Why every warm-up tool’s G2 score is 4.8 and its Trustpilot score isn’t
Search any major email warmup tool on G2. You will find a score between 4.7 and 4.9. Search the same tool on Trustpilot, and in several cases you will find a materially lower score — sometimes by a full point or more. The gap is not a coincidence. It is information about what the first 90 days look like if something goes wrong.
Key takeaways
- Nearly every email warmup tool scores 4.7 or higher on G2; the same tools score materially lower on Trustpilot.
- G2 captures users who stuck with the product and reached proficiency. Trustpilot captures users who hit friction — a more predictive signal for the first 90 days.
- The G2 score tells you the tool works for people who figure it out. The Trustpilot score tells you what happens when they don’t.
The pattern
Email warmup tools are unusual in how tightly their G2 scores cluster. Most software categories have a spread — some tools at 3.5, some at 4.8. In warmup, nearly everyone is at 4.7 or higher on G2. That uniformity is suspicious on its own terms: it suggests the scores are measuring something other than pure product quality.
The clearest documented example in this category is Smartlead. As of mid-2026: 4.6 out of 5 on G2 from 300+ reviews, and 3.4 out of 5 on Trustpilot from 85 reviews. Same company, same product, same time period — a gap of more than one full point across two public platforms. Both sets of reviewers are describing real experiences. They are not describing the same experience.
Scores and review counts move over time — verify both at G2 and Trustpilot before citing them.
Why the two platforms attract different reviewers
This is not about one platform being more honest than the other. It is about who each platform reaches at the moment they write a review.
G2 — Users who stayed
G2 reviews skew toward users who invested enough time to reach proficiency, got value from the product, and wanted to leave a positive note. The review prompt appears inside the product, often after a positive milestone. The typical G2 reviewer has already cleared the learning curve.
Best used to understand: How the tool performs for users who figured it out
Trustpilot — Users who left frustrated
Trustpilot reviews skew toward users who hit friction, couldn't resolve it, and went looking for somewhere to say so. The review prompt is often triggered by a billing event, a cancellation, or a support experience that did not resolve. The typical Trustpilot reviewer is documenting why they stopped.
Best used to understand: What the first 90 days look like if it goes wrong
What this means when you are evaluating a tool
A 4.8 G2 score tells you something real: users who stuck with the product and figured it out are generally satisfied. That is worth knowing. It is not the same as knowing what the onboarding experience looks like, whether billing works cleanly, or what happens when you contact support during a live deliverability problem.
Trustpilot scores — especially when they diverge sharply from G2 — are a more predictive signal for the first 90 days. They capture users who hit exactly those friction points. Reading the actual review text on both platforms, rather than just the aggregate score, is where the useful information lives.
Specific things to look for in Trustpilot review text for warmup tools: billing and cancellation experiences, support response times under pressure, what happened when accounts disconnected unexpectedly, and whether the tool explained what went wrong or went quiet.
Why warmup tools specifically
Warmup is a category where the product runs in the background. When it works, users do not think about it. When it stops working — a silent disconnection, a billing surprise, a placement score that does not match live campaign results — the user notices all at once, often at a high-stress moment, and has already been paying for weeks without realising the tool was idle.
That dynamic produces a specific type of frustrated reviewer: someone who felt the tool was operating when it was not, and whose first signal that something was wrong was a live campaign in spam or an unexpected charge. Those reviewers go to Trustpilot. The users who never hit that experience, or caught it early and resolved it, go to G2.
Neither group is wrong. Both groups are describing their actual experience. The question is which experience you want to predict before you commit.
What to ask any warmup tool before committing
Rather than relying on aggregate scores from either platform, the more useful evaluation questions are about the mechanics that produce the Trustpilot complaints:
- What happens when my account disconnects? Will I be notified, or will billing continue silently while the tool sits idle?
- Can I see the strategy before it runs, or does warm-up execute without a review step?
- What is the cancellation process? One click, or 30-day notice?
- If placement results in the tool do not match my live campaign results, what diagnostic is available?
- Is the seed network disclosed — who is in it, and how does my pool change over time?
A tool that answers all five clearly, in writing, on its website or in its terms of service, is unlikely to generate the Trustpilot reviews you are trying to predict.
The G2 score tells you the tool works for people who figure it out. The Trustpilot score tells you what happens when they don’t. The gap between them is the risk you are accepting.
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Start freeFounder & CEO of InboxPlease. Over a decade building email infrastructure for SaaS businesses; writes about deliverability, inbox placement and sender reputation.