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<a href="https://shouldiuse.io/vs/cryptotaxcalculator/koinly">CryptoTaxCalculator (now Summ) vs Koinly on Should I Use It</a>

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CryptoTaxCalculator (now Summ) versus Koinly
Compare	CryptoTaxCalculator (now Summ)	Koinly
Verdict	Depends	Depends
Best for	Active multi-exchange crypto traders	Active multi-exchange traders
Who it's not for	Buy-and-holders with a handful of trades	Buy-and-holders using one exchange
Privacy	No known public vulnerabilities found in the sources reviewed.¹²	ISO 27001-compliant per Koinly's own materials; one source references an unverified data breach.
Support quality	Official account actively answers users on Reddit.	No reliable evidence in reviewed sources
Public sentiment	Users say it simplifies messy multi-exchange crypto taxes but report cost surprises, import errors, and frequent Koinly comparisons.	Long-term users report reliable tracking, but plan confusion and API-key security concerns recur across reviews.¹⁴
Biggest gotcha	Users report historic imports inflating balances . audit every import before filing.^⁸	API-key access means breach exposure sits with the vendor; one source cites a Koinly data breach

Pick CryptoTaxCalculator (now Summ) when

Active multi-exchange crypto traders
DeFi and NFT-heavy portfolios
Accountants filing client crypto returns
Users in AU, US, and India

When CryptoTaxCalculator (now Summ) is not a fit

Buy-and-holders with a handful of trades
One-exchange, low-volume users . a spreadsheet suffices
Buyers needing certified security before connecting exchange APIs
Anyone unwilling to hit a paywall at filing time

Pick Koinly when

Active multi-exchange traders
DeFi and multi-chain users
Accountants handling client crypto
Multi-year portfolio histories

When Koinly is not a fit

Buy-and-holders using one exchange
A few dozen transactions . spreadsheet works
Enterprises needing full accounting ledgers
Anyone refusing third-party API key access

Sources

G2: Cryptotaxcalculator Reviews & Product Detailsg2.com
review
Trustpilot: Summ (formerly Crypto Tax Calculator)trustpilot.com
review
Finder: Summ Review (Formerly CryptoTaxCalculator)finder.com
review
BitDegree: Summ Review 2026bitdegree.org
review
Awaken: CryptoTaxCalculator Reviewawaken.tax
review
Capterra: CryptoTaxCalculator Pricing & Reviewscapterra.com
review
Reddit r/Swyftx: How much does it cost?reddit.com
review
Reddit r/CryptoTax: historic import balance issuereddit.com
review
Dealroom: CryptoTaxCalculator Secures $4Mapp.dealroom.co
news
Airtree Ventures investment noteairtree.vc
news
Summ official India tax rules pagesumm.com
official
CryptoTaxCalculator security pagecryptotaxcalculator.io
security
Koinly: CTC vs Bitcoin.Tax comparisonkoinly.io
review
Koinly Trustpilot reviewstrustpilot.com
review
How reliable is Koinly? . Redditreddit.com
review
Best Crypto Tax Software 2026 . CalcMoneycalcmoney.io
review