#31689B
Closest named color: Denim (#3B638C). oklch(50.4% 0.1 248.9), rgb(49, 104, 155).
Aa
White text reads best on this color (5.85:1).
About this color
#31689B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.100 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.025 away. White text reads best on it, at 5.85:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.58:1 |
| White text | 5.85:1 |
Values
| HEX | #31689B |
| RGB | rgb(49, 104, 155) |
| HSL | hsl(209, 52%, 40%) |
| OKLCH | oklch(50.4% 0.1 248.9) |
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 #31689B | 5.85:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #31689B | 3.58:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #31689B text on white | 5.85:1 | AA | Lc 79.1 | Fine for body text |
| #31689B text on black | 3.58:1 | AA large text | Lc -22.7 | 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 700.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CCDBEB
oklch(88.5% 0.027 249.9)
-
Step 300
300
#A9C4DF
oklch(80.9% 0.048 248.4)
-
Step 400
400
#7AA5CF
oklch(70.7% 0.077 248.4)
-
Step 500
500
#578EC3
oklch(63.1% 0.099 248.8)
-
Step 600
600
#3B77AF
oklch(55.5% 0.108 248.9)
-
Step 700
700 (this color)
#31689B
oklch(50.4% 0.1 248.9)
-
Step 800
800
#26527A
oklch(42.7% 0.083 248.4)
-
Step 900
900
#244462
oklch(37.7% 0.064 248.4)
-
Step 950
950
#16283A
oklch(27.1% 0.041 249.6)
#31689B 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) | #516A9D | 0.036 |
| Deuteranopia (no green cones) | #43609A | 0.027 |
| Tritanopia (no blue cones) | #00747A | 0.077 |
| Achromatopsia (no color) | #656565 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31689B
#31689B
oklch(50.4% 0.1 248.9)
- #895816
#895816
oklch(50.3% 0.1 68.6)
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 #31689B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.025
- Peacock Blue #016795 ΔE 0.027
- Muted Blue #3B719F ΔE 0.029
- Ocean Blue #03719C ΔE 0.031
- Dusky Blue #475F94 ΔE 0.031
- French Blue #436BAD ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.037
- Mid Blue #276AB3 ΔE 0.038
Use #31689B 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.