#517FA5
Closest named color: Stormy Blue (#507B9C). oklch(57.9% 0.077 244.6), rgb(81, 127, 165).
Aa
Black text reads best on this color (4.92:1).
About this color
#517FA5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.077 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.016 away. Black text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.92:1 |
| White text | 4.26:1 |
Values
| HEX | #517FA5 |
| RGB | rgb(81, 127, 165) |
| HSL | hsl(207, 34%, 48%) |
| OKLCH | oklch(57.9% 0.077 244.6) |
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 #517FA5 | 4.26:1 | AA large text | Lc -74.8 | Content text, not long reading |
| Black text on #517FA5 | 4.92:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #517FA5 text on white | 4.26:1 | AA large text | Lc 69.3 | Content text, not long reading |
| #517FA5 text on black | 4.92:1 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CFDBE5
oklch(88.5% 0.019 243)
-
Step 300
300
#AEC4D6
oklch(80.9% 0.035 242.8)
-
Step 400
400
#84A5C2
oklch(70.8% 0.056 245.2)
-
Step 500
500
#648EB2
oklch(63% 0.072 245.1)
-
Step 600
600 (this color)
#517FA5
oklch(57.9% 0.077 244.6)
-
Step 700
700
#3B6587
oklch(49.1% 0.072 244.5)
-
Step 800
800
#31526E
oklch(42.6% 0.061 245.5)
-
Step 900
900
#2C4459
oklch(37.6% 0.047 245.9)
-
Step 950
950
#1A2834
oklch(27% 0.03 245.1)
#517FA5 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) | #6F7FA7 | 0.037 |
| Deuteranopia (no green cones) | #6477A4 | 0.030 |
| Tritanopia (no blue cones) | #26888C | 0.064 |
| Achromatopsia (no color) | #7B7B7B | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517FA5
#517FA5
oklch(57.9% 0.077 244.6)
- #9A7047
#9A7047
oklch(57.8% 0.078 64.6)
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 #517FA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.016
- Off Blue #5684AE ΔE 0.019
- Cerulean #457B9D ΔE 0.021
- Steel Blue #4682B4 ΔE 0.024
- Dusty Blue #5A86AD ΔE 0.025
- Cool Blue #4984B8 ΔE 0.029
- Dull Blue #49759C ΔE 0.032
- Grey Blue #647D8E ΔE 0.039
Use #517FA5 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.