blue #4169E1 ΔE 0.022
- Neon Blue #4361EE ΔE 0.039
- Azul #1D5DEC ΔE 0.043
- Bright Blue #0165FC ΔE 0.046
- Clear Blue #247AFD ΔE 0.050
- Warm Blue #4B57DB ΔE 0.056
- Windows Blue #3778BF ΔE 0.066
Use #256DE2 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.