#3D77D3
Closest named color: Windows Blue (#3778BF). oklch(57.7% 0.154 259.3), rgb(61, 119, 211).
Aa
Black text reads best on this color (4.77:1).
About this color
#3D77D3 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.154 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.033 away. Black text reads best on it, at 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.77:1 |
| White text | 4.39:1 |
Values
| HEX | #3D77D3 |
| RGB | rgb(61, 119, 211) |
| HSL | hsl(217, 63%, 53%) |
| OKLCH | oklch(57.7% 0.154 259.3) |
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 #3D77D3 | 4.39:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #3D77D3 | 4.77:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #3D77D3 text on white | 4.39:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #3D77D3 text on black | 4.77:1 | AA | Lc -31.5 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CADAF3
oklch(88.4% 0.039 259.3)
-
Step 300
300
#A6C2EE
oklch(80.9% 0.07 259.3)
-
Step 400
400
#76A1E6
oklch(70.6% 0.112 259.6)
-
Step 500
500
#5388DE
oklch(63% 0.142 259.6)
-
Step 600
600 (this color)
#3D77D3
oklch(57.7% 0.154 259.3)
-
Step 700
700
#295EB0
oklch(49.2% 0.142 259)
-
Step 800
800
#234D8F
oklch(42.7% 0.119 259.2)
-
Step 900
900
#224172
oklch(37.8% 0.092 259.2)
-
Step 950
950
#142643
oklch(27% 0.059 259.5)
#3D77D3 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) | #4A80D7 | 0.029 |
| Deuteranopia (no green cones) | #2E72D1 | 0.020 |
| Tritanopia (no blue cones) | #008C9B | 0.121 |
| Achromatopsia (no color) | #787878 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D77D3
#3D77D3
oklch(57.7% 0.154 259.3)
- #9F7000
#9F7000
oklch(57.8% 0.12 79.5)
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 #3D77D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.033
- Royal Blue #4169E1 ΔE 0.044
- Water Blue #0E87CC ΔE 0.049
- Cerulean Blue #056EEE ΔE 0.057
- French Blue #436BAD ΔE 0.062
- Cool Blue #4984B8 ΔE 0.062
- Mid Blue #276AB3 ΔE 0.063
- Steel Blue #4682B4 ΔE 0.063
Use #3D77D3 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.