#255AD0
Closest named color: Warm Blue (#4B57DB). oklch(50.6% 0.191 263.1), rgb(37, 90, 208).
Aa
White text reads best on this color (6.08:1).
About this color
#255AD0 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.191 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.041 away. White text reads best on it, at 6.08:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.191) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.45:1 |
| White text | 6.08:1 |
Values
| HEX | #255AD0 |
| RGB | rgb(37, 90, 208) |
| HSL | hsl(221, 70%, 48%) |
| OKLCH | oklch(50.6% 0.191 263.1) |
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 #255AD0 | 6.08:1 | AA | Lc -84.9 | Fine for body text |
| Black text on #255AD0 | 3.45:1 | AA large text | Lc 24.3 | Dividers and decoration only |
| #255AD0 text on white | 6.08:1 | AA | Lc 79.7 | Fine for body text |
| #255AD0 text on black | 3.45:1 | AA large text | Lc -22.1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C8DAFC
oklch(88.6% 0.051 263.2)
-
Step 300
300
#A1C1FD
oklch(80.9% 0.092 262.7)
-
Step 400
400
#6F9EFC
oklch(70.7% 0.147 263)
-
Step 500
500
#4982FA
oklch(63.1% 0.189 263)
-
Step 600
600
#2D68E9
oklch(55.7% 0.205 263)
-
Step 700
700 (this color)
#255AD0
oklch(50.6% 0.191 263.1)
-
Step 800
800
#1C47A4
oklch(42.8% 0.158 262.9)
-
Step 900
900
#1C3C82
oklch(37.6% 0.124 263.2)
-
Step 950
950
#11244C
oklch(27% 0.078 263.1)
#255AD0 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) | #006AD4 | 0.039 |
| Deuteranopia (no green cones) | #005BCE | 0.015 |
| Tritanopia (no blue cones) | #00788C | 0.149 |
| Achromatopsia (no color) | #626262 | 0.192 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255AD0
#255AD0
oklch(50.6% 0.191 263.1)
- #825E00
#825E00
oklch(50.6% 0.104 82.4)
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 #255AD0, closest first.
No curated palette has a color within ΔE 0.04 of #255AD0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.041
- Azul #1D5DEC ΔE 0.043
- Royal Blue #4169E1 ΔE 0.055
- Blue Blue #2242C7 ΔE 0.058
- Neon Blue #4361EE ΔE 0.058
- Cerulean Blue #056EEE ΔE 0.064
- Mid Blue #276AB3 ΔE 0.065
- Bright Blue #0165FC ΔE 0.071
Use #255AD0 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.