#3689EB
Closest named color: Dark Sky Blue (#448EE4). oklch(62.9% 0.168 254.9), rgb(54, 137, 235).
Aa
Black text reads best on this color (5.93:1).
About this color
#3689EB is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.168 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.022 away. Black text reads best on it, at 5.93:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.93:1 |
| White text | 3.53:1 |
Values
| HEX | #3689EB |
| RGB | rgb(54, 137, 235) |
| HSL | hsl(212, 82%, 57%) |
| OKLCH | oklch(62.9% 0.168 254.9) |
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 #3689EB | 3.53:1 | AA large text | Lc -68.0 | Content text, not long reading |
| Black text on #3689EB | 5.93:1 | AA | Lc 41.5 | Non-text elements, placeholder text |
| #3689EB text on white | 3.53:1 | AA large text | Lc 62.5 | Content text, not long reading |
| #3689EB text on black | 5.93:1 | AA | Lc -39.2 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C5DBF7
oklch(88.4% 0.045 254.5)
-
Step 300
300
#9DC4F5
oklch(81% 0.081 254.4)
-
Step 400
400
#65A3F1
oklch(70.7% 0.132 254.9)
-
Step 500
500 (this color)
#3689EB
oklch(62.9% 0.168 254.9)
-
Step 600
600
#0071DA
oklch(55.6% 0.182 254.8)
-
Step 700
700
#005FB9
oklch(49.2% 0.161 254.8)
-
Step 800
800
#004D99
oklch(42.7% 0.14 255)
-
Step 900
900
#0F417A
oklch(37.7% 0.11 255)
-
Step 950
950
#0B2747
oklch(27.1% 0.068 254.1)
#3689EB 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) | #5891EF | 0.038 |
| Deuteranopia (no green cones) | #3881E9 | 0.021 |
| Tritanopia (no blue cones) | #00A0AE | 0.128 |
| Achromatopsia (no color) | #888888 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3689EB
#3689EB
oklch(62.9% 0.168 254.9)
- #B77B00
#B77B00
oklch(62.9% 0.133 74.9)
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 #3689EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.022
- Dodger Blue #1E90FF ΔE 0.032
- Chefchaouen Blue #4895EF ΔE 0.037
- Soft Blue #6488EA ΔE 0.041
- Clear Blue #247AFD ΔE 0.052
- Water Blue #0E87CC ΔE 0.052
- Cornflower Blue #6495ED ΔE 0.055
- Cornflower #6A79F7 ΔE 0.064
Use #3689EB 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.