CapTrader vs Interactive Brokers — which broker is better?

Pros

• BaFin-supervised German investment firm (institution number 10156708) with a Düsseldorf address, German contract law and a free German hotline until 20:00
• Eurex options and futures at EUR 2.00 per contract, Mini-DAX futures at EUR 1.00 and CME Micro E-minis at USD 1.25 — competitive with anything available to German retail traders
• Access to over 160 market destinations, more than 1.2 million instruments, one million-plus bonds and 37,000 funds from a single multi-currency account
• No account fee, no custody fee, no inactivity fee, and free real accounts on TWS, CapTrader Desktop, AgenaTrader Andromeda and the TraderFox Trading-Desk
• German shares on Tradegate, gettex, Chi-X and Turquoise DE from a EUR 2.00 minimum — noticeably cheaper than the EUR 4.00 Xetra minimum for small orders
• Trustpilot rating of 4.9 from more than 800 reviews, with support consistently named as the reason
• Interactive Brokers' execution stack underneath: SmartRouting, real-time margining, more than 60 order types and a mature API

Cons

• No Abgeltungsteuer is withheld. German investors gain a compounding advantage but must declare everything themselves via Anlage KAP, and a Freistellungsauftrag is not possible — for many people that alone rules CapTrader out
• Commissions are a visible markup on Interactive Brokers' own schedule: 0.10% with a EUR 4.00 Xetra minimum against IBKR's 0.05% and EUR 1.25, and USD 0.01 per share against IBKR's USD 0.0035
• Currency conversion costs 0.3 basis points with a EUR 3.75 minimum — one and a half times what IBKR charges direct, and the minimum bites on every small conversion
• Investor compensation for EEA clients is the Irish scheme's 90% of EUR 20,000, thin against the German EUR 100,000 deposit guarantee investors are used to
• EUR 2,000 minimum deposit and per-order minimums make small, regular ETF purchases uneconomic; there are no free savings plans
• No spot crypto — only Bitcoin futures and exchange-traded products — and real-time market data is a paid monthly subscription per exchange

Pros

• US stocks from USD 0.0035 per share on the Tiered plan, minimum USD 0.35 per order and capped at 1% of trade value
• Currency conversion at 0.20 basis points (minimum USD 2) — an order of magnitude cheaper than most European brokers' 0.25%–1.5%
• Roughly 160 market destinations in 36 countries from a single multi-currency account, with 28 settlement currencies
• No inactivity fee since 2021, plus no custody fee and no platform fee
• Trader Workstation offers over 100 order types plus a mature Python/Java/REST API used widely by retail algo traders
• Nasdaq-listed parent (IBKR) with published quarterly financials and around USD 21 billion of equity capital
• Top-tier licences in the US, UK, Ireland, Australia, Singapore and Hong Kong, with per-entity investor compensation disclosed
• Paper trading account mirrors the live platform, including the full API

Cons

• Customer support is the most common complaint: many requests go through the ticket system, and public reviews (e.g. on Trustpilot) often cite slow replies and template answers
• Trader Workstation has a genuinely steep learning curve; the first session is intimidating even for experienced traders
• The fee schedule is complicated: Fixed versus Tiered, pass-through exchange fees, and per-exchange minimums make cost prediction harder than it should be
• Real-time market data is a paid subscription per exchange, so the headline commissions understate the true monthly cost for active traders
• Account opening is longer and more document-heavy than at app-first brokers, and the website navigation is poor
• Spot crypto is only available to US clients via a separate arrangement; EEA clients get futures and exchange-traded products instead