Sierra vs Certainly
Comprehensive side-by-side comparison — features, pricing, performance, and more.
Updated May 2026
Trust & Reliability
Sierra
Customers (per vendor):Rocket Mortgage, Gap Inc., SoFi +7
GDPR
SOC 2
HIPAA
Too Close to Call
Sierra (6.7) vs Certainly (6.3) — difference of 0.3 points
AI Comparison Summary
Sierra
6.7
avg score
Certainly
6.3
avg score
Sierra leads overall — particularly in Value for Money.
Based on 6 dimensions
How scores are calculatedOverall Winner
Sierra
6.7 / 10
Sierra
Best For
Large enterprises seeking to automate customer support
Companies aiming for personalized, multi-channel customer experiences
Businesses needing robust AI agent development and management tools
Organizations focused on continuous improvement of AI agent performance
Not Ideal For
Small businesses or startups with limited budgets for enterprise solutions
Individuals seeking a simple, off-the-shelf chatbot solution for personal use
Companies without existing customer data infrastructure to integrate
Certainly
Best For
Automating multi-step research workflows for analysts
Resolving customer support tickets instantly for large brands
Boosting e-commerce conversion rates with AI shopping assistants
Creating hyper-personalized marketing journeys for customer segments
Not Ideal For
Small businesses or individuals seeking self-service AI agent solutions
Users looking for transparent, fixed-price subscription models without sales engagement
Companies that prefer to build and manage their own AI agents from scratch without external expertise
* Verdict is based on our algorithmic scoring of publicly available data. Learn about our methodology
Sierra is best for
🤖Automation & Agents10.0🎧Customer Support8.4💬Chat & Conversation8.0
Certainly is best for
🤖Automation & Agents8.0🎧Customer Support7.8🔍Research7.0
Filter by your use case:
Pros & Cons
SierraPros
- Delivers personalized and empathetic customer experiences at scale
- Supports a wide range of communication channels including voice
- Offers both no-code (Agent Studio) and code-based (Agent SDK) development options
- Provides robust analytics, experimentation, and observability for continuous improvement
- Ensures brand adherence and minimizes hallucinations through supervisory agents
- Integrates with existing customer data and systems of record
- Strong commitment to security and compliance (SOC 2, ISO 27001, HIPAA, GDPR)
- Outcome-based pricing model aligns cost with value delivered
Cons
- Primarily designed for large enterprises, potentially cost-prohibitive for smaller businesses
- Requires significant integration effort with existing enterprise systems
- Complexity of managing multiple supervisory agents and guardrails
- No transparent public pricing available, requiring direct contact for quotes
CertainlyPros
- Handles routine inquiries 24/7 with accurate, multilingual responses
- Continuously monitors performance and optimizes AI agents based on real interactions
- Provides seamless customer engagement across chat, email, social media, and QR codes
- Guarantees customer data is never used for AI/ML model training, ensuring privacy
- Offers dedicated onboarding and AI consulting services for comprehensive support
- Includes CRM-driven personalization for highly relevant customer interactions
Cons
- Pricing is enterprise-focused with no transparent, self-service tiers
- Requires contacting sales for all subscription plans, indicating a sales-led process
- All plans include annual conversation caps, with overage fees for exceeding limits
Weighted Score — Adjust What Matters to You
Pick a profile or drag sliders — scores and radar update instantly on the right.
Quick profiles:
Ease of Use5
Output Quality5
Value for Money5
Customizability5
Support & Ecosystem5
Integration Power5
Dimension Comparison
Sierra
6.7
/ 10
Your pick
Certainly
6.3
/ 10
Dimension Breakdown
Ease of Use
AIHow easy it is to get started and use daily
Sierra
6.0
Certainly
6.0
Output Quality
AIQuality and accuracy of generated results
Sierra
8.0
Certainly
8.0
Value for Money
AICost vs. features and output quality
Sierra
7.0▲ +2.0
Certainly
5.0
Customizability
CalculatedAbility to tailor to specific needs
Sierra
5.0
Certainly
6.0▲ +1.0
Support & Ecosystem
AIDocumentation, community, and support quality
Sierra
7.0
Certainly
7.0
Integration Power
CalculatedAbility to connect with other tools and workflows
Sierra
7.0▲ +1.0
Certainly
6.0
Calculated = derived from verified integration count and API/open-source signals. AI = LLM-assessed from public website content. Methodology
Task Performance
Sierra
Task
Certainly
8.08.0
Ticket Management
8.09.0
Auto Resolution
7.06.0
Knowledge Base
9.07.0
Live Chat
8.06.0
Sentiment Analysis
8.07.0
Escalation Rules
10.08.0
Multi Channel Support
7.07.0
Response Templates
7.06.0
Sla Tracking
8.07.0
Customer Satisfaction
* Task scores (1–10) are algorithmically generated from publicly available data.
Data is sourced from public information and vendor websites. It may not always be up-to-date — verify pricing and features directly with the vendor before purchasing.Report inaccuracy
Frequently Asked Questions
Which is better, Sierra or Certainly?
Both are strong options. Sierra has a rating of 0.0/5 (0 reviews), while Certainly has a rating of 0.0/5 (0 reviews). The best choice depends on your specific use case, budget, and workflow requirements.
Is Sierra cheaper than Certainly?
Sierra starts at free (enterprise model). Certainly starts at free (paid model). Use the Cost Calculator above for a detailed estimate.
What are the main differences between Sierra and Certainly?
Sierra — "Better customer experiences. Built on Sierra.". Certainly — "Create fans with a digital twin of your best agent, resolving tickets and driving loyalty.". Key differences include their pricing models, platform support, integrations, and technical capabilities. See the Feature Comparison table above for a complete side-by-side breakdown.