Hong Kong has no VAT or GST and a territorial profits tax regime, so the software categories that dominate elsewhere have little to sell here. What exists instead is company compliance as a service: Osome and Sleek both automate bookkeeping with machine learning, then have accountants produce profits-tax-ready financials and coordinate the audit that most Hong Kong companies require.
For professionals, the global research platforms are the serious option — Thomson Reuters offers ONESOURCE Corporate Income Tax and Checkpoint World for the Hong Kong market, and Wolters Kluwer's CCH has a long-standing Asia-Pacific tax research business. We list only companies with genuine Hong Kong coverage rather than padding the region with products that merely operate worldwide.