#3F7CA2
Closest named color: Cerulean (#457B9D). oklch(56.2% 0.087 238.3), rgb(63, 124, 162).
Aa
Black text reads best on this color (4.61:1).
About this color
#3F7CA2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.087 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.009 away. Black text reads best on it, at 4.61:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.61:1 |
| White text | 4.54:1 |
Values
| HEX | #3F7CA2 |
| RGB | rgb(63, 124, 162) |
| HSL | hsl(203, 44%, 44%) |
| OKLCH | oklch(56.2% 0.087 238.3) |
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 #3F7CA2 | 4.54:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #3F7CA2 | 4.61:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #3F7CA2 text on white | 4.54:1 | AA | Lc 71.4 | Content text, not long reading |
| #3F7CA2 text on black | 4.61:1 | AA | Lc -30.3 | 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 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
#CDDCE6
oklch(88.6% 0.021 236.8)
-
Step 300
300
#AAC5D7
oklch(80.9% 0.039 237.2)
-
Step 400
400
#7CA7C3
oklch(70.7% 0.062 237.3)
-
Step 500
500
#5990B4
oklch(63% 0.08 238.5)
-
Step 600
600 (this color)
#3F7CA2
oklch(56.2% 0.087 238.3)
-
Step 700
700
#2F6789
oklch(49.1% 0.08 238.1)
-
Step 800
800
#28546F
oklch(42.7% 0.066 238)
-
Step 900
900
#25455A
oklch(37.6% 0.052 239)
-
Step 950
950
#162935
oklch(27.1% 0.033 237.5)
#3F7CA2 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) | #6B7CA4 | 0.050 |
| Deuteranopia (no green cones) | #5D71A1 | 0.042 |
| Tritanopia (no blue cones) | #008689 | 0.064 |
| Achromatopsia (no color) | #767676 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F7CA2
#3F7CA2
oklch(56.2% 0.087 238.3)
- #9B683F
#9B683F
oklch(56.2% 0.087 58.6)
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 #3F7CA2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.009
- Stormy Blue #507B9C ΔE 0.018
- Dull Blue #49759C ΔE 0.021
- Flat Blue #3C73A8 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.031
- Muted Blue #3B719F ΔE 0.033
- Nice Blue #107AB0 ΔE 0.035
- Metallic Blue #4F738E ΔE 0.036
Use #3F7CA2 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.