#3988C4
Closest named color: Cool Blue (#4984B8). oklch(60.5% 0.119 244.7), rgb(57, 136, 196).
Aa
Black text reads best on this color (5.49:1).
About this color
#3988C4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.119 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.021 away. Black text reads best on it, at 5.49:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.49:1 |
| White text | 3.82:1 |
Values
| HEX | #3988C4 |
| RGB | rgb(57, 136, 196) |
| HSL | hsl(206, 55%, 50%) |
| OKLCH | oklch(60.5% 0.119 244.7) |
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 #3988C4 | 3.82:1 | AA large text | Lc -70.9 | Content text, not long reading |
| Black text on #3988C4 | 5.49:1 | AA | Lc 38.6 | Non-text elements, placeholder text |
| #3988C4 text on white | 3.82:1 | AA large text | Lc 65.4 | Content text, not long reading |
| #3988C4 text on black | 5.49:1 | AA | Lc -36.2 | 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 500.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEE
oklch(88.5% 0.033 245.3)
-
Step 300
300
#A2C5E4
oklch(80.8% 0.058 245.3)
-
Step 400
400
#6DA7D7
oklch(70.7% 0.093 244.6)
-
Step 500
500 (this color)
#3988C4
oklch(60.5% 0.119 244.7)
-
Step 600
600
#1979B9
oklch(55.6% 0.129 244.6)
-
Step 700
700
#0666A0
oklch(49.2% 0.121 244.5)
-
Step 800
800
#0E5381
oklch(42.7% 0.099 244.6)
-
Step 900
900
#164568
oklch(37.7% 0.078 244.8)
-
Step 950
950
#0F293D
oklch(27.1% 0.049 244.3)
#3988C4 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) | #6D8AC7 | 0.053 |
| Deuteranopia (no green cones) | #5A7CC3 | 0.041 |
| Tritanopia (no blue cones) | #00979D | 0.087 |
| Achromatopsia (no color) | #828282 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3988C4
#3988C4
oklch(60.5% 0.119 244.7)
- #B27126
#B27126
oklch(60.6% 0.119 65.1)
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 #3988C4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.021
- Water Blue #0E87CC ΔE 0.023
- Steel Blue #4682B4 ΔE 0.027
- Blue NCS #118AB2 ΔE 0.037
- Off Blue #5684AE ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.043
- Windows Blue #3778BF ΔE 0.045
- Faded Blue #658CBB ΔE 0.046
Use #3988C4 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.