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Category · Top 6

Top · Comparison

The best appointment reminder systems

Honest comparison of 6 tools to automate WhatsApp, SMS and email reminders. When to choose each one and what to look for in the pricing model.

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There are three types of products that send appointment reminders: 1) all-in-one appointment software with reminders included (Marai, Acuity, Calendly, Setmore), 2) messaging platforms you integrate with your system (Twilio, Vonage, Sinch), 3) standalone SMS/WhatsApp reminder services. For most appointment businesses, option 1 is the most efficient because it integrates the reminder into the booking flow with no extra configuration cost.

Below are the 6 most-used options in Spain, with criteria on pricing model, supported channels, GDPR and personalisation level. The choice depends on whether you already have appointment software (then reminders should come included) or you are building the flow from scratch (then you probably want an all-in-one to avoid manual integrations).

Top 6 · ranking

  1. 1

    Marai

    All-in-one · WhatsApp + SMS + email

    Integrated reminder system on WhatsApp, SMS and email with customisable templates, default 24h + 2h cadence and confirm/cancel buttons. No additional cost within the plan, no per-booking commissions. Native GDPR compliance and consent records. Limitation: focused on appointment businesses — not a generic messaging provider for use cases beyond appointments.

  2. 2

    Acuity Scheduling

    Appointment software · US

    Appointment software with email and SMS reminders included. Good interface, integrations with US stack (Google Workspace, Square, Stripe). Limitation: WhatsApp not native, SMS often on higher plans, English support and USD pricing. Uneven fit with the Spanish proximity market.

  3. 3

    Calendly

    B2B online scheduling

    Leader in B2B online scheduling with email reminders included in paid plans and SMS on higher plans. Excellent calendar and productivity tool integration. Limitation: WhatsApp not native, reminders are simple without the richness of a vertical proximity product, and the model assumes the client has an active email (not always the case in proximity sectors).

  4. 4

    Setmore

    Scheduling · Free plan

    Appointment software with free email reminders on the Free plan and SMS on higher plans. Simple Spanish interface. Limitation: template flexibility and WhatsApp flow quality is inferior to specialised vertical products. Good zero-cost entry point for sole traders.

  5. 5

    Twilio

    Platform · Pay-as-you-go

    Professional messaging platform for SMS, WhatsApp Business API and voice. Pay-as-you-go, maximum flexibility. Excellent for companies with a technical team that wants to build custom flows. Limitation: not a ready-to-use product — requires development. Overkill for a hair salon or a physiotherapist — complexity works against it for small cases.

  6. 6

    Local SMS platforms

    SMS · Spain

    A constellation of Spanish providers (LabsMobile, Esendex, Mensatek among others) offering SMS via API or web panel from a few cents per message. Good as backup when WhatsApp fails or as the only channel in sectors with older clientele. Limitation: SMS only, do not include appointment logic — you have to build the integration with your schedule yourself.

Reminders included vs separate service

If your appointment software already sends reminders well (24 h + 2 h via WhatsApp with confirmation), you do not need another product. You are duplicating cost without additional value. Marai, Acuity, Calendly and most serious products include reminders in mid-tier plans.

If your current software only sends email reminders, or they are only on top plans, or you have no software and rely only on a calendar, there is a case for a dedicated service like Twilio or a local SMS platform. But then you have to build the "find upcoming appointments + send message + process reply" logic yourself or via your technical team.

What is Marai?

Marai is appointment-management software with an AI WhatsApp bot, automated reminders and Stripe payments. Built for Spain and the EU, with native GDPR compliance and 0 % booking commissions.

Your questions

Frequently asked questions

The most important answers before you pick an appointment software.

Do I need a separate service if my software already sends reminders?

No. If the included reminders cover WhatsApp + SMS with 24 h + 2 h cadence and confirmation buttons, you are covered. Adding another service duplicates cost with no value.

Which is cheapest?

If you value only monthly cost, Marai on the basic Free plan allows reminders at no additional cost. Twilio or SMS platforms by consumption can be cheap at low volume but require development to build the flow.

Which one is GDPR-compliant by default?

Any product with European Union servers and a signable DPA. Marai hosts in the EU and signs a DPA from origin. With US products you have to check international transfer clauses.

Is WhatsApp always the best option?

In Spain, for proximity sectors with WhatsApp-active clientele, yes. For older clientele or sectors where email is standard (B2B, private healthcare with insurance), email + SMS backup may be better.

Next steps

Keep exploring

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Before you start

The most common questions

The questions we get every week — answered straight, no fluff.

Do I need a credit card to start?

No. The free plan is permanent and never asks for a card. You can be live in under 5 minutes with just your email and a mobile number.

How long does setup take?

Around 5 minutes. Import your services, connect your WhatsApp Business number and publish your booking portal. No installs, no training required.

Will I lose my data when migrating?

No. We offer a guided migration from Fresha, Booksy, Calendly and spreadsheets. Clients, services and appointment history all carry over.

Is it hard for my team to use?

No. Marai is designed for non-technical staff: a clear interface, human support and onboarding included. Your team gets it on day one.

Is it GDPR compliant?

Yes. EU-hosted servers, AES-256 encryption at rest, processing records ready for the data protection authority, and digital consent for your clients.

Can I cancel anytime?

Yes. No lock-in, no penalty. One click to cancel and you can export all your data as CSV at any time.

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