#5177D0
Closest named color: Windows Blue (#3778BF). oklch(58.5% 0.143 264.9), rgb(81, 119, 208).
Aa
Black text reads best on this color (4.89:1).
About this color
#5177D0 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.143 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.038 away. Black text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.89:1 |
| White text | 4.28:1 |
Values
| HEX | #5177D0 |
| RGB | rgb(81, 119, 208) |
| HSL | hsl(222, 57%, 57%) |
| OKLCH | oklch(58.5% 0.143 264.9) |
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 #5177D0 | 4.28:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #5177D0 | 4.89:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #5177D0 text on white | 4.28:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #5177D0 text on black | 4.89:1 | AA | Lc -32.3 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#ACC1EB
oklch(80.9% 0.064 264.1)
-
Step 400
400
#819FE1
oklch(70.6% 0.103 265.1)
-
Step 500
500
#6286D9
oklch(63.1% 0.132 265.1)
-
Step 600
600 (this color)
#5177D0
oklch(58.5% 0.143 264.9)
-
Step 700
700
#3B5CAB
oklch(49.2% 0.132 264.9)
-
Step 800
800
#304B8B
oklch(42.6% 0.111 264.9)
-
Step 900
900
#2B3F6F
oklch(37.6% 0.086 265.4)
-
Step 950
950
#192541
oklch(26.9% 0.055 265.3)
#5177D0 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) | #4F80D3 | 0.024 |
| Deuteranopia (no green cones) | #3C75CE | 0.022 |
| Tritanopia (no blue cones) | #008B99 | 0.123 |
| Achromatopsia (no color) | #7A7A7A | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5177D0
#5177D0
oklch(58.5% 0.143 264.9)
- #9C7500
#9C7500
oklch(58.5% 0.12 85.2)
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 #5177D0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.038
- Royal Blue #4169E1 ΔE 0.052
- Water Blue #0E87CC ΔE 0.056
- Cool Blue #4984B8 ΔE 0.057
- Steel Blue #4682B4 ΔE 0.059
- Soft Blue #6488EA ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.063
- Dark Periwinkle #665FD1 ΔE 0.063
Use #5177D0 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.