#3989C0
Closest named color: Cool Blue (#4984B8). oklch(60.6% 0.114 242.2), rgb(57, 137, 192).
Aa
Black text reads best on this color (5.51:1).
About this color
#3989C0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.114 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.018 away. Black text reads best on it, at 5.51:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.51:1 |
| White text | 3.80:1 |
Values
| HEX | #3989C0 |
| RGB | rgb(57, 137, 192) |
| HSL | hsl(204, 54%, 49%) |
| OKLCH | oklch(60.6% 0.114 242.2) |
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 #3989C0 | 3.80:1 | AA large text | Lc -70.8 | Content text, not long reading |
| Black text on #3989C0 | 5.51:1 | AA | Lc 38.8 | Non-text elements, placeholder text |
| #3989C0 text on white | 3.80:1 | AA large text | Lc 65.3 | Content text, not long reading |
| #3989C0 text on black | 5.51:1 | AA | Lc -36.4 | 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
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C8DCEC
oklch(88.4% 0.031 242)
-
Step 300
300
#A2C6E2
oklch(81% 0.055 241.8)
-
Step 400
400
#6DA8D4
oklch(70.8% 0.089 241.8)
-
Step 500
500 (this color)
#3989C0
oklch(60.6% 0.114 242.2)
-
Step 600
600
#187AB5
oklch(55.6% 0.124 242.2)
-
Step 700
700
#05679C
oklch(49.2% 0.115 241.9)
-
Step 800
800
#0D547E
oklch(42.7% 0.095 241.8)
-
Step 900
900
#164665
oklch(37.8% 0.073 241.2)
-
Step 950
950
#0F293B
oklch(27% 0.046 241.6)
#3989C0 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) | #708AC2 | 0.056 |
| Deuteranopia (no green cones) | #5D7DBF | 0.043 |
| Tritanopia (no blue cones) | #00979C | 0.081 |
| Achromatopsia (no color) | #838383 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3989C0
#3989C0
oklch(60.6% 0.114 242.2)
- #B27130
#B27130
oklch(60.6% 0.114 62.4)
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 #3989C0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.018
- Steel Blue #4682B4 ΔE 0.024
- Water Blue #0E87CC ΔE 0.028
- Blue NCS #118AB2 ΔE 0.031
- Off Blue #5684AE ΔE 0.034
- Dusty Blue #5A86AD ΔE 0.038
- Faded Blue #658CBB ΔE 0.044
- Windows Blue #3778BF ΔE 0.049
Use #3989C0 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.