#3F7AAE
Closest named color: Flat Blue (#3C73A8). oklch(56.3% 0.102 247.3), rgb(63, 122, 174).
Aa
Black text reads best on this color (4.60:1).
About this color
#3F7AAE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.102 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.021 away. Black text reads best on it, at 4.60:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.60:1 |
| White text | 4.55:1 |
Values
| HEX | #3F7AAE |
| RGB | rgb(63, 122, 174) |
| HSL | hsl(208, 47%, 46%) |
| OKLCH | oklch(56.3% 0.102 247.3) |
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 #3F7AAE | 4.55:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #3F7AAE | 4.60:1 | AA | Lc 32.6 | Non-text elements, placeholder text |
| #3F7AAE text on white | 4.55:1 | AA | Lc 71.5 | Content text, not long reading |
| #3F7AAE text on black | 4.60:1 | AA | Lc -30.2 | 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
#CCDBEA
oklch(88.5% 0.026 248.1)
-
Step 300
300
#AAC4DD
oklch(80.9% 0.045 247.3)
-
Step 400
400
#7CA5CC
oklch(70.7% 0.073 247.6)
-
Step 500
500
#598EBF
oklch(63% 0.093 247.7)
-
Step 600
600 (this color)
#3F7AAE
oklch(56.3% 0.102 247.3)
-
Step 700
700
#2F6593
oklch(49.2% 0.094 246.9)
-
Step 800
800
#285278
oklch(42.7% 0.079 248)
-
Step 900
900
#254460
oklch(37.6% 0.061 247.4)
-
Step 950
950
#162838
oklch(26.9% 0.038 246.6)
#3F7AAE 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) | #637CB0 | 0.041 |
| Deuteranopia (no green cones) | #5471AD | 0.031 |
| Tritanopia (no blue cones) | #00868C | 0.079 |
| Achromatopsia (no color) | #767676 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F7AAE
#3F7AAE
oklch(56.3% 0.102 247.3)
- #9D692B
#9D692B
oklch(56.4% 0.102 67.6)
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 #3F7AAE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.021
- Steel Blue #4682B4 ΔE 0.025
- Nice Blue #107AB0 ΔE 0.027
- Cerulean #457B9D ΔE 0.028
- Dull Blue #49759C ΔE 0.029
- Windows Blue #3778BF ΔE 0.029
- Muted Blue #3B719F ΔE 0.032
- Stormy Blue #507B9C ΔE 0.033
Use #3F7AAE 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.