#3787D5
Closest named color: Water Blue (#0E87CC). oklch(61.2% 0.142 250.8), rgb(55, 135, 213).
Aa
Black text reads best on this color (5.58:1).
About this color
#3787D5 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.142 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.024 away. Black text reads best on it, at 5.58:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.58:1 |
| White text | 3.75:1 |
Values
| HEX | #3787D5 |
| RGB | rgb(55, 135, 213) |
| HSL | hsl(210, 65%, 53%) |
| OKLCH | oklch(61.2% 0.142 250.8) |
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 #3787D5 | 3.75:1 | AA large text | Lc -70.3 | Content text, not long reading |
| Black text on #3787D5 | 5.58:1 | AA | Lc 39.3 | Non-text elements, placeholder text |
| #3787D5 text on white | 3.75:1 | AA large text | Lc 64.8 | Content text, not long reading |
| #3787D5 text on black | 5.58:1 | AA | Lc -36.9 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF2
oklch(88.6% 0.038 249.5)
-
Step 300
300
#A0C4ED
oklch(80.8% 0.07 252)
-
Step 400
400
#6AA5E3
oklch(70.7% 0.11 250.8)
-
Step 500
500 (this color)
#3787D5
oklch(61.2% 0.142 250.8)
-
Step 600
600
#1275C9
oklch(55.5% 0.154 251)
-
Step 700
700
#0062AD
oklch(49.1% 0.142 250.8)
-
Step 800
800
#08508D
oklch(42.6% 0.119 251.1)
-
Step 900
900
#144370
oklch(37.6% 0.092 251)
-
Step 950
950
#0D2842
oklch(27.1% 0.059 250.2)
#3787D5 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) | #638CD8 | 0.045 |
| Deuteranopia (no green cones) | #4B7DD3 | 0.029 |
| Tritanopia (no blue cones) | #0099A4 | 0.105 |
| Achromatopsia (no color) | #848484 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3787D5
#3787D5
oklch(61.2% 0.142 250.8)
- #B47400
#B47400
oklch(61.2% 0.132 71.3)
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 #3787D5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.024
- Dark Sky Blue #448EE4 ΔE 0.031
- Cool Blue #4984B8 ΔE 0.044
- Windows Blue #3778BF ΔE 0.049
- Steel Blue #4682B4 ΔE 0.050
- Chefchaouen Blue #4895EF ΔE 0.054
- Soft Blue #6488EA ΔE 0.054
- Faded Blue #658CBB ΔE 0.061
Use #3787D5 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.