#3677AA
Closest named color: Flat Blue (#3C73A8). oklch(55% 0.104 245), rgb(54, 119, 170).
Aa
White text reads best on this color (4.79:1).
About this color
#3677AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.104 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.011 away. White text reads best on it, at 4.79:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.37:1 |
| White text | 4.79:1 |
Values
| HEX | #3677AA |
| RGB | rgb(54, 119, 170) |
| HSL | hsl(206, 52%, 44%) |
| OKLCH | oklch(55% 0.104 245) |
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 #3677AA | 4.79:1 | AA | Lc -78.5 | Fine for body text |
| Black text on #3677AA | 4.37:1 | AA large text | Lc 31.0 | Non-text elements, placeholder text |
| #3677AA text on white | 4.79:1 | AA | Lc 73.0 | Content text, not long reading |
| #3677AA text on black | 4.37:1 | AA large text | Lc -28.6 | 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
#CCDBEA
oklch(88.5% 0.026 248.1)
-
Step 300
300
#A8C4DD
oklch(80.8% 0.047 245.4)
-
Step 400
400
#79A6CC
oklch(70.7% 0.074 244.6)
-
Step 500
500
#558FBF
oklch(63% 0.095 245.1)
-
Step 600
600 (this color)
#3677AA
oklch(55% 0.104 245)
-
Step 700
700
#2A6594
oklch(49.1% 0.097 245.8)
-
Step 800
800
#245378
oklch(42.8% 0.08 245.1)
-
Step 900
900
#234560
oklch(37.8% 0.061 244.4)
-
Step 950
950
#152838
oklch(26.9% 0.039 245.4)
#3677AA 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) | #6078AC | 0.045 |
| Deuteranopia (no green cones) | #506DA9 | 0.035 |
| Tritanopia (no blue cones) | #008389 | 0.076 |
| Achromatopsia (no color) | #727272 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3677AA
#3677AA
oklch(55% 0.104 245)
- #9B6426
#9B6426
oklch(55.2% 0.104 65.4)
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 #3677AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.011
- Nice Blue #107AB0 ΔE 0.020
- Muted Blue #3B719F ΔE 0.021
- Dull Blue #49759C ΔE 0.026
- Cerulean #457B9D ΔE 0.029
- Windows Blue #3778BF ΔE 0.033
- French Blue #436BAD ΔE 0.036
- Stormy Blue #507B9C ΔE 0.037
Use #3677AA 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.