Warm Blue #4B57DB
Warm Blue is a medium-dark, vivid blue with hex code #4B57DB and RGB rgb(75, 87, 219).
Aa
White text reads best on this color (5.69:1).
About this color
#4B57DB is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.199 and its hue 273°. Its hue sits on the cool side of the wheel. It is the named color Warm Blue. White text reads best on it, at 5.69:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.199) |
| Temperature | cool |
| Nearest name | Warm Blue |
| Black text | 3.68:1 |
| White text | 5.69:1 |
Colors that go with Warm Blue
Matches found by rotating Warm Blue around the OKLCH hue wheel, each labelled with the closest name in our list.
Complementary
The opposite hue (180°).
Analogous
Neighbouring hues, 30° either side.
Triadic
Three hues spaced 120° apart.
Color palettes with Warm Blue
Curated color palettes that contain a color within ΔE 0.06 (OKLab) of Warm Blue, closest first.
Similar named colors
The eight named colors closest to Warm Blue, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.036
- Royal Blue #4169E1 ΔE 0.042
- Azul #1D5DEC ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.047
- Iris #6258C4 ΔE 0.048
- Slate Blue #6A5ACD ΔE 0.051
- Light Indigo #6D5ACF ΔE 0.054
- Bluey Purple #6241C7 ΔE 0.062
More about Warm Blue
How to make Warm Blue
A starting recipe from common paint colors, found with a spectral paint model (the color mixer’s paint mode). Real pigments vary, so mix a small test batch and adjust.
- 2 parts blue
- 1 part purple
- 1 part white
Recipe result: #4264C4, a difference of ΔE 0.050 from Warm Blue. That is close; add a little more of one paint to match.
Codes for Warm Blue in every format
| HEX | #4B57DB |
| RGB | rgb(75, 87, 219) |
| HSL | hsl(235, 67%, 58%) |
| OKLCH | oklch(52.7% 0.199 273.4) |
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 #4B57DB | 5.69:1 | AA | Lc -83.3 | Fine for body text |
| Black text on #4B57DB | 3.68:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #4B57DB text on white | 5.69:1 | AA | Lc 78.0 | Fine for body text |
| #4B57DB text on black | 3.68:1 | AA large text | Lc -23.8 | Dividers and decoration only |
Shades and tints of Warm Blue
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 600.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CED8FB
oklch(88.6% 0.049 272.8)
-
Step 300
300
#AEBDFB
oklch(80.9% 0.089 273.7)
-
Step 400
400
#8498F9
oklch(70.6% 0.144 273.4)
-
Step 500
500
#687BF6
oklch(63% 0.183 273.4)
-
Step 600
600 (this color)
#4B57DB
oklch(52.7% 0.199 273.4)
-
Step 700
700
#444FC7
oklch(49.2% 0.185 273.5)
-
Step 800
800
#3741A1
oklch(42.6% 0.154 273.4)
-
Step 900
900
#2F3980
oklch(37.8% 0.119 273.3)
-
Step 950
950
#1B224B
oklch(27% 0.076 273)
Warm Blue 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) | #006DDF | 0.063 |
| Deuteranopia (no green cones) | #0060D8 | 0.051 |
| Tritanopia (no blue cones) | #007891 | 0.163 |
| Achromatopsia (no color) | #676767 | 0.200 |
Use Warm Blue 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.