#3F7FAC
Closest named color: Steel Blue (#4682B4). oklch(57.4% 0.096 241.7), rgb(63, 127, 172).
Aa
Black text reads best on this color (4.84:1).
About this color
#3F7FAC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.096 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.016 away. Black text reads best on it, at 4.84:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.84:1 |
| White text | 4.33:1 |
Values
| HEX | #3F7FAC |
| RGB | rgb(63, 127, 172) |
| HSL | hsl(205, 46%, 46%) |
| OKLCH | oklch(57.4% 0.096 241.7) |
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 #3F7FAC | 4.33:1 | AA large text | Lc -75.3 | Fine for body text |
| Black text on #3F7FAC | 4.84:1 | AA | Lc 34.3 | Non-text elements, placeholder text |
| #3F7FAC text on white | 4.33:1 | AA large text | Lc 69.8 | Content text, not long reading |
| #3F7FAC text on black | 4.84:1 | AA | Lc -31.8 | 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
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CCDCE8
oklch(88.6% 0.024 240.1)
-
Step 300
300
#A9C5DA
oklch(80.9% 0.042 240.5)
-
Step 400
400
#7AA6C8
oklch(70.6% 0.069 242.1)
-
Step 500
500
#5690BA
oklch(63.1% 0.088 241.5)
-
Step 600
600 (this color)
#3F7FAC
oklch(57.4% 0.096 241.7)
-
Step 700
700
#2B668F
oklch(49.1% 0.09 242.2)
-
Step 800
800
#255374
oklch(42.6% 0.075 242.5)
-
Step 900
900
#23455D
oklch(37.6% 0.057 241.3)
-
Step 950
950
#152937
oklch(27.1% 0.037 240.5)
#3F7FAC 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) | #6B7FAE | 0.049 |
| Deuteranopia (no green cones) | #5C74AB | 0.040 |
| Tritanopia (no blue cones) | #008A8E | 0.071 |
| Achromatopsia (no color) | #797979 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F7FAC
#3F7FAC
oklch(57.4% 0.096 241.7)
- #A16B39
#A16B39
oklch(57.5% 0.095 61.8)
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 #3F7FAC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.016
- Cerulean #457B9D ΔE 0.023
- Cool Blue #4984B8 ΔE 0.024
- Stormy Blue #507B9C ΔE 0.027
- Off Blue #5684AE ΔE 0.029
- Dull Blue #49759C ΔE 0.033
- Nice Blue #107AB0 ΔE 0.033
- Blue NCS #118AB2 ΔE 0.035
Use #3F7FAC 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.