#3979A7
Closest named color: Flat Blue (#3C73A8). oklch(55.5% 0.097 242.6), rgb(57, 121, 167).
Aa
White text reads best on this color (4.70:1).
About this color
#3979A7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.097 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.018 away. White text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.46:1 |
| White text | 4.70:1 |
Values
| HEX | #3979A7 |
| RGB | rgb(57, 121, 167) |
| HSL | hsl(205, 49%, 44%) |
| OKLCH | oklch(55.5% 0.097 242.6) |
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 #3979A7 | 4.70:1 | AA | Lc -77.9 | Fine for body text |
| Black text on #3979A7 | 4.46:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #3979A7 text on white | 4.70:1 | AA | Lc 72.4 | Content text, not long reading |
| #3979A7 text on black | 4.46:1 | AA large text | Lc -29.3 | 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
#CCDBE8
oklch(88.4% 0.024 244.2)
-
Step 300
300
#A9C5DB
oklch(81% 0.043 241.8)
-
Step 400
400
#7AA6C9
oklch(70.6% 0.07 242.9)
-
Step 500
500
#5690BB
oklch(63.1% 0.089 242.1)
-
Step 600
600 (this color)
#3979A7
oklch(55.5% 0.097 242.6)
-
Step 700
700
#2B6690
oklch(49.1% 0.091 242.8)
-
Step 800
800
#255375
oklch(42.6% 0.076 243.3)
-
Step 900
900
#23455E
oklch(37.7% 0.059 242.4)
-
Step 950
950
#152937
oklch(27.1% 0.037 240.5)
#3979A7 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) | #647AA9 | 0.047 |
| Deuteranopia (no green cones) | #556FA6 | 0.037 |
| Tritanopia (no blue cones) | #008489 | 0.071 |
| Achromatopsia (no color) | #747474 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3979A7
#3979A7
oklch(55.5% 0.097 242.6)
- #9B6531
#9B6531
oklch(55.5% 0.097 62.3)
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 #3979A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.018
- Cerulean #457B9D ΔE 0.021
- Dull Blue #49759C ΔE 0.021
- Muted Blue #3B719F ΔE 0.024
- Nice Blue #107AB0 ΔE 0.024
- Stormy Blue #507B9C ΔE 0.029
- Steel Blue #4682B4 ΔE 0.034
- Windows Blue #3778BF ΔE 0.039
Use #3979A7 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.