#3699CF
Closest named color: Dark Sky Blue (#448EE4). oklch(65% 0.121 237), rgb(54, 153, 207).
Aa
Black text reads best on this color (6.61:1).
About this color
#3699CF is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.121 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.050 away. Black text reads best on it, at 6.61:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.61:1 |
| White text | 3.17:1 |
Values
| HEX | #3699CF |
| RGB | rgb(54, 153, 207) |
| HSL | hsl(201, 61%, 51%) |
| OKLCH | oklch(65% 0.121 237) |
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 #3699CF | 3.17:1 | AA large text | Lc -64.0 | Content text, not long reading |
| Black text on #3699CF | 6.61:1 | AA | Lc 45.5 | Large or bold text, headings |
| #3699CF text on white | 3.17:1 | AA large text | Lc 58.5 | Large or bold text, headings |
| #3699CF text on black | 6.61:1 | AA | Lc -43.2 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF4
oklch(93.6% 0.017 236.7)
-
Step 200
200
#C6DDEC
oklch(88.5% 0.032 236.4)
-
Step 300
300
#9DC7E2
oklch(80.9% 0.059 236.7)
-
Step 400
400
#64A9D4
oklch(70.6% 0.094 237.5)
-
Step 500
500 (this color)
#3699CF
oklch(65% 0.121 237)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#074766
oklch(37.7% 0.079 237.1)
-
Step 950
950
#092A3C
oklch(27.1% 0.05 237)
#3699CF 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) | #7F99D1 | 0.069 |
| Deuteranopia (no green cones) | #6A8ACE | 0.057 |
| Tritanopia (no blue cones) | #00A7AC | 0.078 |
| Achromatopsia (no color) | #909090 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3699CF
#3699CF
oklch(65% 0.121 237)
- #C67A3E
#C67A3E
oklch(65% 0.121 56.6)
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 #3699CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.050
- Faded Blue #658CBB ΔE 0.051
- Chefchaouen Blue #4895EF ΔE 0.055
- Water Blue #0E87CC ΔE 0.057
- Cool Blue #4984B8 ΔE 0.060
- Blue NCS #118AB2 ΔE 0.061
- Cornflower Blue #6495ED ΔE 0.064
- Dusty Blue #5A86AD ΔE 0.065
Use #3699CF 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.