Summ looks promising on the surface, but the platform simply does not work reliably with Coinbase or Coinbase Advanced Trade. The import process loses critical data, drops transactions, and mis‑categorizes trades in ways that create fake gains and missing cost basis. Once this happens, you’re forced into hours of manual reconstruction for transactions that should have been recognized automatically.Support repeatedly promises fixes, but the issues never actually get resolved. You keep trying the suggested steps, re‑syncing, re‑uploading, and waiting for updates — but the underlying problems remain unchanged.To make matters worse, Summ’s 7‑day refund window is completely inadequate. You don’t discover the full extent of the import and categorization failures until you’ve spent significant time troubleshooting. By the time it becomes clear the service won’t work for your data, the refund period has already expired.Support response times are also slow, often taking 3–4 days between replies. That delay contributes directly to users missing the refund window while waiting for help that ultimately doesn’t fix the problem.For a tax product, accuracy and reliability are non‑negotiable. Until Summ fixes Coinbase importing, improves categorization, and offers a realistic refund policy, it’s not a dependable solution for anyone who trades on Coinbase.Date of experience: February 2026
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