#303BB3
Closest named color: Sapphire (#2138AB). oklch(42.7% 0.187 271.6), rgb(48, 59, 179).
Aa
White text reads best on this color (8.74:1).
About this color
#303BB3 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.187 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.024 away. White text reads best on it, at 8.74:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.187) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.40:1 |
| White text | 8.74:1 |
Values
| HEX | #303BB3 |
| RGB | rgb(48, 59, 179) |
| HSL | hsl(235, 58%, 45%) |
| OKLCH | oklch(42.7% 0.187 271.6) |
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 #303BB3 | 8.74:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #303BB3 | 2.40:1 | Fails | Lc 14.7 | Not readable |
| #303BB3 text on white | 8.74:1 | AAA | Lc 89.2 | Fine for body text |
| #303BB3 text on black | 2.40:1 | Fails | Lc -13.0 | Not readable |
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 800.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#AABDFF
oklch(80.8% 0.096 271.7)
-
Step 400
400
#7F98FF
oklch(70.6% 0.153 271.7)
-
Step 500
500
#617AFF
oklch(63% 0.198 271.6)
-
Step 600
600
#4858FE
oklch(55.7% 0.243 271.5)
-
Step 700
700
#3B46DE
oklch(49.2% 0.226 271.5)
-
Step 800
800 (this color)
#303BB3
oklch(42.7% 0.187 271.6)
-
Step 900
900
#29358D
oklch(37.7% 0.145 271.6)
-
Step 950
950
#182053
oklch(27.1% 0.093 272)
#303BB3 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) | #0051B7 | 0.054 |
| Deuteranopia (no green cones) | #0045B1 | 0.035 |
| Tritanopia (no blue cones) | #005B72 | 0.147 |
| Achromatopsia (no color) | #4B4B4B | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303BB3
#303BB3
oklch(42.7% 0.187 271.6)
- #614D00
#614D00
oklch(42.9% 0.088 91.6)
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 #303BB3, closest first.
No curated palette has a color within ΔE 0.04 of #303BB3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.024
- Blue Blue #2242C7 ΔE 0.037
- Majorelle Blue #3F37C9 ΔE 0.040
- Indigo Blue #3A18B1 ΔE 0.056
- Blueberry #464196 ΔE 0.059
- Blue With A Hint Of Purple #533CC6 ΔE 0.060
- Blurple #5539CC ΔE 0.067
- Cobalt #1E488F ΔE 0.069
Use #303BB3 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.