#517AA3
Closest named color: Stormy Blue (#507B9C). oklch(56.7% 0.079 249.4), rgb(81, 122, 163).
Aa
Black text reads best on this color (4.66:1).
About this color
#517AA3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.079 and its hue 249°. 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 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.66:1 |
| White text | 4.50:1 |
Values
| HEX | #517AA3 |
| RGB | rgb(81, 122, 163) |
| HSL | hsl(210, 34%, 48%) |
| OKLCH | oklch(56.7% 0.079 249.4) |
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 #517AA3 | 4.50:1 | AA | Lc -76.6 | Fine for body text |
| Black text on #517AA3 | 4.66:1 | AA | Lc 32.9 | Non-text elements, placeholder text |
| #517AA3 text on white | 4.50:1 | AA | Lc 71.2 | Content text, not long reading |
| #517AA3 text on black | 4.66:1 | AA | Lc -30.5 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EBF1
oklch(93.7% 0.01 247.9)
-
Step 200
200
#D0DAE6
oklch(88.4% 0.02 252.9)
-
Step 300
300
#B0C3D7
oklch(80.9% 0.035 249.6)
-
Step 400
400
#86A4C3
oklch(70.7% 0.056 249.5)
-
Step 500
500
#678DB4
oklch(63% 0.073 249.7)
-
Step 600
600 (this color)
#517AA3
oklch(56.7% 0.079 249.4)
-
Step 700
700
#3F6489
oklch(49.2% 0.073 249.5)
-
Step 800
800
#34526F
oklch(42.8% 0.06 248.6)
-
Step 900
900
#2E445A
oklch(37.8% 0.047 249.2)
-
Step 950
950
#1B2835
oklch(27.1% 0.03 249)
#517AA3 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) | #697BA5 | 0.030 |
| Deuteranopia (no green cones) | #5F73A2 | 0.024 |
| Tritanopia (no blue cones) | #2A8388 | 0.067 |
| Achromatopsia (no color) | #777777 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517AA3
#517AA3
oklch(56.7% 0.079 249.4)
- #946E41
#946E41
oklch(56.6% 0.078 69.8)
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 #517AA3, 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 0.017
- Dull Blue #49759C ΔE 0.020
- Steel Blue #4682B4 ΔE 0.030
- Off Blue #5684AE ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.034
- Metallic Blue #4F738E ΔE 0.035
- Cool Blue #4984B8 ΔE 0.037
Use #517AA3 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.