Reviewed by Harsh Desai · Last reviewed:
Stellar
An AI voice agent that answers every call and books appointments automatically
Best for
What does Stellar do?
- •10-minute setup launch your first AI agent in about 10 minutes using preloaded knowledge bases.
- •16 industry templates choose from verticals like HVAC, plumbing, dental, electrical, roofing, med spas and real estate.
- •Google Calendar sync book appointments directly into Google Calendar or Cal.com without manual entry.
- •HubSpot and CRM links enrich calls with data from HubSpot, ServiceTitan, GoHighLevel and Google Sheets.
- •Self-learning agents agents improve over time and adapt using built-in learning from every conversation.
- •Call quality scoring review every call with automatic scoring and QA trend reports each week.
- •Speed-to-lead dashboard track response times and performance with real-time dashboards and alerts.
- •Inbound and outbound calls run both types of calls plus multi-agent pipelines for complex workflows.
- •Weekly AI digest emails receive summaries and insights delivered automatically to your inbox every week.
- •Recording retention store call recordings that scale with your chosen plan and usage level.
- •Vertical-specific knowledge agents sound like senior employees from day one in your exact industry.
- •Multi-Agent Pipelines Orchestrate sophisticated workflows with 3 specialized AI agents handling qualification, booking, and follow-up smoothly.
- •Pre-Call CRM Enrichment Automatically pulls and analyzes prospect data from 8 integrated platforms before answering every inbound call.
- •QA Trends Analysis Delivers actionable insights from 100% of calls with visual trend reports identifying coaching opportunities across teams.
- •14-Day Free Trial Launch your no-code voice agent risk-free with full features and no credit card needed to start booking appointments immediately.
Pricing:
- •Growth $149/mo 200 minutes, 3 agents, 3 knowledge bases and core features with 14-day trial.
- •Pro $399/mo 750 minutes, 8 agents, 5 knowledge bases plus advanced dashboards and Slack alerts.
- •Scale $899/mo 3000 minutes, 20 agents, unlimited knowledge bases and full pipeline tools.
- •Agency $999/mo 3000 pooled minutes, unlimited sub-accounts for managing client voice agents.
What are Stellar's limitations?
- •Capped minutes every plan limits talk time with overage fees of $0.18 to $0.10 per minute.
- •Tiered advanced features unlimited pipelines, regression testing and deep QA only on higher plans.
- •30-day retention entry recording retention is limited to 30 days on the Growth plan.
- •Custom knowledge iteration highly custom knowledge bases may require several rounds of testing.
Our Verdict
For the Basic User, Stellar delivers a straightforward no-code solution for 24/7 call answering and appointment booking that removes the need for complex scripting or developer help. Small businesses can quickly deploy voice agents that handle inbound calls, qualify leads, and sync bookings directly into calendars without technical headaches. The entry-level Growth plan at $149 per month provides 200 minutes, three agents, and three knowledge bases, making it accessible for solo operators or startups testing automated phone support. Annual billing offers up to 20 percent savings while overage rates start at $0.18 per minute, allowing controlled scaling as call volume grows.
For the Vibe Builder, Stellar shines by letting creative professionals craft personalized conversational flows that reflect unique brand voice and customer experience goals. Its intuitive interface supports custom knowledge base tuning and personality adjustments so each agent feels authentic rather than robotic, helping agencies and consultants stand out through memorable phone interactions. Higher tiers open up unlimited pipelines and advanced QA tools that let vibe-focused users iterate on tone, pacing, and emotional intelligence without coding. This makes Stellar a compelling choice for those who prioritize distinctive customer journeys over pure technical depth.
Stellar has some honest limitations that may impact power users or enterprises needing extensive customization. Minutes are strictly capped per plan with overage fees applying, while advanced QA, regression testing, and unlimited pipelines appear only on higher tiers. Recording retention is limited to 30 days on the entry plan and setup of highly custom knowledge bases may require several rounds of iteration. Overall it earns a 7.6/10 for balancing ease and capability but falls short of fully flexible platforms in complex scenarios.
Skip it if you need unlimited recording history or enterprise-grade testing tools and consider Vapi instead.
Related Tools
View all
Compare Stellar With
Also Useful For
Frequently Asked Questions
What is Stellar AI voice agent?
Stellar is an AI voice agent platform that lets businesses build and deploy natural-sounding conversational agents for customer support, sales calls, and appointment booking. It combines real-time voice AI with customizable knowledge bases so the agents can handle complex interactions without sounding robotic. Users can scale from simple inbound calls to full outbound campaigns through its dashboard.
How much does Stellar cost in 2026?
Stellar costs $149, $399, $899 or $999 per month depending on which plan fits your usage. The Growth plan is $149, Pro is $399, Scale runs $899, and the Agency tier is $999. Check the current pricing page since rates can change.
Who should use Stellar for their business?
Small to medium businesses that handle high call volumes or want to automate lead qualification should use Stellar for their business. It works especially well for support teams, sales development reps, and agencies managing multiple client voice agents. Companies needing 24/7 availability without hiring extra staff get the most value from it.
What is the difference between Stellar and Vapi?
Stellar and Vapi both build voice agents but Stellar focuses more on built-in knowledge bases, advanced analytics, and multi-agent workflows while Vapi emphasizes raw API flexibility. Stellar gives you ready-to-use dashboards and Slack alerts out of the box whereas Vapi often requires more custom development. The choice usually comes down to whether you want faster setup with Stellar or deeper code-level control with Vapi.
Does Stellar have a free plan or trial as an alternative?
Stellar does not have a free tier but it offers a 14-day trial on the Growth plan so you can test it risk-free. During the trial you get 200 minutes, 3 agents, and 3 knowledge bases to evaluate the core features. This gives most teams enough time to run real calls before committing.
Affiliate link: we may earn a commission. How this works.
Stellar
From $149/mo