#2555B9
Closest named color: Blue Blue (#2242C7). oklch(47.7% 0.167 262.6), rgb(37, 85, 185).
Aa
White text reads best on this color (6.82:1).
About this color
#2555B9 is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.167 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.050 away. White text reads best on it, at 6.82:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 3.07:1 |
| White text | 6.82:1 |
Values
| HEX | #2555B9 |
| RGB | rgb(37, 85, 185) |
| HSL | hsl(221, 67%, 44%) |
| OKLCH | oklch(47.7% 0.167 262.6) |
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 #2555B9 | 6.82:1 | AA | Lc -88.0 | Fine for body text |
| Black text on #2555B9 | 3.07:1 | AA large text | Lc 21.0 | Dividers and decoration only |
| #2555B9 text on white | 6.82:1 | AA | Lc 83.0 | Fine for body text |
| #2555B9 text on black | 3.07:1 | AA large text | Lc -18.9 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF8
oklch(88.6% 0.045 263.1)
-
Step 300
300
#A5C1F6
oklch(80.9% 0.081 263)
-
Step 400
400
#759FF1
oklch(70.7% 0.129 262.9)
-
Step 500
500
#5185EC
oklch(63.1% 0.165 262.5)
-
Step 600
600
#366CDA
oklch(55.6% 0.178 262.5)
-
Step 700
700 (this color)
#2555B9
oklch(47.7% 0.167 262.6)
-
Step 800
800
#234999
oklch(42.6% 0.138 262.8)
-
Step 900
900
#213E7A
oklch(37.6% 0.108 262.9)
-
Step 950
950
#142547
oklch(27% 0.067 262.7)
#2555B9 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) | #0062BD | 0.034 |
| Deuteranopia (no green cones) | #0054B7 | 0.018 |
| Tritanopia (no blue cones) | #006E7E | 0.131 |
| Achromatopsia (no color) | #5B5B5B | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2555B9
#2555B9
oklch(47.7% 0.167 262.6)
- #785600
#785600
oklch(47.7% 0.098 81.9)
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 #2555B9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.050
- Mid Blue #276AB3 ΔE 0.059
- Warm Blue #4B57DB ΔE 0.068
- Denim Blue #3B5B92 ΔE 0.070
- Majorelle Blue #3F37C9 ΔE 0.070
- Dusk Blue #26538D ΔE 0.071
- Sapphire #2138AB ΔE 0.074
- Blue With A Hint Of Purple #533CC6 ΔE 0.075
Use #2555B9 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.