#255AD9
Closest named color: Azul (#1D5DEC). oklch(51.4% 0.203 263.6), rgb(37, 90, 217).
Aa
White text reads best on this color (5.92:1).
About this color
#255AD9 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.203 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Azul (#1D5DEC), ΔE 0.030 away. White text reads best on it, at 5.92:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.203) |
| Temperature | cool |
| Nearest name | Azul (#1D5DEC) |
| Black text | 3.54:1 |
| White text | 5.92:1 |
Values
| HEX | #255AD9 |
| RGB | rgb(37, 90, 217) |
| HSL | hsl(222, 71%, 50%) |
| OKLCH | oklch(51.4% 0.203 263.6) |
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 #255AD9 | 5.92:1 | AA | Lc -84.2 | Fine for body text |
| Black text on #255AD9 | 3.54:1 | AA large text | Lc 25.1 | Dividers and decoration only |
| #255AD9 text on white | 5.92:1 | AA | Lc 78.9 | Fine for body text |
| #255AD9 text on black | 3.54:1 | AA large text | Lc -22.9 | 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 700.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C7DAFE
oklch(88.6% 0.054 263.2)
-
Step 300
300
#A1C0FF
oklch(80.8% 0.096 264.1)
-
Step 400
400
#6E9DFF
oklch(70.6% 0.153 263.6)
-
Step 500
500
#4881FF
oklch(63.2% 0.197 263.5)
-
Step 600
600
#2B65F0
oklch(55.6% 0.218 263.6)
-
Step 700
700 (this color)
#255AD9
oklch(51.4% 0.203 263.6)
-
Step 800
800
#1B45A9
oklch(42.8% 0.167 263.6)
-
Step 900
900
#1B3B86
oklch(37.7% 0.132 263.8)
-
Step 950
950
#10234E
oklch(26.8% 0.083 263.8)
#255AD9 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) | #006CDD | 0.043 |
| Deuteranopia (no green cones) | #005CD7 | 0.015 |
| Tritanopia (no blue cones) | #007A91 | 0.155 |
| Achromatopsia (no color) | #646464 | 0.203 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255AD9
#255AD9
oklch(51.4% 0.203 263.6)
- #846100
#846100
oklch(51.5% 0.106 83.8)
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 #255AD9, closest first.
No curated palette has a color within ΔE 0.04 of #255AD9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Azul #1D5DEC ΔE 0.030
- Warm Blue #4B57DB ΔE 0.037
- Neon Blue #4361EE ΔE 0.048
- Royal Blue #4169E1 ΔE 0.049
- Cerulean Blue #056EEE ΔE 0.056
- Bright Blue #0165FC ΔE 0.058
- Electric Blue #0652FF ΔE 0.061
- Blue Blue #2242C7 ΔE 0.063
Use #255AD9 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.