#31709D
Closest named color: Muted Blue (#3B719F). oklch(52.5% 0.096 242.8), rgb(49, 112, 157).
Aa
White text reads best on this color (5.33:1).
About this color
#31709D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.096 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.010 away. White text reads best on it, at 5.33:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 3.93:1 |
| White text | 5.33:1 |
Values
| HEX | #31709D |
| RGB | rgb(49, 112, 157) |
| HSL | hsl(205, 52%, 40%) |
| OKLCH | oklch(52.5% 0.096 242.8) |
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 #31709D | 5.33:1 | AA | Lc -81.7 | Fine for body text |
| Black text on #31709D | 3.93:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #31709D text on white | 5.33:1 | AA | Lc 76.3 | Fine for body text |
| #31709D text on black | 3.93:1 | AA large text | Lc -25.4 | 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
#CCDBE8
oklch(88.4% 0.024 244.2)
-
Step 300
300
#A9C5DB
oklch(81% 0.043 241.8)
-
Step 400
400
#7BA6C9
oklch(70.7% 0.069 243.5)
-
Step 500
500
#5790BB
oklch(63.2% 0.089 242.5)
-
Step 600
600 (this color)
#31709D
oklch(52.5% 0.096 242.8)
-
Step 700
700
#2C668F
oklch(49.1% 0.089 242.5)
-
Step 800
800
#265374
oklch(42.6% 0.074 243)
-
Step 900
900
#24455E
oklch(37.7% 0.058 243)
-
Step 950
950
#162937
oklch(27.2% 0.036 241.7)
#31709D 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) | #5C719F | 0.047 |
| Deuteranopia (no green cones) | #4D669C | 0.037 |
| Tritanopia (no blue cones) | #007B80 | 0.069 |
| Achromatopsia (no color) | #6B6B6B | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31709D
#31709D
oklch(52.5% 0.096 242.8)
- #915D28
#915D28
oklch(52.5% 0.096 63.3)
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 #31709D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.010
- Ocean Blue #03719C ΔE 0.021
- Flat Blue #3C73A8 ΔE 0.022
- Sea Blue #047495 ΔE 0.028
- Dull Blue #49759C ΔE 0.029
- French Blue #436BAD ΔE 0.036
- Nice Blue #107AB0 ΔE 0.037
- Metallic Blue #4F738E ΔE 0.040
Use #31709D 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.