#3691EE
Closest named color: Dark Sky Blue (#448EE4). oklch(64.9% 0.163 252.3), rgb(54, 145, 238).
Aa
Black text reads best on this color (6.44:1).
About this color
#3691EE is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.163 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.017 away. Black text reads best on it, at 6.44:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.44:1 |
| White text | 3.26:1 |
Values
| HEX | #3691EE |
| RGB | rgb(54, 145, 238) |
| HSL | hsl(210, 84%, 57%) |
| OKLCH | oklch(64.9% 0.163 252.3) |
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 #3691EE | 3.26:1 | AA large text | Lc -64.9 | Content text, not long reading |
| Black text on #3691EE | 6.44:1 | AA | Lc 44.6 | Non-text elements, placeholder text |
| #3691EE text on white | 3.26:1 | AA large text | Lc 59.5 | Large or bold text, headings |
| #3691EE text on black | 6.44:1 | AA | Lc -42.2 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF6
oklch(88.6% 0.044 251.5)
-
Step 300
300
#9CC4F3
oklch(80.8% 0.079 252.8)
-
Step 400
400
#62A4EE
oklch(70.6% 0.128 252.5)
-
Step 500
500 (this color)
#3691EE
oklch(64.9% 0.163 252.3)
-
Step 600
600
#0074D1
oklch(55.7% 0.167 252.1)
-
Step 700
700
#0061B1
oklch(49.1% 0.148 252.3)
-
Step 800
800
#004F92
oklch(42.6% 0.129 252.3)
-
Step 900
900
#094278
oklch(37.7% 0.107 252.5)
-
Step 950
950
#092746
oklch(26.9% 0.068 252.4)
#3691EE 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) | #6497F2 | 0.044 |
| Deuteranopia (no green cones) | #4787EC | 0.027 |
| Tritanopia (no blue cones) | #00A7B4 | 0.122 |
| Achromatopsia (no color) | #8E8E8E | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3691EE
#3691EE
oklch(64.9% 0.163 252.3)
- #C27E00
#C27E00
oklch(64.8% 0.139 71.7)
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 #3691EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.017
- Chefchaouen Blue #4895EF ΔE 0.018
- Dodger Blue #1E90FF ΔE 0.028
- Cornflower Blue #6495ED ΔE 0.042
- Soft Blue #6488EA ΔE 0.042
- Water Blue #0E87CC ΔE 0.060
- Clear Blue #247AFD ΔE 0.069
- Cornflower #6A79F7 ΔE 0.074
Use #3691EE 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.