#5178B2
Closest named color: Steel Blue (#4682B4). oklch(57% 0.1 258.1), rgb(81, 120, 178).
Aa
Black text reads best on this color (4.67:1).
About this color
#5178B2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.100 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.028 away. Black text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.67:1 |
| White text | 4.48:1 |
Values
| HEX | #5178B2 |
| RGB | rgb(81, 120, 178) |
| HSL | hsl(216, 39%, 51%) |
| OKLCH | oklch(57% 0.1 258.1) |
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 #5178B2 | 4.48:1 | AA large text | Lc -76.5 | Fine for body text |
| Black text on #5178B2 | 4.67:1 | AA | Lc 33.1 | Non-text elements, placeholder text |
| #5178B2 text on white | 4.48:1 | AA large text | Lc 71.0 | Content text, not long reading |
| #5178B2 text on black | 4.67:1 | AA | Lc -30.6 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#CFDAEA
oklch(88.5% 0.025 257.6)
-
Step 300
300
#AFC2DE
oklch(80.9% 0.045 258)
-
Step 400
400
#85A2CE
oklch(70.7% 0.072 258.6)
-
Step 500
500
#668BC1
oklch(63.1% 0.092 257.7)
-
Step 600
600 (this color)
#5178B2
oklch(57% 0.1 258.1)
-
Step 700
700
#3E6195
oklch(49.1% 0.093 258.1)
-
Step 800
800
#334F79
oklch(42.6% 0.078 258.3)
-
Step 900
900
#2D4261
oklch(37.6% 0.06 258)
-
Step 950
950
#1B2739
oklch(27.1% 0.038 258.3)
#5178B2 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) | #617CB4 | 0.024 |
| Deuteranopia (no green cones) | #5573B1 | 0.014 |
| Tritanopia (no blue cones) | #18858D | 0.089 |
| Achromatopsia (no color) | #777777 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5178B2
#5178B2
oklch(57% 0.1 258.1)
- #976F28
#976F28
oklch(56.9% 0.1 78.3)
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 #5178B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.028
- Windows Blue #3778BF ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.031
- Cool Blue #4984B8 ΔE 0.033
- Dull Blue #49759C ΔE 0.036
- Off Blue #5684AE ΔE 0.038
- Stormy Blue #507B9C ΔE 0.038
- Cerulean #457B9D ΔE 0.039
Use #5178B2 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.