#3749DB
Closest named color: Warm Blue (#4B57DB). oklch(49.2% 0.22 270.2), rgb(55, 73, 219).
Aa
White text reads best on this color (6.69:1).
About this color
#3749DB is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.220 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.042 away. White text reads best on it, at 6.69:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.220) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.13:1 |
| White text | 6.69:1 |
Values
| HEX | #3749DB |
| RGB | rgb(55, 73, 219) |
| HSL | hsl(233, 69%, 54%) |
| OKLCH | oklch(49.2% 0.22 270.2) |
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 #3749DB | 6.69:1 | AA | Lc -87.3 | Fine for body text |
| Black text on #3749DB | 3.13:1 | AA large text | Lc 21.8 | Dividers and decoration only |
| #3749DB text on white | 6.69:1 | AA | Lc 82.2 | Fine for body text |
| #3749DB text on black | 3.13:1 | AA large text | Lc -19.7 | Dividers and decoration only |
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 700.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7C99FF
oklch(70.6% 0.153 270.2)
-
Step 500
500
#5D7BFF
oklch(63% 0.198 270.2)
-
Step 600
600
#445BFB
oklch(55.7% 0.237 270.2)
-
Step 700
700 (this color)
#3749DB
oklch(49.2% 0.22 270.2)
-
Step 800
800
#2D3DB1
oklch(42.7% 0.183 270.3)
-
Step 900
900
#27368C
oklch(37.7% 0.143 270.4)
-
Step 950
950
#162152
oklch(27.1% 0.09 269.8)
#3749DB 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) | #0064E0 | 0.061 |
| Deuteranopia (no green cones) | #0054D8 | 0.036 |
| Tritanopia (no blue cones) | #00718C | 0.173 |
| Achromatopsia (no color) | #5C5C5C | 0.221 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3749DB
#3749DB
oklch(49.2% 0.22 270.2)
- #775E00
#775E00
oklch(49.3% 0.101 90.6)
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 #3749DB, closest first.
No curated palette has a color within ΔE 0.04 of #3749DB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.042
- Blue Blue #2242C7 ΔE 0.044
- Majorelle Blue #3F37C9 ΔE 0.046
- Azul #1D5DEC ΔE 0.051
- Blurple #5539CC ΔE 0.054
- Blue With A Hint Of Purple #533CC6 ΔE 0.055
- Electric Blue #0652FF ΔE 0.063
- Purpley Blue #5F34E7 ΔE 0.063
Use #3749DB 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.