#3798DB
Closest named color: Dark Sky Blue (#448EE4). oklch(65.4% 0.134 243.2), rgb(55, 152, 219).
Aa
Black text reads best on this color (6.67:1).
About this color
#3798DB is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.134 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.033 away. Black text reads best on it, at 6.67:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.67:1 |
| White text | 3.14:1 |
Values
| HEX | #3798DB |
| RGB | rgb(55, 152, 219) |
| HSL | hsl(205, 69%, 54%) |
| OKLCH | oklch(65.4% 0.134 243.2) |
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 #3798DB | 3.14:1 | AA large text | Lc -63.6 | Content text, not long reading |
| Black text on #3798DB | 6.67:1 | AA | Lc 45.9 | Large or bold text, headings |
| #3798DB text on white | 3.14:1 | AA large text | Lc 58.2 | Large or bold text, headings |
| #3798DB text on black | 6.67:1 | AA | Lc -43.6 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF6
oklch(93.7% 0.019 243)
-
Step 200
200
#C5DDF0
oklch(88.6% 0.037 241.8)
-
Step 300
300
#9DC6E8
oklch(80.9% 0.065 243.7)
-
Step 400
400
#63A8DD
oklch(70.7% 0.105 243.2)
-
Step 500
500 (this color)
#3798DB
oklch(65.4% 0.134 243.2)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005483
oklch(42.8% 0.104 243)
-
Step 900
900
#07456C
oklch(37.6% 0.088 243.8)
-
Step 950
950
#09293F
oklch(27% 0.055 243)
#3798DB 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) | #799ADE | 0.062 |
| Deuteranopia (no green cones) | #628ADA | 0.048 |
| Tritanopia (no blue cones) | #00A8B0 | 0.092 |
| Achromatopsia (no color) | #919191 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3798DB
#3798DB
oklch(65.4% 0.134 243.2)
- #C97C27
#C97C27
oklch(65.5% 0.134 63.2)
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 #3798DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.033
- Chefchaouen Blue #4895EF ΔE 0.036
- Cornflower Blue #6495ED ΔE 0.049
- Water Blue #0E87CC ΔE 0.056
- Faded Blue #658CBB ΔE 0.059
- Soft Blue #6488EA ΔE 0.062
- Dodger Blue #1E90FF ΔE 0.063
- Cool Blue #4984B8 ΔE 0.067
Use #3798DB 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.