#3F7AAA
Closest named color: Flat Blue (#3C73A8). oklch(56.1% 0.097 245.3), rgb(63, 122, 170).
Aa
White text reads best on this color (4.58:1).
About this color
#3F7AAA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.097 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.021 away. White text reads best on it, at 4.58:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.57:1 |
| White text | 4.58:1 |
Values
| HEX | #3F7AAA |
| RGB | rgb(63, 122, 170) |
| HSL | hsl(207, 46%, 46%) |
| OKLCH | oklch(56.1% 0.097 245.3) |
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 #3F7AAA | 4.58:1 | AA | Lc -77.1 | Fine for body text |
| Black text on #3F7AAA | 4.57:1 | AA | Lc 32.4 | Non-text elements, placeholder text |
| #3F7AAA text on white | 4.58:1 | AA | Lc 71.7 | Content text, not long reading |
| #3F7AAA text on black | 4.57:1 | AA | Lc -30.0 | Dividers and decoration only |
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
#CCDBE9
oklch(88.4% 0.025 246.2)
-
Step 300
300
#AAC4DC
oklch(80.9% 0.044 246.2)
-
Step 400
400
#7CA6CA
oklch(70.8% 0.07 244.9)
-
Step 500
500
#598FBC
oklch(63.1% 0.089 245)
-
Step 600
600 (this color)
#3F7AAA
oklch(56.1% 0.097 245.3)
-
Step 700
700
#2F6590
oklch(49% 0.09 245.2)
-
Step 800
800
#285375
oklch(42.8% 0.074 244.7)
-
Step 900
900
#25455F
oklch(37.8% 0.059 244.8)
-
Step 950
950
#162837
oklch(26.9% 0.037 244.9)
#3F7AAA 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) | #657BAC | 0.043 |
| Deuteranopia (no green cones) | #5671A9 | 0.032 |
| Tritanopia (no blue cones) | #00868B | 0.075 |
| Achromatopsia (no color) | #757575 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F7AAA
#3F7AAA
oklch(56.1% 0.097 245.3)
- #9C6831
#9C6831
oklch(56.2% 0.097 64.9)
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 #3F7AAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.021
- Cerulean #457B9D ΔE 0.022
- Dull Blue #49759C ΔE 0.023
- Steel Blue #4682B4 ΔE 0.027
- Nice Blue #107AB0 ΔE 0.027
- Stormy Blue #507B9C ΔE 0.028
- Muted Blue #3B719F ΔE 0.029
- Windows Blue #3778BF ΔE 0.035
Use #3F7AAA 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.