The quick answer is no, it is not. Roulette isn't rigged online for the same reason that the game isn't rigged in person, the casino doesn't need to rig the game to make their money! Double zero roulette, by far the most common version of the game being played today, has a built-in house advantage of just over 5%.
While there is no strategy that can guarantee a profit in the long run when playing roulette, the Martingale betting system is often regarded as the most successful strategy. It is easy to use and can provide good returns.
In the game of roulette, a player can place aR$5 bet on the number 25 and have a 1/38 probability of winning. If the metal ball lands on 25, the player gets to keep theR$5 paid to play the game and the player is awarded in additionalR$175. Otherwise, the player is awarded nothing and the casino takes the playerR$5.
The Martingale Strategy is arguably the best roulette strategy, and it's certainly one of the most famous ones. Simply put, you don't hold back when you lose; you do the opposite. Whenever you lose in roulette, the Martingale Strategy requires you to make your bet bigger than the previous one.
So you cannot make money consistently playing roulette, but you can make money occasionally when you defy the odds and have a lucky day. That is called variance, and it is what makes casino gambling fun and exciting provided you play within the limits of your budget.