#3F89BA
Closest named color: Cool Blue (#4984B8). oklch(60.5% 0.105 240.6), rgb(63, 137, 186).
Aa
Black text reads best on this color (5.49:1).
About this color
#3F89BA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.105 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.015 away. Black text reads best on it, at 5.49:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.49:1 |
| White text | 3.81:1 |
Values
| HEX | #3F89BA |
| RGB | rgb(63, 137, 186) |
| HSL | hsl(204, 49%, 49%) |
| OKLCH | oklch(60.5% 0.105 240.6) |
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 #3F89BA | 3.81:1 | AA large text | Lc -71.0 | Content text, not long reading |
| Black text on #3F89BA | 5.49:1 | AA | Lc 38.6 | Non-text elements, placeholder text |
| #3F89BA text on white | 3.81:1 | AA large text | Lc 65.5 | Content text, not long reading |
| #3F89BA 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEA
oklch(88.5% 0.028 239.7)
-
Step 300
300
#A4C6DF
oklch(81% 0.051 240.1)
-
Step 400
400
#71A8CF
oklch(70.8% 0.081 240.3)
-
Step 500
500 (this color)
#3F89BA
oklch(60.5% 0.105 240.6)
-
Step 600
600
#247BAF
oklch(55.7% 0.113 240.3)
-
Step 700
700
#146796
oklch(49.1% 0.105 240.3)
-
Step 800
800
#15547A
oklch(42.6% 0.088 240.7)
-
Step 900
900
#1A4662
oklch(37.8% 0.068 240)
-
Step 950
950
#112939
oklch(27% 0.042 240.1)
#3F89BA 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) | #7389BC | 0.055 |
| Deuteranopia (no green cones) | #627DB9 | 0.045 |
| Tritanopia (no blue cones) | #00959A | 0.074 |
| Achromatopsia (no color) | #828282 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F89BA
#3F89BA
oklch(60.5% 0.105 240.6)
- #AF723B
#AF723B
oklch(60.6% 0.105 60.7)
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 #3F89BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.015
- Steel Blue #4682B4 ΔE 0.020
- Off Blue #5684AE ΔE 0.026
- Blue NCS #118AB2 ΔE 0.028
- Dusty Blue #5A86AD ΔE 0.029
- Water Blue #0E87CC ΔE 0.037
- Faded Blue #658CBB ΔE 0.039
- Cerulean #457B9D ΔE 0.052
Use #3F89BA 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.