#51698E
Closest named color: Metallic Blue (#4F738E). oklch(51.7% 0.066 258.9), rgb(81, 105, 142).
Aa
White text reads best on this color (5.58:1).
About this color
#51698E is a medium-dark, muted blue. In OKLCH its lightness is 52%, its chroma 0.066 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.030 away. White text reads best on it, at 5.58:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.76:1 |
| White text | 5.58:1 |
Values
| HEX | #51698E |
| RGB | rgb(81, 105, 142) |
| HSL | hsl(216, 27%, 44%) |
| OKLCH | oklch(51.7% 0.066 258.9) |
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 #51698E | 5.58:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #51698E | 3.76:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #51698E text on white | 5.58:1 | AA | Lc 77.9 | Fine for body text |
| #51698E text on black | 3.76:1 | AA large text | Lc -23.9 | 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 700.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D2DAE5
oklch(88.6% 0.017 256.3)
-
Step 300
300
#B5C2D6
oklch(81% 0.032 258.9)
-
Step 400
400
#8EA2C1
oklch(70.8% 0.051 259.1)
-
Step 500
500
#728BB1
oklch(63.2% 0.064 258.6)
-
Step 600
600
#5A749D
oklch(55.5% 0.071 259.3)
-
Step 700
700 (this color)
#51698E
oklch(51.7% 0.066 258.9)
-
Step 800
800
#3D506D
oklch(42.8% 0.054 258.7)
-
Step 900
900
#344258
oklch(37.6% 0.042 259.3)
-
Step 950
950
#1E2734
oklch(27% 0.028 257.5)
#51698E 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) | #5B6B90 | 0.015 |
| Deuteranopia (no green cones) | #55658D | 0.012 |
| Tritanopia (no blue cones) | #3B7176 | 0.058 |
| Achromatopsia (no color) | #686868 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51698E
#51698E
oklch(51.7% 0.066 258.9)
- #7D643B
#7D643B
oklch(51.8% 0.066 78.9)
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 #51698E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.030
- Denim #3B638C ΔE 0.034
- Muted Blue #3B719F ΔE 0.035
- Dull Blue #49759C ΔE 0.036
- Dusky Blue #475F94 ΔE 0.037
- Slate #516572 ΔE 0.044
- Flat Blue #3C73A8 ΔE 0.046
- French Blue #436BAD ΔE 0.050
Use #51698E 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.