#2545A9
Closest named color: Sapphire (#2138AB). oklch(43.1% 0.165 266), rgb(37, 69, 169).
Aa
White text reads best on this color (8.39:1).
About this color
#2545A9 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.165 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.032 away. White text reads best on it, at 8.39:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.50:1 |
| White text | 8.39:1 |
Values
| HEX | #2545A9 |
| RGB | rgb(37, 69, 169) |
| HSL | hsl(225, 64%, 40%) |
| OKLCH | oklch(43.1% 0.165 266) |
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 #2545A9 | 8.39:1 | AAA | Lc -93.0 | Preferred for body text |
| Black text on #2545A9 | 2.50:1 | Fails | Lc 15.6 | Dividers and decoration only |
| #2545A9 text on white | 8.39:1 | AAA | Lc 88.4 | Fine for body text |
| #2545A9 text on black | 2.50:1 | Fails | Lc -13.8 | 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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FE
oklch(88.5% 0.054 266.8)
-
Step 300
300
#A4C0FF
oklch(81% 0.095 265.8)
-
Step 400
400
#749CFF
oklch(70.8% 0.152 266)
-
Step 500
500
#517FFF
oklch(63.2% 0.197 266)
-
Step 600
600
#3864EE
oklch(55.7% 0.213 266)
-
Step 700
700
#2B51CF
oklch(49% 0.199 266.1)
-
Step 800
800 (this color)
#2545A9
oklch(43.1% 0.165 266)
-
Step 900
900
#213B85
oklch(37.8% 0.128 265.8)
-
Step 950
950
#13234E
oklch(27% 0.082 265.8)
#2545A9 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) | #0054AC | 0.039 |
| Deuteranopia (no green cones) | #0048A7 | 0.021 |
| Tritanopia (no blue cones) | #005E70 | 0.129 |
| Achromatopsia (no color) | #4D4D4D | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2545A9
#2545A9
oklch(43.1% 0.165 266)
- #664C00
#664C00
oklch(43.2% 0.089 85.9)
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 #2545A9, closest first.
No curated palette has a color within ΔE 0.04 of #2545A9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.032
- Cobalt #1E488F ΔE 0.044
- Blue Blue #2242C7 ΔE 0.048
- Blueberry #464196 ΔE 0.051
- Dusk Blue #26538D ΔE 0.063
- Majorelle Blue #3F37C9 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.066
- Light Navy #155084 ΔE 0.071
Use #2545A9 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.