#3F89B2
Closest named color: Cool Blue (#4984B8). oklch(60.1% 0.096 235.8), rgb(63, 137, 178).
Aa
Black text reads best on this color (5.43:1).
About this color
#3F89B2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.096 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.020 away. Black text reads best on it, at 5.43:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.43:1 |
| White text | 3.86:1 |
Values
| HEX | #3F89B2 |
| RGB | rgb(63, 137, 178) |
| HSL | hsl(201, 48%, 47%) |
| OKLCH | oklch(60.1% 0.096 235.8) |
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 #3F89B2 | 3.86:1 | AA large text | Lc -71.4 | Content text, not long reading |
| Black text on #3F89B2 | 5.43:1 | AA | Lc 38.2 | Non-text elements, placeholder text |
| #3F89B2 text on white | 3.86:1 | AA large text | Lc 65.9 | Content text, not long reading |
| #3F89B2 text on black | 5.43:1 | AA | Lc -35.8 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A4C6DB
oklch(80.9% 0.047 235.3)
-
Step 400
400
#72A8C9
oklch(70.6% 0.075 236.1)
-
Step 500
500 (this color)
#3F89B2
oklch(60.1% 0.096 235.8)
-
Step 600
600
#257CA8
oklch(55.6% 0.105 235.7)
-
Step 700
700
#166890
oklch(49% 0.097 236)
-
Step 800
800
#175575
oklch(42.7% 0.081 236.2)
-
Step 900
900
#1B465E
oklch(37.6% 0.063 236.3)
-
Step 950
950
#112937
oklch(26.9% 0.04 236.4)
#3F89B2 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) | #7688B4 | 0.059 |
| Deuteranopia (no green cones) | #667CB1 | 0.050 |
| Tritanopia (no blue cones) | #009497 | 0.066 |
| Achromatopsia (no color) | #828282 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F89B2
#3F89B2
oklch(60.1% 0.096 235.8)
- #AC7045
#AC7045
oklch(60% 0.096 55.4)
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 #3F89B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.020
- Steel Blue #4682B4 ΔE 0.021
- Blue NCS #118AB2 ΔE 0.023
- Off Blue #5684AE ΔE 0.023
- Dusty Blue #5A86AD ΔE 0.025
- Faded Blue #658CBB ΔE 0.042
- Teal Blue #01889F ΔE 0.043
- Cerulean #457B9D ΔE 0.045
Use #3F89B2 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.