#3699EC
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.5% 0.153 248.1), rgb(54, 153, 236).
Aa
Black text reads best on this color (6.92:1).
About this color
#3699EC is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.153 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.016 away. Black text reads best on it, at 6.92:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.92:1 |
| White text | 3.03:1 |
Values
| HEX | #3699EC |
| RGB | rgb(54, 153, 236) |
| HSL | hsl(207, 83%, 57%) |
| OKLCH | oklch(66.5% 0.153 248.1) |
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 #3699EC | 3.03:1 | AA large text | Lc -62.1 | Content text, not long reading |
| Black text on #3699EC | 6.92:1 | AA | Lc 47.4 | Large or bold text, headings |
| #3699EC text on white | 3.03:1 | AA large text | Lc 56.7 | Large or bold text, headings |
| #3699EC text on black | 6.92:1 | AA | Lc -45.1 | Large or bold text, headings |
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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C4DCF4
oklch(88.4% 0.042 248.3)
-
Step 300
300
#9BC5EF
oklch(80.8% 0.075 248.8)
-
Step 400
400
#60A6E7
oklch(70.6% 0.119 248.2)
-
Step 500
500 (this color)
#3699EC
oklch(66.5% 0.153 248.1)
-
Step 600
600
#0077C6
oklch(55.6% 0.15 248.2)
-
Step 700
700
#0064A7
oklch(49.1% 0.132 247.9)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#034473
oklch(37.7% 0.099 247.9)
-
Step 950
950
#072843
oklch(26.9% 0.063 247.7)
#3699EC 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) | #729DEF | 0.055 |
| Deuteranopia (no green cones) | #588DEA | 0.037 |
| Tritanopia (no blue cones) | #00ADB7 | 0.111 |
| Achromatopsia (no color) | #949494 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3699EC
#3699EC
oklch(66.5% 0.153 248.1)
- #CD8000
#CD8000
oklch(66.6% 0.146 68.3)
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 #3699EC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.016
- Dark Sky Blue #448EE4 ΔE 0.029
- Cornflower Blue #6495ED ΔE 0.037
- Dodger Blue #1E90FF ΔE 0.042
- Soft Blue #6488EA ΔE 0.053
- Water Blue #0E87CC ΔE 0.069
- Faded Blue #658CBB ΔE 0.078
- Cool Blue #4984B8 ΔE 0.086
Use #3699EC 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.