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Yes, both Zervant and Slack offer a Free Trial.
Zervant is designed for Medium Business and Small Business.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of Slack begins at $2.67/Month, while pricing details for Zervant are unavailable.
Some top alternatives to Zervant includes Invoice Ninja, Invoiced, Zoho Invoice, InvoiceBerry, Invoicely, Moon Invoice, Invoicebus, Simple Invoices, Billin and Invoice Simple.
Some top alternatives to Slack includes Microsoft Teams, Glip, Google Chat, ChatWork, Dialog, Office Chat, imBee, Takle, SPACE Channel and Teamwork Chat.
