#2555B0
Closest named color: Dusk Blue (#26538D). oklch(47% 0.155 261.6), rgb(37, 85, 176).
Aa
White text reads best on this color (6.98:1).
About this color
#2555B0 is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.155 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.057 away. White text reads best on it, at 6.98:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 3.00:1 |
| White text | 6.98:1 |
Values
| HEX | #2555B0 |
| RGB | rgb(37, 85, 176) |
| HSL | hsl(219, 65%, 42%) |
| OKLCH | oklch(47% 0.155 261.6) |
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 #2555B0 | 6.98:1 | AA | Lc -88.7 | Fine for body text |
| Black text on #2555B0 | 3.00:1 | AA large text | Lc 20.3 | Dividers and decoration only |
| #2555B0 text on white | 6.98:1 | AA | Lc 83.7 | Fine for body text |
| #2555B0 text on black | 3.00:1 | AA large text | Lc -18.2 | 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 700.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A6C1F2
oklch(80.8% 0.076 262.2)
-
Step 400
400
#76A0EB
oklch(70.6% 0.12 261.5)
-
Step 500
500
#5386E5
oklch(63% 0.154 261.7)
-
Step 600
600
#386ED3
oklch(55.6% 0.166 261.5)
-
Step 700
700 (this color)
#2555B0
oklch(47% 0.155 261.6)
-
Step 800
800
#244B94
oklch(42.7% 0.128 261.5)
-
Step 900
900
#223F76
oklch(37.6% 0.1 261.9)
-
Step 950
950
#142545
oklch(26.9% 0.064 261.9)
#2555B0 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) | #1960B3 | 0.029 |
| Deuteranopia (no green cones) | #0053AE | 0.020 |
| Tritanopia (no blue cones) | #006B7A | 0.120 |
| Achromatopsia (no color) | #595959 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2555B0
#2555B0
oklch(47% 0.155 261.6)
- #765400
#765400
oklch(47% 0.097 81.4)
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 #2555B0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.058
- Mid Blue #276AB3 ΔE 0.058
- Blue Blue #2242C7 ΔE 0.059
- Cobalt #1E488F ΔE 0.063
- Dusky Blue #475F94 ΔE 0.068
- Blueberry #464196 ΔE 0.068
- Light Navy Blue #2E5A88 ΔE 0.069
Use #2555B0 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.