#3990BF
Closest named color: Cool Blue (#4984B8). oklch(62.2% 0.108 236.1), rgb(57, 144, 191).
Aa
Black text reads best on this color (5.91:1).
About this color
#3990BF is a medium-light, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.108 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.033 away. Black text reads best on it, at 5.91:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.91:1 |
| White text | 3.54:1 |
Values
| HEX | #3990BF |
| RGB | rgb(57, 144, 191) |
| HSL | hsl(201, 54%, 49%) |
| OKLCH | oklch(62.2% 0.108 236.1) |
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 #3990BF | 3.54:1 | AA large text | Lc -68.3 | Content text, not long reading |
| Black text on #3990BF | 5.91:1 | AA | Lc 41.3 | Non-text elements, placeholder text |
| #3990BF text on white | 3.54:1 | AA large text | Lc 62.8 | Content text, not long reading |
| #3990BF text on black | 5.91:1 | AA | Lc -38.9 | 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
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C8DDEA
oklch(88.6% 0.029 234.9)
-
Step 300
300
#A1C7DF
oklch(81% 0.053 236)
-
Step 400
400
#6AA9CF
oklch(70.7% 0.086 236.2)
-
Step 500
500 (this color)
#3990BF
oklch(62.2% 0.108 236.1)
-
Step 600
600
#087CAF
oklch(55.5% 0.119 236.6)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#03557A
oklch(42.6% 0.091 236.8)
-
Step 900
900
#124762
oklch(37.8% 0.071 235.8)
-
Step 950
950
#0D2A39
oklch(27.1% 0.044 234.3)
#3990BF 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) | #7A8FC1 | 0.065 |
| Deuteranopia (no green cones) | #6782BE | 0.054 |
| Tritanopia (no blue cones) | #009CA0 | 0.071 |
| Achromatopsia (no color) | #888888 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3990BF
#3990BF
oklch(62.2% 0.108 236.1)
- #B87441
#B87441
oklch(62.1% 0.109 55.9)
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 #3990BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.033
- Blue NCS #118AB2 ΔE 0.033
- Steel Blue #4682B4 ΔE 0.039
- Faded Blue #658CBB ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.040
- Off Blue #5684AE ΔE 0.040
- Water Blue #0E87CC ΔE 0.042
- Teal Blue #01889F ΔE 0.059
Use #3990BF 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.