#2550AB
Closest named color: Cobalt (#1E488F). oklch(45.6% 0.154 262.8), rgb(37, 80, 171).
Aa
White text reads best on this color (7.46:1).
About this color
#2550AB is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.154 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.050 away. White text reads best on it, at 7.46:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.81:1 |
| White text | 7.46:1 |
Values
| HEX | #2550AB |
| RGB | rgb(37, 80, 171) |
| HSL | hsl(221, 64%, 41%) |
| OKLCH | oklch(45.6% 0.154 262.8) |
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 #2550AB | 7.46:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #2550AB | 2.81:1 | Fails | Lc 18.6 | Dividers and decoration only |
| #2550AB text on white | 7.46:1 | AAA | Lc 85.5 | Fine for body text |
| #2550AB text on black | 2.81:1 | Fails | Lc -16.6 | 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 800.
-
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
#C8DAFB
oklch(88.5% 0.05 262.6)
-
Step 300
300
#A2C1FB
oklch(80.9% 0.089 262.7)
-
Step 400
400
#709EFA
oklch(70.7% 0.144 263.1)
-
Step 500
500
#4A83F7
oklch(63.1% 0.184 262.6)
-
Step 600
600
#2E69E6
oklch(55.6% 0.2 262.7)
-
Step 700
700
#2256C8
oklch(49.1% 0.186 262.9)
-
Step 800
800 (this color)
#2550AB
oklch(45.6% 0.154 262.8)
-
Step 900
900
#1D3D80
oklch(37.7% 0.12 262.8)
-
Step 950
950
#11244B
oklch(26.9% 0.077 262.8)
#2550AB 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) | #0C5BAE | 0.029 |
| Deuteranopia (no green cones) | #004FA9 | 0.020 |
| Tritanopia (no blue cones) | #006675 | 0.121 |
| Achromatopsia (no color) | #555555 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2550AB
#2550AB
oklch(45.6% 0.154 262.8)
- #705100
#705100
oklch(45.6% 0.094 83)
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 #2550AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.050
- Dusk Blue #26538D ΔE 0.051
- Blue Blue #2242C7 ΔE 0.056
- Blueberry #464196 ΔE 0.058
- Sapphire #2138AB ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.060
- Light Navy #155084 ΔE 0.066
- Light Navy Blue #2E5A88 ΔE 0.068
Use #2550AB 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.