#375FDD
Closest named color: Warm Blue (#4B57DB). oklch(53.3% 0.198 266.3), rgb(55, 95, 221).
Aa
White text reads best on this color (5.46:1).
About this color
#375FDD is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.198 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.026 away. White text reads best on it, at 5.46:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.198) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.84:1 |
| White text | 5.46:1 |
Values
| HEX | #375FDD |
| RGB | rgb(55, 95, 221) |
| HSL | hsl(226, 71%, 54%) |
| OKLCH | oklch(53.3% 0.198 266.3) |
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 #375FDD | 5.46:1 | AA | Lc -82.0 | Fine for body text |
| Black text on #375FDD | 3.84:1 | AA large text | Lc 27.4 | Dividers and decoration only |
| #375FDD text on white | 5.46:1 | AA | Lc 76.7 | Fine for body text |
| #375FDD text on black | 3.84:1 | AA large text | Lc -25.0 | 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
#A6C0FB
oklch(81% 0.089 266)
-
Step 400
400
#779CF9
oklch(70.6% 0.143 266.4)
-
Step 500
500
#5681F6
oklch(63.2% 0.181 266.2)
-
Step 600
600 (this color)
#375FDD
oklch(53.3% 0.198 266.3)
-
Step 700
700
#3054C7
oklch(49.1% 0.184 266.3)
-
Step 800
800
#2846A1
oklch(42.8% 0.152 266.2)
-
Step 900
900
#243C80
oklch(37.8% 0.119 266.2)
-
Step 950
950
#15244B
oklch(27.1% 0.075 265.8)
#375FDD 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) | #0071E1 | 0.046 |
| Deuteranopia (no green cones) | #0062DB | 0.028 |
| Tritanopia (no blue cones) | #007E95 | 0.155 |
| Achromatopsia (no color) | #696969 | 0.198 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #375FDD
#375FDD
oklch(53.3% 0.198 266.3)
- #886700
#886700
oklch(53.2% 0.109 86.5)
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 #375FDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.026
- Royal Blue #4169E1 ΔE 0.028
- Neon Blue #4361EE ΔE 0.030
- Azul #1D5DEC ΔE 0.030
- Cerulean Blue #056EEE ΔE 0.045
- Bright Blue #0165FC ΔE 0.052
- Dark Periwinkle #665FD1 ΔE 0.060
- Iris #6258C4 ΔE 0.064
Use #375FDD 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.