#51658B
Closest named color: Denim (#3B638C). oklch(50.6% 0.066 262.8), rgb(81, 101, 139).
Aa
White text reads best on this color (5.85:1).
About this color
#51658B is a medium-dark, muted blue. In OKLCH its lightness is 51%, its chroma 0.066 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.028 away. White text reads best on it, at 5.85:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.58:1 |
| White text | 5.85:1 |
Values
| HEX | #51658B |
| RGB | rgb(81, 101, 139) |
| HSL | hsl(219, 26%, 43%) |
| OKLCH | oklch(50.6% 0.066 262.8) |
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 #51658B | 5.85:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #51658B | 3.58:1 | AA large text | Lc 24.8 | Dividers and decoration only |
| #51658B text on white | 5.85:1 | AA | Lc 79.3 | Fine for body text |
| #51658B text on black | 3.58:1 | AA large text | Lc -22.5 | 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 700.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D3D9E5
oklch(88.4% 0.018 264.5)
-
Step 300
300
#B6C1D6
oklch(80.9% 0.032 263.5)
-
Step 400
400
#90A1C1
oklch(70.7% 0.051 263)
-
Step 500
500
#758AB1
oklch(63.2% 0.064 262.6)
-
Step 600
600
#5D739D
oklch(55.5% 0.071 262.9)
-
Step 700
700 (this color)
#51658B
oklch(50.6% 0.066 262.8)
-
Step 800
800
#3F4F6D
oklch(42.7% 0.054 262.6)
-
Step 900
900
#364258
oklch(37.8% 0.041 262.3)
-
Step 950
950
#1F2734
oklch(27.1% 0.027 260)
#51658B 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) | #58688D | 0.014 |
| Deuteranopia (no green cones) | #52628A | 0.009 |
| Tritanopia (no blue cones) | #3D6D72 | 0.059 |
| Achromatopsia (no color) | #656565 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51658B
#51658B
oklch(50.6% 0.066 262.8)
- #776237
#776237
oklch(50.7% 0.066 84.1)
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 #51658B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.028
- Dusky Blue #475F94 ΔE 0.029
- Metallic Blue #4F738E ΔE 0.041
- Slate #516572 ΔE 0.041
- Muted Blue #3B719F ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.046
- Dusty Grape #545775 ΔE 0.047
- Dull Blue #49759C ΔE 0.047
Use #51658B 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.