#3F87AD
Closest named color: Steel Blue (#4682B4). oklch(59.4% 0.092 234.4), rgb(63, 135, 173).
Aa
Black text reads best on this color (5.28:1).
About this color
#3F87AD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.092 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.021 away. Black text reads best on it, at 5.28:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 5.28:1 |
| White text | 3.97:1 |
Values
| HEX | #3F87AD |
| RGB | rgb(63, 135, 173) |
| HSL | hsl(201, 47%, 46%) |
| OKLCH | oklch(59.4% 0.092 234.4) |
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 #3F87AD | 3.97:1 | AA large text | Lc -72.4 | Content text, not long reading |
| Black text on #3F87AD | 5.28:1 | AA | Lc 37.2 | Non-text elements, placeholder text |
| #3F87AD text on white | 3.97:1 | AA large text | Lc 66.9 | Content text, not long reading |
| #3F87AD text on black | 5.28:1 | AA | Lc -34.8 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CADCE7
oklch(88.4% 0.025 234.5)
-
Step 300
300
#A5C6DA
oklch(80.9% 0.045 234.7)
-
Step 400
400
#73A8C7
oklch(70.6% 0.072 234.9)
-
Step 500
500 (this color)
#3F87AD
oklch(59.4% 0.092 234.4)
-
Step 600
600
#297CA5
oklch(55.6% 0.1 234.5)
-
Step 700
700
#1A698D
oklch(49.2% 0.092 233.6)
-
Step 800
800
#195573
oklch(42.6% 0.078 234.9)
-
Step 900
900
#1C475D
oklch(37.8% 0.06 233.9)
-
Step 950
950
#122936
oklch(26.9% 0.038 235.3)
#3F87AD 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) | #7586AF | 0.059 |
| Deuteranopia (no green cones) | #667BAC | 0.049 |
| Tritanopia (no blue cones) | #009194 | 0.062 |
| Achromatopsia (no color) | #7F7F7F | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F87AD
#3F87AD
oklch(59.4% 0.092 234.4)
- #A96F47
#A96F47
oklch(59.4% 0.092 54.6)
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 #3F87AD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.021
- Off Blue #5684AE ΔE 0.022
- Blue NCS #118AB2 ΔE 0.023
- Cool Blue #4984B8 ΔE 0.023
- Dusty Blue #5A86AD ΔE 0.025
- Cerulean #457B9D ΔE 0.037
- Teal Blue #01889F ΔE 0.038
- Stormy Blue #507B9C ΔE 0.038
Use #3F87AD 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.