#3988F9
Closest named color: Dodger Blue (#1E90FF). oklch(63.7% 0.186 258), rgb(57, 136, 249).
Aa
Black text reads best on this color (6.06:1).
About this color
#3988F9 is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.186 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dodger Blue (#1E90FF), ΔE 0.022 away. Black text reads best on it, at 6.06:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.186) |
| Temperature | cool |
| Nearest name | Dodger Blue (#1E90FF) |
| Black text | 6.06:1 |
| White text | 3.46:1 |
Values
| HEX | #3988F9 |
| RGB | rgb(57, 136, 249) |
| HSL | hsl(215, 94%, 60%) |
| OKLCH | oklch(63.7% 0.186 258) |
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 #3988F9 | 3.46:1 | AA large text | Lc -67.2 | Content text, not long reading |
| Black text on #3988F9 | 6.06:1 | AA | Lc 42.4 | Non-text elements, placeholder text |
| #3988F9 text on white | 3.46:1 | AA large text | Lc 61.7 | Content text, not long reading |
| #3988F9 text on black | 6.06:1 | AA | Lc -40.0 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFB
oklch(88.5% 0.05 257.7)
-
Step 300
300
#9CC3FB
oklch(80.9% 0.09 257.4)
-
Step 400
400
#65A1FA
oklch(70.7% 0.145 258.1)
-
Step 500
500 (this color)
#3988F9
oklch(63.7% 0.186 258)
-
Step 600
600
#086CE6
oklch(55.5% 0.202 258.1)
-
Step 700
700
#005AC5
oklch(49.1% 0.183 258.1)
-
Step 800
800
#034AA2
oklch(42.8% 0.156 258)
-
Step 900
900
#103F80
oklch(37.7% 0.121 258)
-
Step 950
950
#0B254B
oklch(26.9% 0.077 258.3)
#3988F9 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) | #4B93FD | 0.034 |
| Deuteranopia (no green cones) | #1B82F7 | 0.024 |
| Tritanopia (no blue cones) | #00A3B4 | 0.144 |
| Achromatopsia (no color) | #8A8A8A | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3988F9
#3988F9
oklch(63.7% 0.186 258)
- #B77F00
#B77F00
oklch(63.7% 0.133 77.7)
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 #3988F9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dodger Blue #1E90FF ΔE 0.022
- Dark Sky Blue #448EE4 ΔE 0.039
- Clear Blue #247AFD ΔE 0.041
- Chefchaouen Blue #4895EF ΔE 0.043
- Soft Blue #6488EA ΔE 0.043
- Cornflower #6A79F7 ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.059
- Water Blue #0E87CC ΔE 0.073
Use #3988F9 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.