#256EDD
Closest named color: Royal Blue (#4169E1). oklch(55.7% 0.184 259.2), rgb(37, 110, 221).
Aa
White text reads best on this color (4.82:1).
About this color
#256EDD is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.184 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.024 away. White text reads best on it, at 4.82:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.184) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.35:1 |
| White text | 4.82:1 |
Values
| HEX | #256EDD |
| RGB | rgb(37, 110, 221) |
| HSL | hsl(216, 73%, 51%) |
| OKLCH | oklch(55.7% 0.184 259.2) |
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 #256EDD | 4.82:1 | AA | Lc -78.3 | Fine for body text |
| Black text on #256EDD | 4.35:1 | AA large text | Lc 31.2 | Non-text elements, placeholder text |
| #256EDD text on white | 4.82:1 | AA | Lc 72.9 | Content text, not long reading |
| #256EDD text on black | 4.35:1 | AA large text | Lc -28.8 | 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
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DAF8
oklch(88.4% 0.046 259.5)
-
Step 300
300
#A1C2F7
oklch(80.9% 0.084 259.8)
-
Step 400
400
#6DA1F3
oklch(70.8% 0.133 259.2)
-
Step 500
500
#4587EE
oklch(63.2% 0.169 259.1)
-
Step 600
600 (this color)
#256EDD
oklch(55.7% 0.184 259.2)
-
Step 700
700
#175BBF
oklch(49.1% 0.171 259.1)
-
Step 800
800
#164B9B
oklch(42.8% 0.142 259.1)
-
Step 900
900
#193F7B
oklch(37.6% 0.111 259.3)
-
Step 950
950
#102648
oklch(27.1% 0.069 258.9)
#256EDD 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) | #257BE1 | 0.034 |
| Deuteranopia (no green cones) | #006ADB | 0.019 |
| Tritanopia (no blue cones) | #00899B | 0.141 |
| Achromatopsia (no color) | #727272 | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256EDD
#256EDD
oklch(55.7% 0.184 259.2)
- #976A00
#976A00
oklch(55.7% 0.116 79.3)
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 #256EDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.024
- Cerulean Blue #056EEE ΔE 0.027
- Neon Blue #4361EE ΔE 0.045
- Azul #1D5DEC ΔE 0.049
- Bright Blue #0165FC ΔE 0.054
- Clear Blue #247AFD ΔE 0.055
- Warm Blue #4B57DB ΔE 0.059
- Windows Blue #3778BF ΔE 0.059
Use #256EDD 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.