#51699B
Closest named color: Muted Blue (#3B719F). oklch(52.4% 0.084 264.1), rgb(81, 105, 155).
Aa
White text reads best on this color (5.46:1).
About this color
#51699B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.084 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.030 away. White text reads best on it, at 5.46:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 3.84:1 |
| White text | 5.46:1 |
Values
| HEX | #51699B |
| RGB | rgb(81, 105, 155) |
| HSL | hsl(221, 31%, 46%) |
| OKLCH | oklch(52.4% 0.084 264.1) |
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 #51699B | 5.46:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #51699B | 3.84:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #51699B text on white | 5.46:1 | AA | Lc 77.2 | Fine for body text |
| #51699B text on black | 3.84:1 | AA large text | Lc -24.6 | 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
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D2D9E8
oklch(88.4% 0.022 265.8)
-
Step 300
300
#B4C1DA
oklch(80.9% 0.038 263.6)
-
Step 400
400
#8DA1C7
oklch(70.7% 0.06 263.1)
-
Step 500
500
#7289B9
oklch(63.1% 0.077 264.5)
-
Step 600
600 (this color)
#51699B
oklch(52.4% 0.084 264.1)
-
Step 700
700
#4A608E
oklch(49.2% 0.079 264.2)
-
Step 800
800
#3D4E73
oklch(42.6% 0.066 264.9)
-
Step 900
900
#34415D
oklch(37.7% 0.051 264.9)
-
Step 950
950
#1E2636
oklch(26.9% 0.032 263.8)
#51699B 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) | #566D9D | 0.014 |
| Deuteranopia (no green cones) | #4E669A | 0.010 |
| Tritanopia (no blue cones) | #34747B | 0.076 |
| Achromatopsia (no color) | #696969 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51699B
#51699B
oklch(52.4% 0.084 264.1)
- #81662A
#81662A
oklch(52.5% 0.085 84.6)
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 #51699B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.030
- French Blue #436BAD ΔE 0.031
- Dusky Blue #475F94 ΔE 0.033
- Dull Blue #49759C ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.035
- Denim #3B638C ΔE 0.040
- Metallic Blue #4F738E ΔE 0.041
- Cerulean #457B9D ΔE 0.052
Use #51699B 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.