21bitcoin.app

What It Is

21bitcoin is a Bitcoin-only platform from Austria, operated by FIOR Digital GmbH. It focuses on making it convenient, secure, and regulated for users in Europe to buy, sell, and store Bitcoin. The platform explicitly avoids memecoins, altcoins, and complex crypto products, instead building around BTC with an app, recurring buys, limit orders, custody, educational content, and personal support. Its website says it has 100,000+ users in Europe, a 4.8 Trustpilot rating, and strong app store ratings.

Core Capabilities, Security, and Compliance

The platform is closer to a “Bitcoin broker / investment and custody app” than a full-service exchange. The only disclosed supported asset is BTC, making it suitable for users who only want Bitcoin exposure. On the fiat side, EUR is the core currency: users can buy with an in-app EUR balance, or set up savings plans via SEPA standing order. 21bitcoin also works with Germany’s VR Bank Bayern Mitte. For security, user BTC is held by BitGo Custody as the technical custody partner. The platform says assets are held 1:1 and not lent out, and that BitGo has over $250 million in cold-storage insurance coverage. On compliance, the website states that the company is based in Austria, has obtained FMA VASP registration, and in 2025 became one of the earlier Bitcoin companies to receive a MiCAR CASP license.

Fees and Products

A key fee highlight is Auto-Invest: for daily recurring purchases, standard buy fees apply for the first 7 active days, then drop to 0%; for weekly, biweekly, or monthly plans, the first execution is charged, and subsequent ones are 0%. Deposits are said to be free, with limits up to €100,000. The downside is that the main site does not disclose specific rates for regular instant buys, sells, withdrawals, or spreads, so the real total cost still needs to be confirmed inside the app. The platform also offers limit orders, account statements, tax reports, referral rewards, as well as 21Private for clients starting from €100,000 and 21business for companies.

Pros, Cons, and Who It’s For

The strengths are a clear positioning, a strong regulatory narrative, relatively transparent custody and insurance information, and a fee structure that is friendly to long-term recurring-buy users. Educational content and 24/7 support also lower the barrier for beginners. The drawbacks are equally clear: it only supports BTC, so it is not suitable for multi-asset trading, DeFi, futures, or leverage users; regular fee details are not publicly detailed; and phone/video support is mainly aimed at high-net-worth clients.

China Access and Alternatives

The site does not state whether it is accessible from mainland China, which account-opening regions are supported, whether RMB payments are available, or whether Chinese residents can use the service, so China access is rated as “unknown.” Judging by the product design, it primarily serves European users and relies on EUR and SEPA. Even if users in China can access the website, they may face restrictions around identity verification and fiat deposits. For multi-asset support or a Chinese-language ecosystem, alternatives to compare include Coinbase, Kraken, Bitpanda, and Binance. For Bitcoin-only recurring investment, similar services such as Swan Bitcoin and Relai may also be worth considering.