#256DD1
Closest named color: Royal Blue (#4169E1). oklch(54.7% 0.17 257.9), rgb(37, 109, 209).
Aa
White text reads best on this color (5.01:1).
About this color
#256DD1 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.170 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.035 away. White text reads best on it, at 5.01:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.18:1 |
| White text | 5.01:1 |
Values
| HEX | #256DD1 |
| RGB | rgb(37, 109, 209) |
| HSL | hsl(215, 70%, 48%) |
| OKLCH | oklch(54.7% 0.17 257.9) |
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 #256DD1 | 5.01:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #256DD1 | 4.18:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #256DD1 text on white | 5.01:1 | AA | Lc 74.2 | Content text, not long reading |
| #256DD1 text on black | 4.18:1 | AA large text | Lc -27.6 | 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
#4888E6
oklch(63% 0.157 258.1)
-
Step 600
600 (this color)
#256DD1
oklch(54.7% 0.17 257.9)
-
Step 700
700
#1B5DB8
oklch(49.1% 0.158 258)
-
Step 800
800
#194D95
oklch(42.8% 0.13 257.7)
-
Step 900
900
#1B4077
oklch(37.6% 0.103 258.4)
-
Step 950
950
#112645
oklch(27% 0.064 258.1)
#256DD1 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) | #3377D5 | 0.030 |
| Deuteranopia (no green cones) | #0068CF | 0.021 |
| Tritanopia (no blue cones) | #008595 | 0.129 |
| Achromatopsia (no color) | #6F6F6F | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256DD1
#256DD1
oklch(54.7% 0.17 257.9)
- #956700
#956700
oklch(54.8% 0.114 78)
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 #256DD1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.035
- Cerulean Blue #056EEE ΔE 0.045
- Mid Blue #276AB3 ΔE 0.047
- Windows Blue #3778BF ΔE 0.047
- Neon Blue #4361EE ΔE 0.058
- French Blue #436BAD ΔE 0.059
- Azul #1D5DEC ΔE 0.059
- Warm Blue #4B57DB ΔE 0.061
Use #256DD1 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.