#5370EB
Closest named color: Royal Blue (#4169E1). oklch(59% 0.188 269.8), rgb(83, 112, 235).
Aa
Black text reads best on this color (4.88:1).
About this color
#5370EB is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.188 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.032 away. Black text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.188) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.88:1 |
| White text | 4.29:1 |
Values
| HEX | #5370EB |
| RGB | rgb(83, 112, 235) |
| HSL | hsl(229, 79%, 62%) |
| OKLCH | oklch(59% 0.188 269.8) |
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 #5370EB | 4.29:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #5370EB | 4.88:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #5370EB text on white | 4.29:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #5370EB text on black | 4.88:1 | AA | Lc -32.3 | 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 600.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CDD8F9
oklch(88.4% 0.047 270.8)
-
Step 300
300
#ABBFF8
oklch(81% 0.084 269.5)
-
Step 400
400
#809BF5
oklch(70.7% 0.135 270)
-
Step 500
500
#617FF1
oklch(63.1% 0.174 269.8)
-
Step 600
600 (this color)
#5370EB
oklch(59% 0.188 269.8)
-
Step 700
700
#3C53C2
oklch(49.1% 0.175 269.9)
-
Step 800
800
#31459D
oklch(42.7% 0.145 269.6)
-
Step 900
900
#2B3B7D
oklch(37.7% 0.113 270)
-
Step 950
950
#192349
oklch(27% 0.072 270)
#5370EB 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) | #1F81EF | 0.051 |
| Deuteranopia (no green cones) | #0073E8 | 0.050 |
| Tritanopia (no blue cones) | #008DA3 | 0.156 |
| Achromatopsia (no color) | #7A7A7A | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5370EB
#5370EB
oklch(59% 0.188 269.8)
- #997900
#997900
oklch(59% 0.121 90.1)
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 #5370EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.032
- Cornflower #6A79F7 ΔE 0.042
- Neon Blue #4361EE ΔE 0.043
- Clear Blue #247AFD ΔE 0.046
- Cerulean Blue #056EEE ΔE 0.051
- Medium Slate Blue #7B68EE ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.056
- Warm Blue #4B57DB ΔE 0.065
Use #5370EB 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.