#305FCB
Closest named color: Warm Blue (#4B57DB). oklch(51.6% 0.176 263.7), rgb(48, 95, 203).
Aa
White text reads best on this color (5.79:1).
About this color
#305FCB is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.176 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.041 away. White text reads best on it, at 5.79:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.176) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.62:1 |
| White text | 5.79:1 |
Values
| HEX | #305FCB |
| RGB | rgb(48, 95, 203) |
| HSL | hsl(222, 62%, 49%) |
| OKLCH | oklch(51.6% 0.176 263.7) |
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 #305FCB | 5.79:1 | AA | Lc -83.8 | Fine for body text |
| Black text on #305FCB | 3.62:1 | AA large text | Lc 25.6 | Dividers and decoration only |
| #305FCB text on white | 5.79:1 | AA | Lc 78.5 | Fine for body text |
| #305FCB text on black | 3.62:1 | AA large text | Lc -23.3 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C9DAF9
oklch(88.5% 0.047 262.5)
-
Step 300
300
#A4C1F8
oklch(80.9% 0.084 263)
-
Step 400
400
#749EF5
oklch(70.6% 0.136 263.7)
-
Step 500
500
#5183F1
oklch(63% 0.174 263.8)
-
Step 600
600
#366AE0
oklch(55.7% 0.189 263.5)
-
Step 700
700 (this color)
#305FCB
oklch(51.6% 0.176 263.7)
-
Step 800
800
#23489D
oklch(42.7% 0.145 263.7)
-
Step 900
900
#213D7D
oklch(37.6% 0.114 264)
-
Step 950
950
#142449
oklch(26.9% 0.072 264.5)
#305FCB 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) | #096DCF | 0.037 |
| Deuteranopia (no green cones) | #005FC9 | 0.024 |
| Tritanopia (no blue cones) | #00798C | 0.137 |
| Achromatopsia (no color) | #656565 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #305FCB
#305FCB
oklch(51.6% 0.176 263.7)
- #856100
#856100
oklch(51.6% 0.106 83.1)
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 #305FCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.041
- Royal Blue #4169E1 ΔE 0.046
- Mid Blue #276AB3 ΔE 0.051
- Azul #1D5DEC ΔE 0.052
- Neon Blue #4361EE ΔE 0.058
- Iris #6258C4 ΔE 0.061
- Cerulean Blue #056EEE ΔE 0.063
- French Blue #436BAD ΔE 0.064
Use #305FCB 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.