#256FD4
Closest named color: Royal Blue (#4169E1). oklch(55.3% 0.171 257.7), rgb(37, 111, 212).
Aa
White text reads best on this color (4.88:1).
About this color
#256FD4 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.171 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.033 away. White text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.30:1 |
| White text | 4.88:1 |
Values
| HEX | #256FD4 |
| RGB | rgb(37, 111, 212) |
| HSL | hsl(215, 70%, 49%) |
| OKLCH | oklch(55.3% 0.171 257.7) |
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 #256FD4 | 4.88:1 | AA | Lc -78.7 | Fine for body text |
| Black text on #256FD4 | 4.30:1 | AA large text | Lc 30.8 | Non-text elements, placeholder text |
| #256FD4 text on white | 4.88:1 | AA | Lc 73.3 | Content text, not long reading |
| #256FD4 text on black | 4.30:1 | AA large text | Lc -28.4 | 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
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF6
oklch(88.6% 0.043 257.1)
-
Step 300
300
#A2C3F3
oklch(81% 0.077 257.7)
-
Step 400
400
#6EA2ED
oklch(70.7% 0.124 257.5)
-
Step 500
500
#4688E7
oklch(63% 0.159 257.8)
-
Step 600
600 (this color)
#256FD4
oklch(55.3% 0.171 257.7)
-
Step 700
700
#185DB9
oklch(49.1% 0.16 257.7)
-
Step 800
800
#174D95
oklch(42.8% 0.131 257.3)
-
Step 900
900
#1A4077
oklch(37.6% 0.104 258)
-
Step 950
950
#102646
oklch(27% 0.066 257.9)
#256FD4 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) | #3579D8 | 0.031 |
| Deuteranopia (no green cones) | #006AD2 | 0.021 |
| Tritanopia (no blue cones) | #008797 | 0.130 |
| Achromatopsia (no color) | #717171 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256FD4
#256FD4
oklch(55.3% 0.171 257.7)
- #976800
#976800
oklch(55.2% 0.115 77.6)
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 #256FD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.033
- Cerulean Blue #056EEE ΔE 0.041
- Windows Blue #3778BF ΔE 0.046
- Mid Blue #276AB3 ΔE 0.052
- Neon Blue #4361EE ΔE 0.057
- Azul #1D5DEC ΔE 0.060
- French Blue #436BAD ΔE 0.062
- Warm Blue #4B57DB ΔE 0.064
Use #256FD4 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.