#3177AB
Closest named color: Flat Blue (#3C73A8). oklch(54.9% 0.107 244.2), rgb(49, 119, 171).
Aa
White text reads best on this color (4.81:1).
About this color
#3177AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.107 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.013 away. White text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.35:1 |
| White text | 4.81:1 |
Values
| HEX | #3177AB |
| RGB | rgb(49, 119, 171) |
| HSL | hsl(206, 55%, 43%) |
| OKLCH | oklch(54.9% 0.107 244.2) |
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 #3177AB | 4.81:1 | AA | Lc -78.6 | Fine for body text |
| Black text on #3177AB | 4.35:1 | AA large text | Lc 30.9 | Non-text elements, placeholder text |
| #3177AB text on white | 4.81:1 | AA | Lc 73.1 | Content text, not long reading |
| #3177AB text on black | 4.35:1 | AA large text | Lc -28.5 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CBDCEA
oklch(88.6% 0.027 242.8)
-
Step 300
300
#A7C5DE
oklch(81% 0.048 243.5)
-
Step 400
400
#77A6CE
oklch(70.7% 0.078 244.9)
-
Step 500
500
#5290C1
oklch(63.2% 0.098 244.1)
-
Step 600
600 (this color)
#3177AB
oklch(54.9% 0.107 244.2)
-
Step 700
700
#256695
oklch(49.2% 0.1 244)
-
Step 800
800
#215379
oklch(42.7% 0.083 244.6)
-
Step 900
900
#214561
oklch(37.7% 0.064 244.1)
-
Step 950
950
#142839
oklch(26.9% 0.041 245.8)
#3177AB 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) | #5F78AD | 0.047 |
| Deuteranopia (no green cones) | #4F6DAA | 0.037 |
| Tritanopia (no blue cones) | #008489 | 0.078 |
| Achromatopsia (no color) | #727272 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3177AB
#3177AB
oklch(54.9% 0.107 244.2)
- #9C6223
#9C6223
oklch(54.9% 0.107 63.9)
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 #3177AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.013
- Nice Blue #107AB0 ΔE 0.017
- Muted Blue #3B719F ΔE 0.022
- Dull Blue #49759C ΔE 0.029
- Windows Blue #3778BF ΔE 0.032
- Cerulean #457B9D ΔE 0.032
- French Blue #436BAD ΔE 0.036
- Ocean Blue #03719C ΔE 0.037
Use #3177AB 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.