#375BDB
Closest named color: Warm Blue (#4B57DB). oklch(52.4% 0.2 267.1), rgb(55, 91, 219).
Aa
White text reads best on this color (5.70:1).
About this color
#375BDB is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.200 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.022 away. White text reads best on it, at 5.70:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.200) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.68:1 |
| White text | 5.70:1 |
Values
| HEX | #375BDB |
| RGB | rgb(55, 91, 219) |
| HSL | hsl(227, 69%, 54%) |
| OKLCH | oklch(52.4% 0.2 267.1) |
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 #375BDB | 5.70:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #375BDB | 3.68:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #375BDB text on white | 5.70:1 | AA | Lc 77.9 | Fine for body text |
| #375BDB text on black | 3.68:1 | AA large text | Lc -23.8 | 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 600.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FB
oklch(88.5% 0.05 266.5)
-
Step 300
300
#A7BFFC
oklch(80.9% 0.091 267.7)
-
Step 400
400
#789CFA
oklch(70.7% 0.144 266.9)
-
Step 500
500
#5880F7
oklch(63.2% 0.183 267.1)
-
Step 600
600 (this color)
#375BDB
oklch(52.4% 0.2 267.1)
-
Step 700
700
#3253C8
oklch(49.1% 0.186 267.1)
-
Step 800
800
#2945A2
oklch(42.7% 0.154 266.9)
-
Step 900
900
#253B80
oklch(37.6% 0.12 267.1)
-
Step 950
950
#16234B
oklch(26.9% 0.076 267.6)
#375BDB 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) | #006EDF | 0.048 |
| Deuteranopia (no green cones) | #005FD9 | 0.029 |
| Tritanopia (no blue cones) | #007B92 | 0.157 |
| Achromatopsia (no color) | #666666 | 0.200 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #375BDB
#375BDB
oklch(52.4% 0.2 267.1)
- #846500
#846500
oklch(52.3% 0.107 87.5)
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 #375BDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.022
- Azul #1D5DEC ΔE 0.031
- Neon Blue #4361EE ΔE 0.036
- Royal Blue #4169E1 ΔE 0.038
- Cerulean Blue #056EEE ΔE 0.053
- Bright Blue #0165FC ΔE 0.057
- Dark Periwinkle #665FD1 ΔE 0.063
- Iris #6258C4 ΔE 0.064
Use #375BDB 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.