#517FA0
Closest named color: Stormy Blue (#507B9C). oklch(57.7% 0.072 240.8), rgb(81, 127, 160).
Aa
Black text reads best on this color (4.89:1).
About this color
#517FA0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.072 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.012 away. Black text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.89:1 |
| White text | 4.29:1 |
Values
| HEX | #517FA0 |
| RGB | rgb(81, 127, 160) |
| HSL | hsl(205, 33%, 47%) |
| OKLCH | oklch(57.7% 0.072 240.8) |
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 #517FA0 | 4.29:1 | AA large text | Lc -75.1 | Fine for body text |
| Black text on #517FA0 | 4.89:1 | AA | Lc 34.5 | Non-text elements, placeholder text |
| #517FA0 text on white | 4.29:1 | AA large text | Lc 69.6 | Content text, not long reading |
| #517FA0 text on black | 4.89:1 | AA | Lc -32.1 | 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
#E5EBF0
oklch(93.7% 0.009 242.8)
-
Step 200
200
#CFDBE4
oklch(88.5% 0.018 240)
-
Step 300
300
#AFC4D4
oklch(81% 0.032 240.7)
-
Step 400
400
#84A5BE
oklch(70.6% 0.052 241.1)
-
Step 500
500
#658FAE
oklch(63.1% 0.066 241.1)
-
Step 600
600 (this color)
#517FA0
oklch(57.7% 0.072 240.8)
-
Step 700
700
#3C6683
oklch(49.2% 0.066 240.1)
-
Step 800
800
#32536B
oklch(42.7% 0.056 241.3)
-
Step 900
900
#2C4556
oklch(37.8% 0.042 239.1)
-
Step 950
950
#1A2833
oklch(26.9% 0.028 242.7)
#517FA0 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) | #717FA2 | 0.040 |
| Deuteranopia (no green cones) | #66769F | 0.034 |
| Tritanopia (no blue cones) | #2B878A | 0.058 |
| Achromatopsia (no color) | #7A7A7A | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517FA0
#517FA0
oklch(57.7% 0.072 240.8)
- #996F4D
#996F4D
oklch(57.6% 0.072 59.7)
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 #517FA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.012
- Cerulean #457B9D ΔE 0.019
- Off Blue #5684AE ΔE 0.025
- Dusty Blue #5A86AD ΔE 0.028
- Steel Blue #4682B4 ΔE 0.031
- Dull Blue #49759C ΔE 0.031
- Grey Blue #647D8E ΔE 0.033
- Cool Blue #4984B8 ΔE 0.036
Use #517FA0 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.