#51699E
Closest named color: French Blue (#436BAD). oklch(52.5% 0.089 264.9), rgb(81, 105, 158).
Aa
White text reads best on this color (5.43:1).
About this color
#51699E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.089 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.027 away. White text reads best on it, at 5.43:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.86:1 |
| White text | 5.43:1 |
Values
| HEX | #51699E |
| RGB | rgb(81, 105, 158) |
| HSL | hsl(221, 32%, 47%) |
| OKLCH | oklch(52.5% 0.089 264.9) |
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 #51699E | 5.43:1 | AA | Lc -82.3 | Fine for body text |
| Black text on #51699E | 3.86:1 | AA large text | Lc 27.1 | Dividers and decoration only |
| #51699E text on white | 5.43:1 | AA | Lc 77.0 | Fine for body text |
| #51699E text on black | 3.86:1 | AA large text | Lc -24.7 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E8
oklch(88.4% 0.022 265.8)
-
Step 300
300
#B4C1DB
oklch(80.9% 0.039 264.3)
-
Step 400
400
#8DA0C9
oklch(70.6% 0.064 265.4)
-
Step 500
500
#7189BC
oklch(63.2% 0.082 264.7)
-
Step 600
600 (this color)
#51699E
oklch(52.5% 0.089 264.9)
-
Step 700
700
#495F90
oklch(49% 0.084 265.1)
-
Step 800
800
#3C4E75
oklch(42.7% 0.069 264.7)
-
Step 900
900
#34415E
oklch(37.7% 0.053 265.4)
-
Step 950
950
#1E2637
oklch(26.9% 0.034 264.8)
#51699E 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) | #556DA0 | 0.013 |
| Deuteranopia (no green cones) | #4D679D | 0.008 |
| Tritanopia (no blue cones) | #32747C | 0.079 |
| Achromatopsia (no color) | #6A6A6A | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51699E
#51699E
oklch(52.5% 0.089 264.9)
- #826626
#826626
oklch(52.6% 0.089 84.9)
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 #51699E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.027
- Muted Blue #3B719F ΔE 0.030
- Flat Blue #3C73A8 ΔE 0.033
- Dusky Blue #475F94 ΔE 0.034
- Dull Blue #49759C ΔE 0.036
- Denim #3B638C ΔE 0.043
- Metallic Blue #4F738E ΔE 0.044
- Mid Blue #276AB3 ΔE 0.050
Use #51699E 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.