#256BBF
Closest named color: Mid Blue (#276AB3). oklch(53% 0.149 255.4), rgb(37, 107, 191).
Aa
White text reads best on this color (5.33:1).
About this color
#256BBF is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.149 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.019 away. White text reads best on it, at 5.33:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.93:1 |
| White text | 5.33:1 |
Values
| HEX | #256BBF |
| RGB | rgb(37, 107, 191) |
| HSL | hsl(213, 68%, 45%) |
| OKLCH | oklch(53% 0.149 255.4) |
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 #256BBF | 5.33:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #256BBF | 3.93:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #256BBF text on white | 5.33:1 | AA | Lc 76.1 | Fine for body text |
| #256BBF text on black | 3.93:1 | AA large text | Lc -25.6 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#C9DBF2
oklch(88.5% 0.037 254.6)
-
Step 300
300
#A4C3EC
oklch(80.9% 0.067 255.5)
-
Step 400
400
#73A3E2
oklch(70.7% 0.106 255.6)
-
Step 500
500
#4C8BDA
oklch(63.1% 0.136 255.1)
-
Step 600
600 (this color)
#256BBF
oklch(53% 0.149 255.4)
-
Step 700
700
#2060AD
oklch(49.1% 0.139 255.5)
-
Step 800
800
#1D4F8C
oklch(42.8% 0.114 255.4)
-
Step 900
900
#1E4270
oklch(37.8% 0.089 255.7)
-
Step 950
950
#122741
oklch(27% 0.056 254.8)
#256BBF 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) | #4072C2 | 0.032 |
| Deuteranopia (no green cones) | #2064BD | 0.020 |
| Tritanopia (no blue cones) | #007F8B | 0.113 |
| Achromatopsia (no color) | #6B6B6B | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256BBF
#256BBF
oklch(53% 0.149 255.4)
- #906100
#906100
oklch(53% 0.111 75.9)
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 #256BBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.019
- French Blue #436BAD ΔE 0.036
- Windows Blue #3778BF ΔE 0.041
- Flat Blue #3C73A8 ΔE 0.050
- Nice Blue #107AB0 ΔE 0.052
- Muted Blue #3B719F ΔE 0.059
- Royal Blue #4169E1 ΔE 0.059
- Ocean Blue #03719C ΔE 0.064
Use #256BBF 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.