#3187BF
Closest named color: Cool Blue (#4984B8). oklch(59.8% 0.118 241.5), rgb(49, 135, 191).
Aa
Black text reads best on this color (5.34:1).
About this color
#3187BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.118 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.020 away. Black text reads best on it, at 5.34:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.34:1 |
| White text | 3.92:1 |
Values
| HEX | #3187BF |
| RGB | rgb(49, 135, 191) |
| HSL | hsl(204, 59%, 47%) |
| OKLCH | oklch(59.8% 0.118 241.5) |
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 #3187BF | 3.92:1 | AA large text | Lc -71.8 | Content text, not long reading |
| Black text on #3187BF | 5.34:1 | AA | Lc 37.8 | Non-text elements, placeholder text |
| #3187BF text on white | 3.92:1 | AA large text | Lc 66.3 | Content text, not long reading |
| #3187BF text on black | 5.34:1 | AA | Lc -35.3 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF4
oklch(93.7% 0.016 239.1)
-
Step 200
200
#C7DCED
oklch(88.4% 0.033 242.4)
-
Step 300
300
#A0C6E3
oklch(80.9% 0.058 241.3)
-
Step 400
400
#6AA8D5
oklch(70.7% 0.092 241.3)
-
Step 500
500 (this color)
#3187BF
oklch(59.8% 0.118 241.5)
-
Step 600
600
#0B7AB7
oklch(55.5% 0.129 241.9)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#045480
oklch(42.7% 0.099 241.8)
-
Step 900
900
#134666
oklch(37.7% 0.076 241)
-
Step 950
950
#0D293C
oklch(27% 0.049 241.5)
#3187BF 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) | #6D88C1 | 0.058 |
| Deuteranopia (no green cones) | #597ABE | 0.046 |
| Tritanopia (no blue cones) | #00959B | 0.080 |
| Achromatopsia (no color) | #808080 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3187BF
#3187BF
oklch(59.8% 0.118 241.5)
- #B16D2A
#B16D2A
oklch(59.7% 0.118 61.3)
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 #3187BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.020
- Steel Blue #4682B4 ΔE 0.022
- Water Blue #0E87CC ΔE 0.023
- Blue NCS #118AB2 ΔE 0.028
- Off Blue #5684AE ΔE 0.037
- Dusty Blue #5A86AD ΔE 0.042
- Windows Blue #3778BF ΔE 0.042
- Nice Blue #107AB0 ΔE 0.046
Use #3187BF 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.