#517FA3
Closest named color: Stormy Blue (#507B9C). oklch(57.8% 0.075 243.2), rgb(81, 127, 163).
Aa
Black text reads best on this color (4.91:1).
About this color
#517FA3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.075 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.014 away. Black text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.91:1 |
| White text | 4.27:1 |
Values
| HEX | #517FA3 |
| RGB | rgb(81, 127, 163) |
| HSL | hsl(206, 34%, 48%) |
| OKLCH | oklch(57.8% 0.075 243.2) |
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 #517FA3 | 4.27:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #517FA3 | 4.91:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #517FA3 text on white | 4.27:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #517FA3 text on black | 4.91:1 | AA | Lc -32.2 | 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
#AFC4D5
oklch(81% 0.033 242.4)
-
Step 400
400
#84A5C0
oklch(70.7% 0.054 243.3)
-
Step 500
500
#648FB0
oklch(63.1% 0.069 242.2)
-
Step 600
600 (this color)
#517FA3
oklch(57.8% 0.075 243.2)
-
Step 700
700
#3C6585
oklch(49.1% 0.069 243.4)
-
Step 800
800
#32536C
oklch(42.8% 0.057 242.4)
-
Step 900
900
#2C4458
oklch(37.6% 0.046 244.6)
-
Step 950
950
#1A2833
oklch(26.9% 0.028 242.7)
#517FA3 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) | #707FA5 | 0.038 |
| Deuteranopia (no green cones) | #6577A2 | 0.031 |
| Tritanopia (no blue cones) | #28888B | 0.063 |
| Achromatopsia (no color) | #7A7A7A | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517FA3
#517FA3
oklch(57.8% 0.075 243.2)
- #9A704A
#9A704A
oklch(57.9% 0.075 62.6)
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 #517FA3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.014
- Cerulean #457B9D ΔE 0.020
- Off Blue #5684AE ΔE 0.021
- Dusty Blue #5A86AD ΔE 0.026
- Steel Blue #4682B4 ΔE 0.026
- Dull Blue #49759C ΔE 0.032
- Cool Blue #4984B8 ΔE 0.032
- Grey Blue #647D8E ΔE 0.036
Use #517FA3 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.