#2548A3
Closest named color: Cobalt (#1E488F). oklch(43.3% 0.153 264.8), rgb(37, 72, 163).
Aa
White text reads best on this color (8.28:1).
About this color
#2548A3 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.153 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.034 away. White text reads best on it, at 8.28:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.53:1 |
| White text | 8.28:1 |
Values
| HEX | #2548A3 |
| RGB | rgb(37, 72, 163) |
| HSL | hsl(223, 63%, 39%) |
| OKLCH | oklch(43.3% 0.153 264.8) |
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 #2548A3 | 8.28:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #2548A3 | 2.53:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #2548A3 text on white | 8.28:1 | AAA | Lc 88.1 | Fine for body text |
| #2548A3 text on black | 2.53:1 | Fails | Lc -14.0 | Not readable |
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
#C9D9FB
oklch(88.4% 0.05 265.4)
-
Step 300
300
#A4C0FB
oklch(80.8% 0.089 264.8)
-
Step 400
400
#749DF9
oklch(70.6% 0.143 264.8)
-
Step 500
500
#5181F6
oklch(63% 0.183 264.9)
-
Step 600
600
#3767E5
oklch(55.5% 0.199 264.8)
-
Step 700
700
#2A55C7
oklch(49.1% 0.184 264.7)
-
Step 800
800 (this color)
#2548A3
oklch(43.3% 0.153 264.8)
-
Step 900
900
#213C80
oklch(37.6% 0.12 264.9)
-
Step 950
950
#14244B
oklch(27.1% 0.075 265)
#2548A3 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) | #0054A6 | 0.033 |
| Deuteranopia (no green cones) | #0049A1 | 0.021 |
| Tritanopia (no blue cones) | #005E6E | 0.120 |
| Achromatopsia (no color) | #4E4E4E | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2548A3
#2548A3
oklch(43.3% 0.153 264.8)
- #674C00
#674C00
oklch(43.4% 0.089 85)
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 #2548A3, closest first.
No curated palette has a color within ΔE 0.04 of #2548A3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.034
- Sapphire #2138AB ΔE 0.041
- Blueberry #464196 ΔE 0.046
- Dusk Blue #26538D ΔE 0.050
- Blue Blue #2242C7 ΔE 0.059
- Light Navy #155084 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.061
- Denim Blue #3B5B92 ΔE 0.070
Use #2548A3 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.