#3989BC
Closest named color: Cool Blue (#4984B8). oklch(60.3% 0.11 240.2), rgb(57, 137, 188).
Aa
Black text reads best on this color (5.47:1).
About this color
#3989BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.110 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.017 away. Black text reads best on it, at 5.47:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.47:1 |
| White text | 3.83:1 |
Values
| HEX | #3989BC |
| RGB | rgb(57, 137, 188) |
| HSL | hsl(203, 53%, 48%) |
| OKLCH | oklch(60.3% 0.11 240.2) |
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 #3989BC | 3.83:1 | AA large text | Lc -71.0 | Content text, not long reading |
| Black text on #3989BC | 5.47:1 | AA | Lc 38.5 | Non-text elements, placeholder text |
| #3989BC text on white | 3.83:1 | AA large text | Lc 65.5 | Content text, not long reading |
| #3989BC text on black | 5.47:1 | AA | Lc -36.1 | 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
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C8DCEB
oklch(88.4% 0.03 240.2)
-
Step 300
300
#A2C6E0
oklch(80.9% 0.053 239.7)
-
Step 400
400
#6DA8D1
oklch(70.7% 0.086 239.9)
-
Step 500
500 (this color)
#3989BC
oklch(60.3% 0.11 240.2)
-
Step 600
600
#1A7BB2
oklch(55.7% 0.119 240.3)
-
Step 700
700
#066799
oklch(49.1% 0.111 240.5)
-
Step 800
800
#0E547C
oklch(42.6% 0.092 240.7)
-
Step 900
900
#164664
oklch(37.7% 0.072 240.3)
-
Step 950
950
#0F293A
oklch(26.9% 0.045 240)
#3989BC 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) | #7189BE | 0.057 |
| Deuteranopia (no green cones) | #5F7DBB | 0.045 |
| Tritanopia (no blue cones) | #00969B | 0.076 |
| Achromatopsia (no color) | #828282 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3989BC
#3989BC
oklch(60.3% 0.11 240.2)
- #B07036
#B07036
oklch(60.3% 0.109 60.4)
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 #3989BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.017
- Steel Blue #4682B4 ΔE 0.021
- Blue NCS #118AB2 ΔE 0.026
- Off Blue #5684AE ΔE 0.031
- Water Blue #0E87CC ΔE 0.032
- Dusty Blue #5A86AD ΔE 0.034
- Faded Blue #658CBB ΔE 0.044
- Windows Blue #3778BF ΔE 0.050
Use #3989BC 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.