#0551BA
Closest named color: Blue Blue (#2242C7). oklch(46.3% 0.179 259.4), rgb(5, 81, 186).
Aa
White text reads best on this color (7.26:1).
About this color
#0551BA is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.179 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.040 away. White text reads best on it, at 7.26:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.179) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.89:1 |
| White text | 7.26:1 |
Values
| HEX | #0551BA |
| RGB | rgb(5, 81, 186) |
| HSL | hsl(215, 95%, 37%) |
| OKLCH | oklch(46.3% 0.179 259.4) |
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 #0551BA | 7.26:1 | AAA | Lc -89.3 | Fine for body text |
| Black text on #0551BA | 2.89:1 | Fails | Lc 19.6 | Dividers and decoration only |
| #0551BA text on white | 7.26:1 | AAA | Lc 84.4 | Fine for body text |
| #0551BA text on black | 2.89:1 | Fails | Lc -17.6 | 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 700.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A0C2F9
oklch(80.9% 0.087 259.9)
-
Step 400
400
#6BA0F6
oklch(70.6% 0.139 259.7)
-
Step 500
500
#4286F2
oklch(63.1% 0.176 259.4)
-
Step 600
600
#206CE1
oklch(55.5% 0.193 259.5)
-
Step 700
700 (this color)
#0551BA
oklch(46.3% 0.179 259.4)
-
Step 800
800
#134A9E
oklch(42.7% 0.148 259.4)
-
Step 900
900
#173F7D
oklch(37.7% 0.115 259.2)
-
Step 950
950
#0F2549
oklch(26.9% 0.073 259.8)
#0551BA 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) | #005FBE | 0.037 |
| Deuteranopia (no green cones) | #004FB8 | 0.007 |
| Tritanopia (no blue cones) | #006C7D | 0.137 |
| Achromatopsia (no color) | #575757 | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0551BA
#0551BA
oklch(46.3% 0.179 259.4)
- #755100
#755100
oklch(46.2% 0.096 79)
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 #0551BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.040
- Sapphire #2138AB ΔE 0.062
- Majorelle Blue #3F37C9 ΔE 0.068
- Cobalt #1E488F ΔE 0.071
- Dusk Blue #26538D ΔE 0.075
- Mid Blue #276AB3 ΔE 0.075
- Warm Blue #4B57DB ΔE 0.081
- Blue With A Hint Of Purple #533CC6 ΔE 0.082
Use #0551BA 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.