Klient PSA vs Sierra Comparison

Why choose Klient PSA

• Higher Cost score (5/10 vs 2/10)
• Better fit for mid-market (8/10 vs 5/10)
• Better fit for small business (3/10 vs 1/10)

Why choose Sierra

• Higher Scalability score (9/10 vs 7/10)
• Higher Integration score (8/10 vs 7/10)
• Better fit for enterprise (10/10 vs 6/10)

Klient PSA

Pros

• It runs natively in Salesforce, so project, resource and billing data sit next to CRM opportunities and use the existing Salesforce permissions.
• Reviewers say time tracking, project profitability and forecasting work well together in one system.
• The base edition includes the Salesforce Platform license and connectors for QuickBooks, Xero and AccountingSeed.
• Klient lists SOC 2 Type 2 compliance, and its agents inherit Salesforce's Einstein Trust Layer.
• Enterprise includes a branded client portal with approvals and five community users per internal user.

Cons

• It only makes sense for firms already on Salesforce.
• Reviewers mention a steep learning curve and thin documentation.
• Some users call the project management weaker than in dedicated PM tools, and one finds revenue recognition weaker than competitors'.
• Jira Sync, the Sage Intacct connector, AI agents and guided onboarding are all extra costs, and guided onboarding can reach $18,000.
• Reviewers say there is no customizable PDF generation for proposals.

Sierra

Pros

• Outcome-based billing means customers usually pay only for resolved conversations or other agreed results, not for each seat.
• Three build options cover both CX teams and engineers: the no-code Agent Studio, the code-first Agent SDK, and Ghostwriter for building agents from SOPs.
• One agent runs across chat, voice, SMS, WhatsApp, email and ChatGPT, keeping context between channels.
• Its list of compliance attestations is broad, covering SOC 2, ISO 27001, ISO 42001, HIPAA, PCI DSS and FedRAMP.
• It has a strong roster of enterprise customers, including SiriusXM, ADT, Rocket Mortgage and SoFi.

Cons

• There is no public pricing, and competitor estimates put annual contracts at about $150,000 or more.
• There is no self-serve or trial tier, so small teams cannot try it on their own.
• Implementation is largely vendor-led, which can make customers depend on Sierra's team for changes.
• There are few public reviews (7 on Gartner Peer Insights) to verify claims against.
• Some reviewers say voice quality still falls short of human level, and that complex telephony setups depend on how far the integration goes.