There is no limit regarding the trading activities but there are three tiers links to your deposit/withdrawal.
Tier 1: your cumulative deposits/ withdrawals are below CHF 5'000
Tier 2: your cumulative deposits/ withdrawals are below CHF 100'000
Tier 3: your cumulative deposits/ withdrawals are above CHF 100'000
To increase the limit of the transaction, you need to verify yourself with Proof of Residence (Tier 2) and Proof of Funds (Tier 3). You may do that if you tap on the menu button on the top left and choose Account Level. There, you’ll have an opportunity to raise your account level.
If your recent deposit/ withdrawal is above your tier limit, it will be blocked until you upgrade your tier level.
My current tier level is 1 and my cumulative deposit amounts to CHF 2000. I make a new deposit of CHF 1000, the funds will be directly credited into my account.
My current level is Tier 1 and my cumulative deposit amounts to CHF 4600. I make a new deposit of CHF 500, the funds will be blocked until my Tier level 2 is approved. Once done they will be automatically released.