#256BE4
Closest named color: Cerulean Blue (#056EEE). oklch(55.6% 0.197 260.7), rgb(37, 107, 228).
Aa
White text reads best on this color (4.88:1).
About this color
#256BE4 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.197 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.018 away. White text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.197) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.30:1 |
| White text | 4.88:1 |
Values
| HEX | #256BE4 |
| RGB | rgb(37, 107, 228) |
| HSL | hsl(218, 78%, 52%) |
| OKLCH | oklch(55.6% 0.197 260.7) |
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 #256BE4 | 4.88:1 | AA | Lc -78.6 | Fine for body text |
| Black text on #256BE4 | 4.30:1 | AA large text | Lc 30.9 | Non-text elements, placeholder text |
| #256BE4 text on white | 4.88:1 | AA | Lc 73.2 | Content text, not long reading |
| #256BE4 text on black | 4.30:1 | AA large text | Lc -28.5 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A0C2FA
oklch(80.9% 0.088 260.2)
-
Step 400
400
#6CA0F8
oklch(70.8% 0.141 260.4)
-
Step 500
500
#4485F5
oklch(63.2% 0.181 260.5)
-
Step 600
600 (this color)
#256BE4
oklch(55.6% 0.197 260.7)
-
Step 700
700
#1858C6
oklch(49.1% 0.183 260.8)
-
Step 800
800
#1649A0
oklch(42.7% 0.151 260.6)
-
Step 900
900
#193E7F
oklch(37.7% 0.118 260.7)
-
Step 950
950
#0F254A
oklch(27% 0.074 260.2)
#256BE4 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) | #007AE8 | 0.037 |
| Deuteranopia (no green cones) | #0069E2 | 0.015 |
| Tritanopia (no blue cones) | #00899D | 0.151 |
| Achromatopsia (no color) | #717171 | 0.197 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256BE4
#256BE4
oklch(55.6% 0.197 260.7)
- #966B00
#966B00
oklch(55.7% 0.115 80.8)
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 #256BE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.018
- Royal Blue #4169E1 ΔE 0.021
- Neon Blue #4361EE ΔE 0.034
- Azul #1D5DEC ΔE 0.037
- Bright Blue #0165FC ΔE 0.041
- Clear Blue #247AFD ΔE 0.051
- Warm Blue #4B57DB ΔE 0.053
- Electric Blue #0652FF ΔE 0.072
Use #256BE4 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.