#3F84AF
Closest named color: Steel Blue (#4682B4). oklch(58.7% 0.096 238.7), rgb(63, 132, 175).
Aa
Black text reads best on this color (5.13:1).
About this color
#3F84AF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.096 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.012 away. Black text reads best on it, at 5.13:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 5.13:1 |
| White text | 4.09:1 |
Values
| HEX | #3F84AF |
| RGB | rgb(63, 132, 175) |
| HSL | hsl(203, 47%, 47%) |
| OKLCH | oklch(58.7% 0.096 238.7) |
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 #3F84AF | 4.09:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #3F84AF | 5.13:1 | AA | Lc 36.2 | Non-text elements, placeholder text |
| #3F84AF text on white | 4.09:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #3F84AF text on black | 5.13:1 | AA | Lc -33.8 | 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 600.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A8C5DA
oklch(80.9% 0.043 239.6)
-
Step 400
400
#78A7C7
oklch(70.7% 0.069 238.8)
-
Step 500
500
#5391B9
oklch(63.1% 0.088 238.6)
-
Step 600
600 (this color)
#3F84AF
oklch(58.7% 0.096 238.7)
-
Step 700
700
#27678D
oklch(49.1% 0.089 238.5)
-
Step 800
800
#225473
oklch(42.7% 0.074 239.1)
-
Step 900
900
#21465D
oklch(37.8% 0.058 238.2)
-
Step 950
950
#142936
oklch(27% 0.036 237.4)
#3F84AF 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) | #7084B1 | 0.053 |
| Deuteranopia (no green cones) | #6178AE | 0.045 |
| Tritanopia (no blue cones) | #008F93 | 0.068 |
| Achromatopsia (no color) | #7D7D7D | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F84AF
#3F84AF
oklch(58.7% 0.096 238.7)
- #A76E3F
#A76E3F
oklch(58.9% 0.096 58.9)
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 #3F84AF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.012
- Cool Blue #4984B8 ΔE 0.018
- Off Blue #5684AE ΔE 0.022
- Blue NCS #118AB2 ΔE 0.026
- Dusty Blue #5A86AD ΔE 0.028
- Cerulean #457B9D ΔE 0.033
- Stormy Blue #507B9C ΔE 0.035
- Teal Blue #01889F ΔE 0.042
Use #3F84AF 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.