#256ED1
Closest named color: Royal Blue (#4169E1). oklch(54.9% 0.169 257.5), rgb(37, 110, 209).
Aa
White text reads best on this color (4.96:1).
About this color
#256ED1 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.169 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.036 away. White text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.22:1 |
| White text | 4.96:1 |
Values
| HEX | #256ED1 |
| RGB | rgb(37, 110, 209) |
| HSL | hsl(215, 70%, 48%) |
| OKLCH | oklch(54.9% 0.169 257.5) |
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 #256ED1 | 4.96:1 | AA | Lc -79.3 | Fine for body text |
| Black text on #256ED1 | 4.22:1 | AA large text | Lc 30.2 | Non-text elements, placeholder text |
| #256ED1 text on white | 4.96:1 | AA | Lc 73.8 | Content text, not long reading |
| #256ED1 text on black | 4.22:1 | AA large text | Lc -27.9 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
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
#A2C3F2
oklch(81% 0.076 257.2)
-
Step 400
400
#6FA2EC
oklch(70.7% 0.122 257.6)
-
Step 500
500
#4789E5
oklch(63.1% 0.155 257.2)
-
Step 600
600 (this color)
#256ED1
oklch(54.9% 0.169 257.5)
-
Step 700
700
#1A5DB7
oklch(49% 0.157 257.7)
-
Step 800
800
#184D94
oklch(42.7% 0.129 257.3)
-
Step 900
900
#1B4176
oklch(37.8% 0.1 257.4)
-
Step 950
950
#112645
oklch(27% 0.064 258.1)
#256ED1 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) | #3678D5 | 0.031 |
| Deuteranopia (no green cones) | #0069CF | 0.021 |
| Tritanopia (no blue cones) | #008695 | 0.129 |
| Achromatopsia (no color) | #707070 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256ED1
#256ED1
oklch(54.9% 0.169 257.5)
- #966700
#966700
oklch(54.9% 0.115 77.4)
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 #256ED1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.036
- Windows Blue #3778BF ΔE 0.045
- Cerulean Blue #056EEE ΔE 0.045
- Mid Blue #276AB3 ΔE 0.047
- French Blue #436BAD ΔE 0.058
- Neon Blue #4361EE ΔE 0.060
- Azul #1D5DEC ΔE 0.061
- Warm Blue #4B57DB ΔE 0.063
Use #256ED1 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.