#3173A1
Closest named color: Muted Blue (#3B719F). oklch(53.4% 0.098 242.3), rgb(49, 115, 161).
Aa
White text reads best on this color (5.12:1).
About this color
#3173A1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.098 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.009 away. White text reads best on it, at 5.12:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 4.09:1 |
| White text | 5.12:1 |
Values
| HEX | #3173A1 |
| RGB | rgb(49, 115, 161) |
| HSL | hsl(205, 53%, 41%) |
| OKLCH | oklch(53.4% 0.098 242.3) |
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 #3173A1 | 5.12:1 | AA | Lc -80.5 | Fine for body text |
| Black text on #3173A1 | 4.09:1 | AA large text | Lc 29.0 | Dividers and decoration only |
| #3173A1 text on white | 5.12:1 | AA | Lc 75.1 | Fine for body text |
| #3173A1 text on black | 4.09:1 | AA large text | Lc -26.6 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CCDCE8
oklch(88.6% 0.024 240.1)
-
Step 300
300
#A8C5DB
oklch(80.9% 0.044 240.9)
-
Step 400
400
#79A6C9
oklch(70.6% 0.071 242.4)
-
Step 500
500
#5590BC
oklch(63.1% 0.091 242.3)
-
Step 600
600 (this color)
#3173A1
oklch(53.4% 0.098 242.3)
-
Step 700
700
#2A6690
oklch(49.1% 0.091 242.5)
-
Step 800
800
#245375
oklch(42.6% 0.076 242.9)
-
Step 900
900
#23455E
oklch(37.7% 0.059 242.4)
-
Step 950
950
#152937
oklch(27.1% 0.037 240.5)
#3173A1 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) | #5E74A3 | 0.048 |
| Deuteranopia (no green cones) | #4F69A0 | 0.038 |
| Tritanopia (no blue cones) | #007E83 | 0.069 |
| Achromatopsia (no color) | #6E6E6E | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3173A1
#3173A1
oklch(53.4% 0.098 242.3)
- #955F29
#955F29
oklch(53.4% 0.098 62.7)
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 #3173A1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.009
- Flat Blue #3C73A8 ΔE 0.015
- Ocean Blue #03719C ΔE 0.024
- Dull Blue #49759C ΔE 0.025
- Nice Blue #107AB0 ΔE 0.029
- Sea Blue #047495 ΔE 0.030
- Cerulean #457B9D ΔE 0.033
- French Blue #436BAD ΔE 0.036
Use #3173A1 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.