Free Online Booking System: 7 Tools Compared (2026)

Every booking tool has a free plan, and every free plan has a catch. Sometimes the catch is reasonable - a booking cap, a single calendar connection. Sometimes it's buried - a plan that silently expires unless you manually renew it every month, or "payments included" that turns out to mean you've used up your only feature slot.

This guide compares 7 booking systems that offer a genuinely free plan - not a 14-day trial dressed up as one. For each tool, we cover what the free tier actually includes, where the hard limits are, and what it costs when you outgrow it. Notably absent: Acuity Scheduling and Fresha, which have no free plan at all, and Doodle, which is a group-poll tool rather than a booking system.

One disclosure up front: Astrocal - the company behind this blog - is one of the tools compared. It's reviewed with the same framework as everything else, limits and all. All competitor details were verified at the time of writing but change frequently - check each tool's pricing page for the latest figures.

If you're new to the category entirely, start with our guide on what an online booking system actually is, then come back here to pick a free plan.

Why you need an online booking system

If you're taking bookings through Instagram DMs, WhatsApp, or email back-and-forth, you already know the failure mode: a client asks if Thursday at 2 is free, you reply four hours later, and they've booked someone else. An online booking system replaces that with a page showing your real availability - clients pick a slot, get a confirmation, and your calendar updates automatically.

The reason to start with a free plan isn't just avoiding a subscription. It's that you can't evaluate a booking tool from its features page. The real test is setting it up: connecting your calendar, creating a service, embedding it on your site, and putting a real booking through. A free plan lets you run that test on three or four tools in an afternoon and pick the one that fits - no card details, no trial countdown.

What to look for in a free plan

Free plans differ far more than paid plans do. Four things determine whether a free tier is usable for your situation or just a demo:

1. The booking cap. Some free plans cap monthly bookings (Setmore at 200, SimplyBook.me at 50, Astrocal at 10). Others don't cap bookings at all but restrict something else instead. Know which limit you'll hit first - a busy salon burns through 50 bookings in a week, while a consultant taking discovery calls might never hit 200.
2. Branding. On most free plans, your clients see the tool's branding on your booking page - "powered by [Tool]". If your brand matters, check which tier removes it. It's almost never the free one.
3. Payments and deposits. Can clients pay at booking time on the free plan? Setmore, TidyCal, and Astrocal allow it; Zoho Bookings doesn't; SimplyBook.me makes payments consume your single free feature slot. For service businesses, deposit collection is the single most effective no-show reducer - check whether it's included or gated.
4. API access. If you're a developer building booking into a product, this is the deciding factor. Most tools lock the API behind paid plans entirely (TidyCal, SavvyCal) or restrict key parts of it (Calendly's webhooks are paid-only). Discovering the API is behind a $40/month plan after you've built your prototype is a painful surprise.

There's a fifth thing worth checking that nobody advertises: renewal terms. At least one tool in this list (SimplyBook.me) requires you to manually renew your free plan every month, and deletes your account after three months if you don't.

Quick comparison

Free-tier limits only - paid plans are covered in each tool's section. Astrocal's figures are current; competitor figures were verified at the time of writing.

One pattern worth noticing before you read the table: most tools cap capability on free (features, users, API access) and leave booking volume uncapped. A few - Setmore, SimplyBook.me, and Astrocal - cap volume instead, and differ in how much capability they include under the cap. Which trade suits you depends on whether you're running a full diary today or building and validating something first.

Calendly

Calendly's free plan has no booking cap, which surprises people - the limits are elsewhere. You get one event type and one calendar connection. For a consultant who offers exactly one kind of meeting ("30-minute intro call"), that's genuinely workable forever. The booking flow is the most polished in the category, and setup takes about five minutes.

The single event type is the wall most people hit. The moment you want a 15-minute call and a 60-minute session, you're on the Standard plan at $10/seat/month (annual). Branding removal also requires a paid plan, and even paid embeds are recognisably Calendly - it's not a white-label product at any tier. On the developer side, basic API endpoints are available on free, but webhooks require a paid plan, which rules out most real integrations.

Free plan verdict: the best free option if you're one person with one meeting type and no need for payments. See our Astrocal vs Calendly comparison for the full head-to-head.

Cal.com

Cal.com's free cloud plan is the most generous of the mainstream tools for individuals: unlimited event types, unlimited bookings, Stripe payments, and real API access - limited to one user. If you're a solo operator and don't need team scheduling, it's hard to hit a wall. There's also the self-hosting option: the entire product is open source, so "free" can mean running it on your own server with no plan limits at all.

The trade-offs match the audience. Self-hosting requires a server, a PostgreSQL database, and ongoing maintenance - free in licence cost, not in time. On the cloud plan, the one-user limit means any team use (round-robin, collective events) starts the Teams plan at $12/user/month (annual). Service-business workflows - multi-staff with different service types, intake-heavy bookings - are less polished than purpose-built tools.

Free plan verdict: the strongest free tier for a technical solo user, and the only real option if self-hosting matters to you.

TidyCal

TidyCal's free plan quietly became one of the better ones: unlimited bookings, unlimited booking types, paid bookings via Stripe or PayPal, recurring and package bookings, and embedding on your own site - all at $0. The catch list is specific: one calendar connection, full TidyCal branding on your booking page, and no API access, group bookings, custom intake questions, or booking limits.

TidyCal's real pitch is the next step up: a $29 one-time lifetime plan (via AppSumo) that adds 10 calendar connections, group bookings, custom intake questions, and API access. In a category of monthly subscriptions, paying once and being done is genuinely distinctive. The product is built to solve a simple problem simply - if you need multi-staff scheduling or deposits (it takes full payments only, not partial deposits), you'll outgrow it.

Free plan verdict: the best free plan for a solo operator who wants paid bookings without a subscription - and the cheapest upgrade path in the category when you need more.

Setmore

Setmore has the most generous free plan for small teams: up to 4 users and 200 appointments per month, with payments via Square, Stripe, or PayPal included on free. A branded booking page, email confirmations and reminders, and decent mobile apps round it out. For a two-person studio doing a handful of bookings a day, this is a real free plan, not a teaser.

The gaps are operational. Calendar sync on free is one-way only - Setmore reads your Google Calendar but doesn't write back, which is how double-bookings happen. SMS reminders, recurring appointments, two-way sync, and branding removal all require Pro, which is at least cheap: $5/user/month on annual billing ($12 monthly). And 200 appointments sounds like a lot until you're a busy salon - that's roughly 9 per working day.

Free plan verdict: the pick for small teams of 2-4 people who need payments on free and can live with one-way calendar sync.

Zoho Bookings

Zoho Bookings' free plan is shaped like a textbook free tier: one user, one event type, one connected calendar. Within those walls it's solid - unlimited appointments, two-way calendar sync (Zoho, Google, or Microsoft 365), automated email confirmations and reminders, and website embedding. Notably, the two-way sync on free is better than Setmore's one-way.

There are no payments on the free plan at all, and every axis that matters for growth - users, event types, calendars - is capped at exactly one. The real reason to pick Zoho Bookings is the ecosystem: if you already run Zoho CRM, Mail, or Desk, bookings flow into those systems natively. Paid plans start at $6/user/month (annual). If you're not already a Zoho user, there's little reason to start here.

Free plan verdict: fine for a solo founder with one service who's already in the Zoho ecosystem; limiting for everyone else.

SimplyBook.me

SimplyBook.me's free plan gives you 50 bookings per month, one staff provider, a hosted booking website, an embeddable widget, and exactly one "custom feature" from its marketplace. That last mechanic is the thing to understand before signing up: SimplyBook.me's architecture makes almost everything a custom feature - deposits, intake forms, memberships, coupons - and the free plan lets you pick one.

Two more catches are unusually sharp. The free plan must be manually renewed every month from your dashboard, and accounts left unrenewed for three months are permanently deleted - along with your booking history and your company URL. Email notifications also have daily and monthly caps on free. The breadth is real (it supports more industries and languages than most competitors), and paid plans start at $11.50/month (annual) with 100 bookings. But the free tier demands more attention than any other on this list.

Free plan verdict: feature-rich but high-maintenance. Only choose it if one specific custom feature (say, deposits) matters more to you than the renewal hassle.

Astrocal

Astrocal's free plan deliberately trades volume for capability. The plan includes 10 bookings per month, while the core integration stack - the full REST API and MCP server, webhooks, two-way calendar sync (Google, Outlook, CalDAV), Stripe paid bookings, cancellation and rescheduling flows, and the embeddable widget - is included at $0. There's also no per-seat pricing on any plan, so adding team members doesn't increase the bill.

That shape follows from who it's for. Astrocal is API-first scheduling: developers embedding booking into a product, technical founders who want the booking flow on their own domain, and AI-agent builders using the MCP server. The free plan lets that audience evaluate the core integration stack before paying: a full read/write REST API, webhooks, an embeddable widget, and native MCP tools covering availability, booking, cancellation, rescheduling, and waitlists. Astrocal's edge is this full-lifecycle combination in a hosted product, with no infrastructure to run and no per-seat pricing as your team grows. The core API, webhook, and MCP surface stays the same when you upgrade; paid tiers raise usage limits, add calendar connections and branding controls, and lower the platform fee. Paid bookings on free carry a 1% platform fee, and limits get a 10% grace period before new bookings are declined - existing bookings are never affected.

The trade-offs: the 10-booking cap means the free tier is for building and validating, not running a full diary - volume comes with the paid tiers, starting at $12/month flat (not per seat) for 50 bookings, then $49 for 500. Custom widget branding also starts at the paid tier. And Astrocal is newer than everything else here, with a smaller community and fewer third-party tutorials.

Free plan verdict: the strongest fit for developers and AI-agent builders who want hosted scheduling, full-lifecycle MCP tools, and waitlist support without paying to validate the integration. It's also built to scale with teams because adding members doesn't add seat fees. If you're a non-technical solo operator who needs raw booking volume on free, Cal.com or TidyCal fit better. Full details on the pricing page.

Which free plan is best for you?

The table tells you the limits; this tells you the pick. Match yourself to a row and you can skip re-reading the reviews:

• You're a developer, technical founder, or AI-agent builder. Astrocal is the strongest hosted choice when you need a complete API and agent-ready workflow, including waitlists. Cal.com is the alternative if open source or self-hosting matters more.
• You're a solo professional who needs one meeting type. Calendly. No booking cap, the most polished flow in the category, and the single event type won't bother you until it does.
• You're a solo operator who wants paid bookings and volume, free. TidyCal, with Cal.com close behind. Both give you unlimited bookings and Stripe payments at $0.
• You're a small team of 2-4. Setmore is the practical free choice for a service business that can live with one-way calendar sync. Astrocal fits a technical team validating an integration; a team running a live diary will likely need its $12 Launch plan.
• You're already in the Zoho ecosystem. Zoho Bookings. Don't overthink it.
• You need one specific gated feature (like deposits) on free. SimplyBook.me's feature-slot model can cover it - go in with eyes open about the monthly renewal requirement.

How to set up your free booking page in 5 minutes

The setup flow is nearly identical across every tool in this list. Using Astrocal as the example:

1. Create an account. Sign up free - no card required on any tool covered here.
2. Create an event type. Name, duration, and optionally a price: "Intro call - 30 min" or "Consultation - 60 min - £75."
3. Connect your calendar. Link Google Calendar or Outlook so existing commitments block booking slots automatically. Prefer tools with two-way sync (Astrocal, Cal.com, Zoho) - one-way sync is how double-bookings happen.
4. Set your availability rules. Working hours, minimum notice, buffer time between appointments.
5. Share or embed. Every tool gives you a hosted booking page URL immediately - put it in your Instagram bio or email signature. To take bookings on your own website, paste the embed snippet. Astrocal's booking widget is one script tag.

Put a test booking through before sharing the link. Book yourself, check the confirmation email arrives, check the event lands in your calendar, and cancel it. Five minutes of testing catches the configuration mistakes that otherwise surface with a real client.

When to upgrade: signs you've outgrown a free plan

Free plans are for validating that online booking works for you. These are the signals it's time to pay:

• You're hitting the booking cap. Turning away bookings to stay on a free plan is the tail wagging the dog. Compare the maths: at Astrocal's $12/month for 50 bookings, the software costs pennies per booking.
• Branding is costing you trust. If clients pay you £75 a session, "powered by [Tool]" on your booking page undercuts the brand you're building. Branding removal is a paid feature everywhere.
• You need deposits, not just payments. Full-payment-only is common on free tiers. Partial deposits - the effective no-show killer - typically arrive with paid plans.
• You've added a team member. Free plans are almost universally solo (Setmore's 4 users is the exception). Check the pricing model before you upgrade, not after: per-seat tools (Calendly, Cal.com, Setmore) scale with headcount; flat-rate tools (Astrocal) don't.
• You need the API or webhooks. If booking data needs to flow into your own systems, check which tier unlocks the API on your tool - or switch to one where it's free.

The upgrade decision is also a chance to re-evaluate. Switching booking tools is typically a few hours of setup, not a migration project - if your free plan's tool doesn't fit anymore, the full comparison of scheduling tools covers paid tiers in depth.

Common questions