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We've compiled a list of 5 free and paid alternatives to Sidekick. The primary competitors include Followup.cc, MailTag. In addition to these, users also draw comparisons between Sidekick and Mailcastr, Remail.io, Vocus.io. Also you can look at other similar options here: Business and Commerce Tools.


MailTag is your all-in-one free Chrome extension for email tracking, scheduling, and auto follow-up.

Mailcastr is an email tracker app for Gmail and Inbox which shows when your email is opened/read by...

Sidekick is a sales and marketing tool that tracks email opens, link clicks, and engagement. It helps users monitor communication in real-time, improving outreach and follow-up efficiency. Sidekick integrates with email platforms to boost sales productivity and customer insights.

Sidekick Platforms

Web-Based Web-Based

Sidekick Overview

Sidekick by HubSpot is a streamlined sales intelligence tool built to integrate directly with HubSpot CRM and messaging platforms like Slack and Microsoft Teams. It enables real‑time email and document tracking, notifying sales reps instantly when a prospect opens an email, clicks a link, or views an attachment. Users can automate follow‑ups, schedule emails to optimize engagement, and deploy pre‑built templates and sequences to maintain consistent outreach. The tool also supports call logging, meeting insights, and contact profiling within the CRM, enriching lead data with history, social context, and behavior analytics. Designed for efficiency, Sidekick removes the need to switch platforms by allowing users to update CRM properties, enroll leads in sequences, and view meeting notes from Slack or Teams channels.

The primary advantages of Sidekick lie in boosted sales productivity, enhanced insight, and seamless workflow integration. Sales professionals gain visibility into prospect behavior-knowing the precise moment a lead engages with content-allowing for timely, personalized engagement. By automating repetitive tasks like follow‑ups and template distribution, users reclaim time for relationship building and deal closure. Integrations across email, CRM, and messaging reduce friction and ensure data consistency without manual entry. With centralized analytics and actionable alerts, teams can prioritize high‑intent leads, measure sequence effectiveness, and refine outreach strategies dynamically.

Top Sidekick Alternatives

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Sidekick Categories

Business and Commerce Tools

Sidekick Tags

sales email-marketing gmail

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