21 Review Request Subject Lines That Get Opened
The review you never collected died in an unopened inbox. Twenty-one subject lines that lift open rate, and the patterns behind why they work.
What makes a review request subject line get opened?
Three things, and they reinforce each other: brevity, relevance, and a human voice. A short line survives the inbox preview on mobile, where most of these are read. Relevance means the line refers to something the customer actually did, usually the specific product they bought, so it reads as addressed to them and not blasted to a list.
The human voice is the part most brands skip. A line that sounds like a colleague asking a small favour gets opened. A line that sounds like a marketing department running a campaign gets archived. The patterns below are just different routes to that same feeling.
The question lines: invite a reply, not a task
A question subject line shifts the reader into a reply mindset before they have opened anything. It frames the email as a small conversation rather than a chore, and a conversation is harder to ignore than a request.
Keep the question genuine and answerable in one breath. The goal is the open, so the line should make the reader want to give the answer that is already forming in their head.
- How are the [product] working out?
- Did the [product] fit?
- Quick question about your order
- Would you buy it again?
The personal lines: a note, not a campaign
Short, personal subject lines tend to outperform promotional ones, because the inbox is now trained to filter anything that looks like a broadcast. A line with no offer, no urgency, and no reward reads as a person reaching out, and that earns a second of attention that a sale never will.
Use the sender name and the first name where you have it, and let the subject stay almost plain. Plainness is the signal here, not a flaw.
- A small favour, [first name]
- Mind sharing a quick thought?
- Thank you, and one ask
- From [founder name] at [store]
The product-named lines: relevance you can see
Naming the product purchased lifts open rate through relevance. The line proves, in the preview pane, that this email is about the reader and the thing they chose, not a generic nudge sent to everyone who ever bought anything.
This is the most reliable pattern of the five, because it removes the reader's first question (is this for me?) before they have to ask it. Pull the product name from the order and keep the rest of the line out of the way.
- How are your [product name]?
- Your thoughts on the [product name]
- About the [product name] you ordered
- [Product name]: worth it?
The curiosity lines: one concrete hook
Curiosity works when it is specific, not vague. A line that gestures at one concrete thing inside (a question, a short form, a single tap) opens a small loop the reader wants to close. A line that teases nothing in particular reads as a trick and gets ignored.
The trade-off is honesty: never imply something the email does not deliver. Curiosity that is paid off builds trust for the next send. Curiosity that is broken trains the reader to stop opening.
- One tap, if you have a second
- We left a space for your words
- The part of the order we cannot see
- Two questions, thirty seconds
The brief lines: when fewer words win
Some of the strongest subject lines are two or three words. On a phone, a short line shows in full while a long one is cut off mid-thought, and a complete line reads as more considered than a truncated one. Brevity also signals low effort to reply, which is exactly the impression a review request wants to give.
Use these when your sender name already carries the relationship, so the subject can afford to say almost nothing and still get opened.
- Quick favour?
- Your verdict?
- How did we do?
- Worth a line?
The line gets the open. What gets the review?
A subject line wins the open, but the open is only the start. The body has to make leaving a review feel like one small action, and the review you collect has to be specific enough to be worth reading later. A line that lands the open and a body that collects a vague star rating still leaves you with proof nobody can use.
And there is a step past collection that most tools never reach. Most review apps were built for the on-page shopper and stop at the moment a review appears under the product. Getting those reviews readable, corroborated, and cited (in search and in AI answers) is the gap BetterReviews is built to close. The subject line earns the review. The work is making sure the review you earned is one a buyer, and an answer engine, can actually find.
- Should I put the product name in the subject line?
- Yes, where you can pull it from the order. Naming the product the customer bought lifts open rate through relevance, because it shows the email is about them and their purchase rather than a generic blast. It answers the reader's first question (is this for me?) before they have to ask it.
- Do questions work better than statements in a subject line?
- Often, yes. A question invites a reply mindset, framing the email as a small conversation rather than a task. Keep it genuine and answerable in one breath, so the line makes the reader want to give the answer already forming in their head.
- How long should a review request subject line be?
- Short enough to show in full on a phone, where most are read. Two to six words is a safe range, and some of the strongest lines are two or three. A complete line reads as more considered than one cut off mid-thought, and brevity signals a low effort to reply.
- Why do my review requests get low open rates?
- Usually because they read as promotional. Reward language, urgency, and campaign phrasing trigger the same filter the inbox uses for sales. A short, personal line with no offer reads as a note from a person, and that earns the open a broadcast cannot.