Estera vs Gemini Spark: Features, Pricing & Which Is Better (2026)

A side-by-side comparison of Estera and Gemini Spark — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.

Estera

Paid

An AI receptionist that answers phone calls and WhatsApp messages 24/7, qualifies leads, and books appointments in 50+ languages.

Inbound Voice Agent: Answers phone calls in under five seconds and handles reservations, questions, and busy-hour overflow.
WhatsApp Concierge: Replies to WhatsApp messages 24/7 using the business's own WhatsApp Business number.
Outbound Messages: Runs outbound WhatsApp campaigns for reminders, follow-ups, and re-engagement.
Calendar & CRM Booking: Writes appointments directly into the business's existing calendar, PMS, or CRM.
Business-specific Training: Trained on the business's services, prices, policies, and FAQs for on-brand responses.
50+ Languages: Speaks and replies in over fifty languages so international customers get help in their own language.
Fast Setup: Creates a working AI agent assistant in under three minutes with no engineering required.
Number Preservation: Uses your existing phone and WhatsApp Business numbers instead of forcing a switch.

Restaurant Reservations: Handle bookings, special requests, and busy-hour calls without staff on the phone.
Hotel Front Desk: Answer availability, amenities, and booking questions in guests' languages around the clock.
Dental & Medical Clinics: Book appointments and handle intake questions on WhatsApp and voice.
Real Estate Lead Qualification: Screen inbound inquiries about listings and route qualified leads to agents.
SMB Overflow Coverage: Catch after-hours and busy-hour calls that would otherwise go to voicemail.

Google

Paid

Google's always-on personal AI agent that monitors your inbox, manages your schedule, and completes multi-step tasks 24/7.

Always-On Operation: Runs continuously on Google Cloud and keeps working even when your laptop is closed.
Proactive Gmail Management: Organizes emails, drafts responses, prioritizes messages, and summarizes inbox activity.
Calendar & Scheduling: Manages appointments, suggests scheduling improvements, and prepares meeting summaries.
Google Workspace Integration: Connects natively with Gmail, Calendar, Drive, Docs, Sheets, Slides, YouTube, and Maps.
Third-Party Connections: Links to apps like Canva, OpenTable, and Instacart, with more partners coming.
Multi-Step Task Automation: Completes interconnected, recurring tasks such as spotting hidden fees or drafting reports from meeting notes.
User-Controlled & Opt-In: You decide whether to enable it and which apps it can access.

Inbox Triage: Automatically organize, prioritize, and draft replies to keep email under control.
Schedule Management: Keep a calendar organized with proactive appointment and meeting prep.
Recurring Monitoring: Set it to watch for things like hidden fees in monthly bills.
Report Generation: Turn meeting notes from chats and emails into polished Google Docs reports.