#517A8E
Closest named color: Metallic Blue (#4F738E). oklch(55.7% 0.055 230.1), rgb(81, 122, 142).
Aa
White text reads best on this color (4.64:1).
About this color
#517A8E is a medium-dark, muted blue. In OKLCH its lightness is 56%, its chroma 0.055 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.022 away. White text reads best on it, at 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.52:1 |
| White text | 4.64:1 |
Values
| HEX | #517A8E |
| RGB | rgb(81, 122, 142) |
| HSL | hsl(200, 27%, 44%) |
| OKLCH | oklch(55.7% 0.055 230.1) |
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 #517A8E | 4.64:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #517A8E | 4.52:1 | AA | Lc 31.9 | Non-text elements, placeholder text |
| #517A8E text on white | 4.64:1 | AA | Lc 72.2 | Content text, not long reading |
| #517A8E text on black | 4.52:1 | AA | Lc -29.5 | Dividers and decoration only |
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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D0DBE1
oklch(88.5% 0.015 231.2)
-
Step 300
300
#B1C4CE
oklch(80.9% 0.025 230.5)
-
Step 400
400
#88A6B5
oklch(70.8% 0.04 229.6)
-
Step 500
500
#6A90A3
oklch(63.2% 0.051 230.2)
-
Step 600
600 (this color)
#517A8E
oklch(55.7% 0.055 230.1)
-
Step 700
700
#416678
oklch(49% 0.051 230.2)
-
Step 800
800
#365462
oklch(42.8% 0.042 229)
-
Step 900
900
#2F4550
oklch(37.7% 0.033 230.4)
-
Step 950
950
#1C282F
oklch(26.9% 0.021 234.2)
#517A8E 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) | #70788F | 0.040 |
| Deuteranopia (no green cones) | #67728E | 0.034 |
| Tritanopia (no blue cones) | #388080 | 0.041 |
| Achromatopsia (no color) | #747474 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517A8E
#517A8E
oklch(55.7% 0.055 230.1)
- #8F6A57
#8F6A57
oklch(55.7% 0.056 48.3)
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 #517A8E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.022
- Stormy Blue #507B9C ΔE 0.022
- Cerulean #457B9D ΔE 0.025
- Grey Blue #647D8E ΔE 0.026
- Dull Blue #49759C ΔE 0.031
- Battleship Grey #6B7C85 ΔE 0.036
- Battleship Gray #6C757D ΔE 0.039
- Slate Gray #708090 ΔE 0.045
Use #517A8E 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.