A newer object-oriented personal-knowledge-management app where every note is a typed object (book, person, idea) with backlinks — the free plan gives unlimited objects, unlimited pages, daily notes, and AI features with a 100 MB file-storage cap for 1 user. Pro from ~€7/mo unlocks unlimited storage, queries, advanced AI, and unlimited object references.
Visit site ↗A sales-engagement + scheduling layer for Gmail. Free forever for one user with unlimited email tracking, open/link/click notifications, templates, and calendar scheduling; sequences and automation are paid after a 7-day trial. Growth from ~$9/seat/mo adds sequences, mail merge, and integrations.
Visit site ↗The scheduling default most people recognize. Free forever for one user with one event type, unlimited one-to-one meetings, and Calendly branding on the booking page; group events, round-robin, and routing forms are paid. Standard from ~$10/seat/mo adds unlimited event types, group meetings, and removes branding.
Visit site ↗The all-in-one blocks-and-database workspace most people recognize — the Free plan gives unlimited blocks and pages for personal workspaces, 10 guest collaborators, unlimited sync across iOS/Android/desktop, 5 MB file uploads, and 7-day page history. The old 1,000-block cap was removed for the Free plan. Plus from ~$10/seat/mo adds unlimited file uploads, 30-day history, and unlimited team members.
Visit site ↗A polished scheduling tool with calendar overlays for picking times collaboratively. Free forever for one solo user with one calendar connection, unlimited 1:1 meetings, and SavvyCal branding; group events and routing are paid. Editor from ~$12/mo adds multiple calendars, group scheduling, and removes branding.
Visit site ↗The most recognized email-marketing + marketing-automation name and the only one of the four with a real forever-free tier for email automation. Free forever for 500 contacts and 1,000 emails/month (10,000 lifetime email sends) with Mailchimp branding, a basic audience, email templates, a drag-and-drop builder, and 1-step basic automation (welcome email, tag-based). Standard from ~$13/mo for 500 contacts adds multi-step automations, A/B testing, and 24/7 support; Essentials from ~$6/mo for 500 contacts adds email scheduling + basic A/B testing.
Visit site ↗The hosted all-in-one ecommerce platform and the de-facto default for merchants who want everything managed. No forever-free tier — a 3-day free trial (often extended to a $1/month for the first month promotion), then paid Basic from ~$39/mo for unlimited products, 2 staff accounts, standard reports, and a custom domain. Huge app store and themes; Shopify Payments avoids extra transaction fees.
Visit site ↗A hosted SaaS ecommerce platform aimed at growing and enterprise merchants. No forever-free tier — a 15-day free trial, then paid Standard from ~$39/mo for unlimited products, bandwidth, and storage with no transaction fees on its native payment gateway. Strong built-in SEO, B2B selling, and multi-channel sales (Amazon, eBay, Google, social).
Visit site ↗A marketing-automation and email-marketing platform best known for its visual workflow automation builder (site tracking, event tracking, lead scoring, conditional content, split automations). No forever-free tier — a 14-day free trial, then Starter from ~$15/mo for 1,000 contacts with unlimited emails, automation, landing pages, and forms; higher tiers add predictive sending, split actions, and custom objects. The deepest automation workflows of the four.
Visit site ↗A data-driven email + SMS marketing-automation platform built for ecommerce (deep Shopify/Magento/WooCommerce integration, predictive analytics, CDP-style customer profiles, flows for abandoned-cart, welcome, browse-abandonment, win-back). Free forever for up to 250 contacts and 500 email sends/month with all core email features (flows, segmentation, A/B testing, predictive analytics); SMS available with a small monthly credit. Paid Email from ~$45/mo for 500 contacts unlocks more sends + SMS & email combined. The ecommerce-marketing automation specialist.
Visit site ↗