#2558D9
Closest named color: Azul (#1D5DEC). oklch(51% 0.205 264), rgb(37, 88, 217).
Aa
White text reads best on this color (6.04:1).
About this color
#2558D9 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.205 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Azul (#1D5DEC), ΔE 0.031 away. White text reads best on it, at 6.04:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.205) |
| Temperature | cool |
| Nearest name | Azul (#1D5DEC) |
| Black text | 3.47:1 |
| White text | 6.04:1 |
Values
| HEX | #2558D9 |
| RGB | rgb(37, 88, 217) |
| HSL | hsl(223, 71%, 50%) |
| OKLCH | oklch(51% 0.205 264) |
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 #2558D9 | 6.04:1 | AA | Lc -84.7 | Fine for body text |
| Black text on #2558D9 | 3.47:1 | AA large text | Lc 24.6 | Dividers and decoration only |
| #2558D9 text on white | 6.04:1 | AA | Lc 79.5 | Fine for body text |
| #2558D9 text on black | 3.47:1 | AA large text | Lc -22.4 | 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
#C7DAFF
oklch(88.6% 0.055 263.7)
-
Step 300
300
#A1C0FF
oklch(80.8% 0.096 264.1)
-
Step 400
400
#6F9DFF
oklch(70.7% 0.152 263.9)
-
Step 500
500
#4980FF
oklch(63% 0.198 264)
-
Step 600
600
#2C64F2
oklch(55.6% 0.221 264.1)
-
Step 700
700 (this color)
#2558D9
oklch(51% 0.205 264)
-
Step 800
800
#1C44AA
oklch(42.7% 0.17 264.1)
-
Step 900
900
#1B3B87
oklch(37.7% 0.133 263.9)
-
Step 950
950
#10234F
oklch(26.9% 0.085 264)
#2558D9 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) | #006BDD | 0.045 |
| Deuteranopia (no green cones) | #005BD7 | 0.015 |
| Tritanopia (no blue cones) | #007990 | 0.158 |
| Achromatopsia (no color) | #636363 | 0.205 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2558D9
#2558D9
oklch(51% 0.205 264)
- #826000
#826000
oklch(51% 0.105 84.3)
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 #2558D9, closest first.
No curated palette has a color within ΔE 0.04 of #2558D9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Azul #1D5DEC ΔE 0.031
- Warm Blue #4B57DB ΔE 0.038
- Neon Blue #4361EE ΔE 0.050
- Royal Blue #4169E1 ΔE 0.053
- Blue Blue #2242C7 ΔE 0.058
- Cerulean Blue #056EEE ΔE 0.059
- Electric Blue #0652FF ΔE 0.060
- Bright Blue #0165FC ΔE 0.060
Use #2558D9 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.