There are only a few real ways to get Robux without paying. Everything else is a scam or a waste of time. Here is each method, honestly rated.
Surveys and offers (what FreeRBX does)
Effort: medium. Speed: days to first payout. Risk: low on legit platforms. The best effort-to-Robux ratio for most players — a few hundred Robux a week for answering questions in your spare time. Main downside: inventory varies by country.
Group payouts
Effort: low (once you are in). Speed: slow — group funds have pending holds too. Risk: medium; you depend on the group owner actually paying. Fine if you trust the group, but you cannot earn on demand.
Selling gamepasses and clothing
Effort: high — you need design or dev skills. Speed: slow at first. Risk: low. Best long-term method if you can build, but useless if you just want Robux this week.
Gift cards and events
Gift cards cost real money — they are not 'free' unless someone gives you one. Official Roblox events occasionally award free items (rarely Robux). Worth joining, but not a strategy.
The bottom line
For most players, surveys are the fastest legit path to a few hundred Robux: no skills needed, no money down, payout in days. Combine it with building skills long-term and you cover both horizons.