#3A7FBF
Closest named color: Windows Blue (#3778BF). oklch(58.2% 0.121 249.2), rgb(58, 127, 191).
Aa
Black text reads best on this color (4.96:1).
About this color
#3A7FBF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.121 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.020 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.96:1 |
| White text | 4.22:1 |
Values
| HEX | #3A7FBF |
| RGB | rgb(58, 127, 191) |
| HSL | hsl(209, 53%, 49%) |
| OKLCH | oklch(58.2% 0.121 249.2) |
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 #3A7FBF | 4.22:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #3A7FBF | 4.96:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #3A7FBF text on white | 4.22:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #3A7FBF text on black | 4.96:1 | AA | Lc -32.8 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADBED
oklch(88.4% 0.031 249.7)
-
Step 300
300
#A6C4E3
oklch(80.9% 0.055 249.4)
-
Step 400
400
#76A5D5
oklch(70.7% 0.087 249.7)
-
Step 500
500
#508ECA
oklch(63.1% 0.111 249.3)
-
Step 600
600 (this color)
#3A7FBF
oklch(58.2% 0.121 249.2)
-
Step 700
700
#24649D
oklch(49.1% 0.112 249.1)
-
Step 800
800
#20527F
oklch(42.8% 0.092 248.8)
-
Step 900
900
#204466
oklch(37.7% 0.072 249.1)
-
Step 950
950
#13283C
oklch(27% 0.046 248.8)
#3A7FBF 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) | #6282C2 | 0.043 |
| Deuteranopia (no green cones) | #5075BE | 0.031 |
| Tritanopia (no blue cones) | #008E96 | 0.091 |
| Achromatopsia (no color) | #7B7B7B | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A7FBF
#3A7FBF
oklch(58.2% 0.121 249.2)
- #A86C13
#A86C13
oklch(58.2% 0.121 69.5)
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 #3A7FBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.020
- Steel Blue #4682B4 ΔE 0.023
- Cool Blue #4984B8 ΔE 0.024
- Water Blue #0E87CC ΔE 0.030
- Nice Blue #107AB0 ΔE 0.037
- Off Blue #5684AE ΔE 0.042
- Flat Blue #3C73A8 ΔE 0.044
- Blue NCS #118AB2 ΔE 0.045
Use #3A7FBF 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.