Revolut makes the list. Revolut LONDON — 2017 has been another solid year for crowdfunding.

Seedrs, one of the UK's biggest crowdfunding platforms, surpassed £300 million invested across the platform since its launch and the total invested through crowdfunding surpassed 2016's total.

That's according to Off3r, a comparison site that lets retail investors compare investment options. Off3r calculates that British startups raised £229 million through crowdfunding this year, around £12 million more than in 2016.

Off3r has rounded up a list of the top 20 crowdfunding campaigns of the year, covering everything from digital banking to healthcare.

Here are the companies that crowdfunded the most this year: