SMS vs Email Review Requests: Which Actually Converts Better?

If you're asking customers for reviews via email and wondering why your conversion rate is low, the channel might be the problem. SMS and email are not interchangeable for review requests. They behave very differently, and understanding the difference will change how you build your request strategy.

The Open Rate Gap Is Enormous

SMS messages have a 98% open rate. Email open rates average around 21% across industries, and for small business transactional email, you're often looking at 15% to 18% in practice.

That's not a small gap. That's a 5x difference in the percentage of people who even see your message.

And it gets wider. SMS messages are typically opened within 3 minutes of delivery. Email messages that don't get opened in the first hour have about a 10% chance of ever being opened at all. For review requests, where timing matters (see: the 1-to-3 hour post-service window), SMS almost always reaches people when the experience is still fresh.

Conversion Rate Comparison by Channel

Open rates are one thing. Conversions are what matter.

Across consumer service industries, SMS review requests convert at 15% to 25% for satisfied customers. Email review requests convert at 5% to 10% from the same customer base.

The SMS advantage is driven by three factors:

1. Immediacy. The message appears on a screen someone is already looking at, often within minutes of the service.
2. Friction. A direct review link in a text takes one tap to open. Email requires opening an app, finding the message, clicking through, and often navigating a longer message.
3. Personal context. Text messages feel like personal communication. A request via text reads differently than a request via an email newsletter-style layout.

Compliance Requirements You Can't Ignore

SMS marketing is governed by the Telephone Consumer Protection Act (TCPA) in the United States. The rules are specific and the penalties for violations are real.

What TCPA requires for SMS review requests:

• Prior express written consent from the customer to receive text messages from you. A checkbox at booking, a signature on an intake form, or a consent field in your POS system all work. Verbal consent is not sufficient for marketing messages.
• Your business name identified in every message.
• An opt-out mechanism (typically "Reply STOP to unsubscribe").
• No messages to numbers on the Do Not Call registry.

Violations can result in fines of $500 to $1,500 per message. This isn't theoretical. Class action lawsuits under TCPA are common, and small businesses have been targeted.

Email is governed by CAN-SPAM, which is less restrictive. You need an unsubscribe mechanism, your physical address, and honest subject lines. Transactional emails (including post-purchase review requests) have more flexibility than marketing emails.

Build compliance into your intake process, not as an afterthought.

When Email Wins

SMS isn't always the right choice. Email outperforms for specific scenarios:

B2B services. If your customers are businesses (accounting clients, IT service customers, commercial contractors), email is the expected channel for post-service communication. A text message can feel informal or unprofessional in these contexts.

Complex, high-consideration services. Customers who just spent $15,000 on a kitchen renovation may prefer a more formal communication channel. Email lets you include more context, photos of the finished work, and a more detailed request.

Longer sales cycles. For services where the relationship spans weeks or months, email keeps a communication thread that SMS doesn't.

Older demographics. In certain industries serving older customers, email remains the more comfortable and expected channel for follow-up communication.

The Case for Dual-Channel Delivery

The strongest review request strategy isn't SMS or email. It's SMS and email, deployed strategically.

A practical dual-channel sequence:

1. Send SMS within 1 to 3 hours of service completion.
2. Wait 48 hours. If no review appears, send a follow-up email. Email as a follow-up rather than a primary channel works because it catches customers who missed or dismissed the text, and the email format allows for slightly more context.

This approach typically increases total review volume by 25% to 35% compared to SMS-only campaigns.

The key is suppressing the email follow-up if a review has already been left. Nothing is more tone-deaf than asking for a review someone already left. Your review request system needs to monitor new reviews and suppress follow-up messages automatically.

Building Your Request Stack

If you're starting from zero, here's the practical decision tree:

• Consumer-facing, transactional services (restaurants, salons, auto shops, contractors): Start with SMS as your primary channel. Add email as a 48-hour follow-up.
• Professional services and B2B: Email as primary. SMS optional for clients who have explicitly consented and with whom you have a closer relationship.
• Healthcare: SMS can work but requires extra care around consent documentation. Many practices find email easier to keep compliant.

The channel matters less than the consistency. A business that sends review requests by email every single time will outperform a competitor who occasionally sends a text when they remember to. Whatever channel you choose, automate it so it runs without relying on human memory.

Laudy supports both SMS and email review requests with built-in TCPA compliance tools and dual-channel automation. Start your free trial at Laudy and set up your request system in under 20 minutes.