#255DDF
Closest named color: Azul (#1D5DEC). oklch(52.5% 0.207 263.4), rgb(37, 93, 223).
Aa
White text reads best on this color (5.66:1).
About this color
#255DDF is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.207 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Azul (#1D5DEC), ΔE 0.020 away. White text reads best on it, at 5.66:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.207) |
| Temperature | cool |
| Nearest name | Azul (#1D5DEC) |
| Black text | 3.70:1 |
| White text | 5.66:1 |
Values
| HEX | #255DDF |
| RGB | rgb(37, 93, 223) |
| HSL | hsl(222, 74%, 51%) |
| OKLCH | oklch(52.5% 0.207 263.4) |
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 #255DDF | 5.66:1 | AA | Lc -82.9 | Fine for body text |
| Black text on #255DDF | 3.70:1 | AA large text | Lc 26.5 | Dividers and decoration only |
| #255DDF text on white | 5.66:1 | AA | Lc 77.6 | Fine for body text |
| #255DDF text on black | 3.70:1 | AA large text | Lc -24.2 | 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
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C8DAFC
oklch(88.6% 0.051 263.2)
-
Step 300
300
#A1C1FE
oklch(81% 0.094 263)
-
Step 400
400
#6F9EFD
oklch(70.8% 0.149 263.2)
-
Step 500
500
#4A82FB
oklch(63.2% 0.19 263.3)
-
Step 600
600 (this color)
#255DDF
oklch(52.5% 0.207 263.4)
-
Step 700
700
#2155CC
oklch(49.2% 0.193 263.2)
-
Step 800
800
#1D46A4
oklch(42.6% 0.159 263.4)
-
Step 900
900
#1D3C82
oklch(37.6% 0.124 263.6)
-
Step 950
950
#11244C
oklch(27% 0.078 263.1)
#255DDF 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) | #0070E3 | 0.045 |
| Deuteranopia (no green cones) | #005FDD | 0.014 |
| Tritanopia (no blue cones) | #007E95 | 0.159 |
| Achromatopsia (no color) | #676767 | 0.207 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255DDF
#255DDF
oklch(52.5% 0.207 263.4)
- #886300
#886300
oklch(52.4% 0.108 82.9)
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 #255DDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Azul #1D5DEC ΔE 0.020
- Warm Blue #4B57DB ΔE 0.037
- Neon Blue #4361EE ΔE 0.038
- Royal Blue #4169E1 ΔE 0.041
- Cerulean Blue #056EEE ΔE 0.045
- Bright Blue #0165FC ΔE 0.048
- Electric Blue #0652FF ΔE 0.055
- Blue Blue #2242C7 ΔE 0.073
Use #255DDF 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.