#3699ED
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.6% 0.154 248.4), rgb(54, 153, 237).
Aa
Black text reads best on this color (6.93:1).
About this color
#3699ED is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.154 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.015 away. Black text reads best on it, at 6.93:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.93:1 |
| White text | 3.02:1 |
Values
| HEX | #3699ED |
| RGB | rgb(54, 153, 237) |
| HSL | hsl(208, 84%, 57%) |
| OKLCH | oklch(66.6% 0.154 248.4) |
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 #3699ED | 3.02:1 | AA large text | Lc -62.0 | Content text, not long reading |
| Black text on #3699ED | 6.93:1 | AA | Lc 47.4 | Large or bold text, headings |
| #3699ED text on white | 3.02:1 | AA large text | Lc 56.6 | Large or bold text, headings |
| #3699ED text on black | 6.93:1 | AA | Lc -45.2 | 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
#9BC5F0
oklch(80.9% 0.076 249.4)
-
Step 400
400
#60A6E8
oklch(70.7% 0.12 248.6)
-
Step 500
500 (this color)
#3699ED
oklch(66.6% 0.154 248.4)
-
Step 600
600
#0077C6
oklch(55.6% 0.15 248.2)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#00518B
oklch(42.6% 0.117 248.8)
-
Step 900
900
#034474
oklch(37.8% 0.101 248.4)
-
Step 950
950
#072844
oklch(27% 0.064 248.5)
#3699ED 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) | #729DF0 | 0.054 |
| Deuteranopia (no green cones) | #578DEB | 0.036 |
| Tritanopia (no blue cones) | #00ADB8 | 0.111 |
| Achromatopsia (no color) | #949494 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3699ED
#3699ED
oklch(66.6% 0.154 248.4)
- #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 #3699ED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.015
- Dark Sky Blue #448EE4 ΔE 0.030
- Cornflower Blue #6495ED ΔE 0.037
- Dodger Blue #1E90FF ΔE 0.041
- Soft Blue #6488EA ΔE 0.053
- Water Blue #0E87CC ΔE 0.070
- Faded Blue #658CBB ΔE 0.080
- Cool Blue #4984B8 ΔE 0.088
Use #3699ED 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.