Warren Buffett says low-cost investments are essential for the average investor - here's how much it costs to use 8 common investing apps

Investment type: ETFs

Fees: 0.25% annual fee for Digital accounts; 0.40% annual fee for Premium accounts

Expense ratio: Varies by portfolio; average is 0.13%

Minimums: No minimum amount to open a Digital account; $100,000 minimum for Premium account

Investment type: Real estate

Fees: 1.5% annual fee

Transaction fee: 1%

Minimums: $100,000 per transaction

Investment type: Startup companies

Fees: Free for investors; companies pay fees

Expense ratio: N/A

Minimums: Set by companies you invest in, typically between $10,000 and $50,000

Investment type: ETFs

Fees: 0.25% annual fee; 0.50% fee for premium

Expense ratio: Varies, between 0.06% to 0.16%

Minimums: No minimum for Digital account; $50,000 for Premium account

Investment type: Real estate

Fees: 1% per year (0.85% annual asset management fee and and 0.15% annual investment advisory fee)

Upfront costs: 0%-2%, depending on the investment

Minimums: $500 for starter portfolio, $1,000 for advanced portfolio

Investment type: Alternative investments (including private equity and hedge funds)

Fees: No fee to access site; fees dependent on investment

Expense ratio: Based on investment

Minimums: $100,000 per fund

Investment type: Stocks and ETFs

Fees: No fees to use the app; Robinhood Gold starts at $6 a month

Expense ratio: Depends on the investment you choose (ETF industry average was 0.57% in 2016)

Minimums: No minimum for standard; $2,000 for Robinhood Gold