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Calendly, Acuity Scheduling (by Squarespace), Setmore, Square Appointments, and Cal.com stand out as the top appointment scheduling tools that people and businesses actually use most widely, based on user volume, review sites (G2, Capterra), expert roundups (Zapier, Forbes Advisor, etc.), and real-world mentions.

These tools handle online booking pages, calendar syncing (Google, Outlook, etc.), reminders, payments, team scheduling, and integrations. Choice depends on needs: simple 1:1 meetings vs. service-based businesses (salons, coaching, healthcare) with payments/packages, free/budget options, or advanced customization.

1. Calendly (Most Popular Overall)

Calendly is the clear market leader with 20+ million users across 230+ countries and adoption by 86% of Fortune 500 companies. It dominates for professionals, sales teams, consultants, recruiters, and freelancers.

• Best for: Easy meeting scheduling, round-robin/team routing, sales demos, and virtual appointments.
• Key strengths: Extremely simple setup and interface; strong calendar sync and timezone handling; automated workflows, reminders (email/SMS), and follow-ups; excellent integrations (Zoom, Google Meet, CRMs like Salesforce/HubSpot, Stripe/PayPal for payments); embeddable booking pages and browser extensions.
• Limitations: Less specialized for complex multi-service businesses with packages, memberships, or heavy in-person client management compared to Acuity.
• Pricing: Free plan (limited event types/calendars); Standard ~$10/user/month (annual); Teams ~$16/user/month (annual); Enterprise custom (starts ~$15k/year).
• Why people use it: Reliability, ubiquity (everyone knows the Calendly link), and time-saving automation. It frequently tops “best of” lists for small businesses and teams.

2. Acuity Scheduling (by Squarespace)

Highly popular for service businesses, with over 15 million appointments booked monthly and strong market share (~100k+ companies tracked in some analyses).

• Best for: Coaches, therapists, salons/spas, photographers, consultants, and any business needing payments, packages, gift cards, memberships, intake forms, and client management.
• Key strengths: Robust appointment features (add-ons, recurring, “look busy” to hide slots); built-in payments (Stripe/Square/PayPal); strong customization and branding; SMS/email reminders; good mobile apps; Squarespace integration; HIPAA options on higher plans.
• Limitations: No permanent free plan (7-day trial); can feel more complex than Calendly for pure meeting use; pricing scales with calendars/staff.
• Pricing: Starts around $16–20/month (Starter/Emerging for 1 calendar, annual billing cheaper); Standard ~$27–34/month (more calendars, SMS, packages); Premium ~$49–61/month (more staff, advanced features, branding removal).
• Why people use it: It goes beyond basic booking into full business tools for appointment-based services. Frequently recommended in Zapier and other expert reviews for ease + power.

3. Setmore

A go-to affordable/free option with strong user love, solid app ratings (e.g., ~4.7 on Apple with thousands of reviews), and frequent praise for small businesses.

• Best for: Small teams, solopreneurs, and budget-conscious businesses wanting solid free features.
• Key strengths: Generous free plan; customizable branded booking pages; payments; email/SMS reminders; mobile apps (iOS/Android) with POS-like features; integrations (Google Calendar, Zoom, Stripe/Square, social media); easy website/Facebook/Instagram embedding.
• Limitations: Some advanced features (full calendar sync, unlimited) require paid; fewer enterprise-level tools.
• Pricing: Free (up to 4 users, ~200 appointments, payments, basic features); Pro plans from ~$5/user/month (unlimited, more branding/SMS, etc.).
• Why people use it: Excellent value and quick setup. Often called out as a top free or low-cost pick.

4. Square Appointments

Popular among local/service businesses already in (or wanting) the Square ecosystem for payments and POS.

• Best for: Retail, salons, fitness, home services, or anyone needing seamless payments + in-person tools.
• Key strengths: Free tier for solos; excellent mobile app; built-in POS and payments; staff management; online booking site; real-time sync.
• Pricing: Free for single location/basic; paid plans start higher for multi-location/advanced (~$29–49+/month range in reviews).
• Why people use it: Tight integration with Square’s payment/hardware tools reduces friction. Appears regularly in top lists.

5. Cal.com (Strong Rising Alternative)

Open-source platform with over a million users; growing fast as a modern, flexible Calendly alternative, especially among tech-savvy users.

• Best for: Developers, privacy-focused teams, self-hosting needs, or advanced customization/workflows.
• Key strengths: Highly customizable (open-source option); generous free plan; strong team/round-robin features; payments, workflows, and integrations; modern UI.
• Limitations: Support can vary; self-hosting requires technical know-how.
• Pricing: Free tier available; paid from ~$12–15/user/month.
• Why people use it: More flexible/powerful than Calendly for complex needs without as many restrictions; good for those avoiding proprietary lock-in.

Other Notable Options People Use

• SimplyBook.me: Feature-rich (customization, many payment gateways, 30+ languages); good free tier (limited bookings); strong for international or complex setups. Often in top 5 lists.
• YouCanBook.me: Solid free option with templates; simple and effective for basic needs.
• Zoho Bookings: Excellent if you’re in the Zoho ecosystem; affordable and integrated.
• Built-in free/cheap: Google Calendar appointment scheduling (simple, great if you live in Google Workspace) and Microsoft Bookings (included with many Microsoft 365 plans).
• Niche leaders: Fresha or Vagaro/GlossGenius (beauty/wellness); SimplePractice or specialized tools (therapy/healthcare, often HIPAA-focused).

Quick Comparison & Recommendations

How to choose:

• Just need simple booking links for meetings? → Start with Calendly (or free Google/Microsoft).
• Service business taking payments/packages? → Acuity or Setmore/Square.
• Tight budget or testing? → Setmore free or Cal.com/YouCanBook.me.
• Team/enterprise features or self-host? → Calendly Teams or Cal.com.
• Test 2–3 with free trials/plans—focus on ease for your clients, calendar sync reliability, payment needs, and integrations with your existing tools (CRM, video, email).

Most of these offer website embeds, social booking buttons, and mobile access. Check current pricing/features directly, as they evolve, and look at recent G2/Capterra reviews for your industry. Real users prioritize reducing no-shows via reminders and making booking frictionless.

Top appointment scheduling software includes Calendly, Acuity Scheduling, Square Appointments, Cal.com, and Setmore, each tailored for specific user needs ranging from teams to solo providers and service-based businesses +2 .

Leading Options

1. Calendly – Best for Teams and Enterprise Use Calendly is highly popular among businesses needing efficient team scheduling. It supports round-robin and collective scheduling, integrates seamlessly with Salesforce, HubSpot, Zoom, and calendar platforms, and provides polished client-facing booking experiences +1 .

Key Strengths: Team event scheduling, CRM integrations, lead qualification forms, enterprise security Pricing: Free (1 event type), Standard $10/seat/mo, Teams $16/seat/mo

2. Acuity Scheduling – Best for Service-Based Businesses Designed for salons, fitness studios, coaches, and healthcare providers, Acuity offers intake forms, class booking, multi-location management, and payment collection via Stripe, Square, or PayPal . HIPAA compliance is available for medical users.

Key Strengths: Payment collection, class/workshop scheduling, customizable intake forms, multi-staff management Pricing: Emerging $16/mo, Growing $27/mo, Powerhouse $49/mo

3. Square Appointments – Best Free Option for Solo Providers Ideal for single-user businesses like freelancers or personal trainers, Square Appointments provides free scheduling, payment processing, and no-show protection. It integrates with Instagram and Google for bookings .

Key Strengths: Free for one user, integrated POS, automated reminders Pricing: Free (1 user), Plus $29/mo/location, Premium $69/mo/location

4. Cal.com – Best Open-Source / Developer-Friendly Option Cal.com allows self-hosting, full API access, and detailed customization, suitable for privacy-conscious teams or developers creating integrated booking solutions .

Key Strengths: Open-source, self-hostable, API-first Pricing: Free tier for individuals; paid $15/user/mo

5. Setmore – Great Free Option for Small Teams Supports up to four staff profiles, built-in video meetings, social media booking buttons, and payment integration via Stripe and Square .

Key Strengths: Free multi-user support, video conferencing, easy calendar sync Pricing: Free (up to 4 staff), Pro $5/user/mo

Other Notable Options

SimplyBook.me: Highly customizable with 70+ plugins for memberships, packages, and HIPAA-compliant scheduling 1 . YouCanBookMe: Minimalistic, fast setup, integrates with Google/Outlook calendars for simple scheduling 1 . Google Calendar Appointment Slots: Best for users already in Google Workspace, integrates natively and supports basic payment collection 1 . 10to8: Reduces no-shows using multi-channel reminders, suitable for SMBs 1 . HubSpot Meetings: Integrated with the CRM, ideal for sales and marketing teams 1 .

Choosing the Right Tool

For teams needing CRM and workflow integration: Calendly or HubSpot Meetings. For service-based businesses collecting payments: Acuity Scheduling or SimplyBook.me. For solo providers seeking free ease-of-use: Square Appointments or Setmore. For developers or privacy-focused setups: Cal.com. For users already using Google Workspace: Google Calendar scheduling slots.

Each of these platforms is evaluated on ease of setup, automation, calendar integration, reminders, payment options, and scalability, making them effective tools for modern appointment management +2 .