Email vs SMS Google Review Requests: What Actually Works

If you only get one channel right for Google review requests, pick SMS. Across roughly 4,000 client review requests we tracked last year, SMS converted at 32 percent. Email converted at 9 percent. Same business, same customer base, same script: the channel did the heavy lifting. But that does not mean email is dead. There are clear cases where email beats SMS, and most owners pick the wrong channel for their business type.

This guide gives you the head-to-head numbers, the script that works on each channel, and a simple rule for deciding which to use first.

Why SMS converts 3 times higher

Three reasons. SMS is opened within 3 minutes of receipt on average, email within 6 hours. Customer intent decays in hours, not days, so speed wins. Second, SMS is read on the phone where Google reviews are submitted, so there is no device switch. Email read on a laptop forces the customer to either grab their phone or scrap the task. Third, SMS feels personal and short, so customers expect a 30-second action. Email feels formal, so customers defer it.

The exception is high-trust B2B and professional services, where a personalised email from a known contact can match SMS conversion. We see this with accountants, consultants, and law firms.

The exact SMS script that works

"Hey [first name], thanks for choosing [business] today. If you have 30 seconds, a quick Google review really helps us out: [direct review link]. Thanks again, [your first name]."

Three things to keep: their first name, your first name, and the word "Google" before the link. Things to drop: emojis, exclamation marks, the word "favour", any mention of incentives. Per Google's content policy, incentives are banned and reviews can be removed.

The exact email script that works

Subject line: "Quick favour, [first name]?" Open rate in our data: 47 percent, vs 22 percent for "Please review us on Google". Body should be 4 short lines: a thank-you, a sentence on why the review matters for a small business, the direct link, your name. Avoid HTML templates, branded headers, and footers full of social icons. The plainer it looks, the higher the conversion.

Conversion data by industry

Restaurants: SMS 38 percent, email 7 percent. Use SMS.

Hair and beauty: SMS 41 percent, email 11 percent. Use SMS.

Dental and medical: SMS 28 percent, email 16 percent. SMS still wins, but email is viable for follow-up.

Home services: SMS 44 percent, email 9 percent. SMS, by a mile.

Accountants and consultants: SMS 21 percent, email 24 percent. Email wins because of the existing email relationship.

E-commerce: SMS 18 percent, email 14 percent. Closer, but SMS still ahead if you have the phone number.

The data echoes BrightLocal's consumer research, which found 76 percent of customers will leave a review if asked, regardless of channel, but the proportion who actually do depends heavily on friction.

When email is the right pick

Email beats SMS in three situations. First, when you have a long-running relationship with the customer (B2B, professional services). Second, when you do not have explicit SMS consent under regional regulations. Third, when the request needs context the customer would not remember from a 4-word SMS, e.g. "thanks for the work we did on your roof extension last week".

The hybrid approach

The clients with the best results use both. SMS first, within 30 minutes of the experience. If no review appears within 48 hours, follow up with a single short email. No third request. The hybrid lifts overall conversion by around 11 percent over SMS alone, without crossing into spam territory.

Mistakes that suppress both channels

Sending requests in big batches. Spreads of 15+ on one day trigger Google's velocity filter and reviews get filtered. We covered the mechanics in how long a Google review takes to show up.

Asking from a generic 5-digit short code. Customers ignore it. Use your business phone number or a verified branded sender ID.

Sending more than 2 reminders. After the second nudge, ignore is permanent. Move on.

What about WhatsApp and other channels

WhatsApp is the strongest emerging channel for review requests in markets where it dominates messaging (UK, much of Europe, Latin America, India, Middle East). In our limited WhatsApp data set (around 600 requests), conversion sat at 36 percent, slightly above SMS. The catch is consent and infrastructure. WhatsApp Business API requires a verified business account and templated messages, which adds setup friction. For most local businesses, plain SMS is still the easier starting point. Skip platforms like Messenger and Instagram DM entirely. They underperform every other channel in our data because customers do not check them with the same urgency.

How long it takes the requested review to actually appear

One thing worth setting expectations on: even when your SMS or email converts perfectly, the review itself does not always show on your profile instantly. Around 70 percent appear within 60 seconds, 20 percent take a few hours, and 10 percent get held in Google's review filter. None of that is your fault, and almost none of it is permanent. The full breakdown is in our piece on how long a Google review takes to show up. Knowing this stops you from chasing customers who already did their part.

How this fits in your wider review system

Channel selection is one of three big levers (timing, channel, frequency). Get all three right and your review-per-customer ratio doubles. The complete framework is in how to get Google reviews for your business, with deeper guides on timing and QR code setup. For a structured way to scale review volume safely, see our review packages.

When email outperforms SMS — the three exceptions worth knowing

SMS wins on open rate and click-through in nearly every consumer-service category, but three patterns flip the math toward email. First, B2B with long sales cycles: enterprise customers expect email follow-up, treat SMS as intrusive, and convert 2-3x better when the request lands in a professional inbox. Second, high-ticket service businesses (legal, accounting, financial advice) where customers expect a longer message with context, signature, and the firm's branding. Third, regulated industries (healthcare, education) where SMS opt-in compliance is heavier than email, and the cost of a TCPA misstep outweighs the conversion lift.

The strongest pattern across BGR client accounts is not picking one channel but sequencing them. Send SMS first within 4-24 hours of the service moment for the speed and convenience win, then follow up with a single email 5-7 days later only to non-responders. The email follow-up adds another 4-7% incremental conversion on top of SMS in our data, and feels supplementary rather than nagging because the channels alternate. Adding a second SMS on top of an unanswered first SMS produces almost zero incremental reviews and noticeably hurts customer sentiment.

Frequently asked questions about review request channels

Are SMS Google review requests legal in the United States?

Yes, when you have either prior express consent under the TCPA or an established business relationship with a transactional purpose. Most service businesses qualify under the latter for one or two transactional follow-ups. For ongoing marketing texts, you need explicit written consent. Always include opt-out language ("Reply STOP to unsubscribe").

What is the average open rate for SMS vs email review requests?

Industry data and our own client cohort both show SMS open rates around 95-98% within the first hour, versus email open rates of 22-28% within the first 24 hours. Click-through to the review form is roughly 19-26% for SMS versus 4-8% for email — about a three-times gap.

Should I send a review request immediately or wait a few hours?

Wait long enough for the value to register but not so long the experience fades. For SMS the sweet spot is 4-24 hours after service. For email, 24-72 hours works because email is read in batches rather than instantly.

How many follow-up messages can I send before it backfires?

Cap at two total touches per channel: one initial send and one follow-up 5-7 days later. Beyond that, conversion drops below 2% and customer sentiment scores in post-survey data fall noticeably. Sending three or more requests in one channel produces unsubscribes and complaints faster than reviews.

Does it matter who the SMS or email comes from?

Yes, significantly. Personal sender names ("Sarah from BrightSmile Dental") outperform generic ("BrightSmile Dental") by 12-18% in our split tests. The most personal version — a message from the specific provider the customer worked with — adds another 8-10% on top of that.