#3F87AF
Closest named color: Steel Blue (#4682B4). oklch(59.4% 0.094 235.8), rgb(63, 135, 175).
Aa
Black text reads best on this color (5.29:1).
About this color
#3F87AF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.094 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.019 away. Black text reads best on it, at 5.29:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 5.29:1 |
| White text | 3.96:1 |
Values
| HEX | #3F87AF |
| RGB | rgb(63, 135, 175) |
| HSL | hsl(201, 47%, 47%) |
| OKLCH | oklch(59.4% 0.094 235.8) |
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 #3F87AF | 3.96:1 | AA large text | Lc -72.3 | Content text, not long reading |
| Black text on #3F87AF | 5.29:1 | AA | Lc 37.3 | Non-text elements, placeholder text |
| #3F87AF text on white | 3.96:1 | AA large text | Lc 66.8 | Content text, not long reading |
| #3F87AF text on black | 5.29:1 | AA | Lc -34.9 | 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
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A5C6DB
oklch(80.9% 0.046 236.1)
-
Step 400
400
#73A8C9
oklch(70.7% 0.074 236.6)
-
Step 500
500 (this color)
#3F87AF
oklch(59.4% 0.094 235.8)
-
Step 600
600
#287CA7
oklch(55.6% 0.103 235.6)
-
Step 700
700
#19688F
oklch(49% 0.095 235.8)
-
Step 800
800
#195574
oklch(42.7% 0.079 235.8)
-
Step 900
900
#1C465E
oklch(37.6% 0.062 236.8)
-
Step 950
950
#122937
oklch(26.9% 0.039 237.4)
#3F87AF 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) | #7486B1 | 0.057 |
| Deuteranopia (no green cones) | #657BAE | 0.048 |
| Tritanopia (no blue cones) | #009194 | 0.065 |
| Achromatopsia (no color) | #808080 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F87AF
#3F87AF
oklch(59.4% 0.094 235.8)
- #A96F45
#A96F45
oklch(59.4% 0.093 55.7)
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 #3F87AF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.019
- Cool Blue #4984B8 ΔE 0.020
- Off Blue #5684AE ΔE 0.022
- Blue NCS #118AB2 ΔE 0.023
- Dusty Blue #5A86AD ΔE 0.025
- Cerulean #457B9D ΔE 0.038
- Stormy Blue #507B9C ΔE 0.039
- Teal Blue #01889F ΔE 0.040
Use #3F87AF 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.