Hi @GulliGulli_,

That's an interesting question. As for the email survey, would you care to clarify how many questions your survey consisted of?

I'm asking because it's usually not a good practice to nest the NPS question into a larger survey. In fact, you should keep the NPS survey question short, pithy and to the point.

What we usually do at Survicate is just ask two questions:
1. On a scale of 0 to 10, how likely are you to recommend us to a friend or colleague?
2. Depending on whether they a detractor, passive or promoter, we'd ask them "We're sorry to hear that. What can we improve?", "That's not bad. What's the main reason for your score?", or "We're happy to hear that! Would you care to leave us a review on G2?" or simialr.

So, could it be the case that you had a lower NPS score when you sent email surveys, because the survey had too many questions? By the time the user reached the NPS question, they had been fed up with the number of questions (survey fatigue).

Did the in-product survey also have that many questions, or you limited it to the NPS question only?

Also, when you run in-product surveys, people are using your product so it seems natural to them you ask for their feedback. This could encourage higher NPS scores. Whereas when you send NPS surveys by email, you're sort of encroaching upon people's inboxes. But I don't think this would account for the huge gap you mention, and you could just as well make a case for using email surveys over in-product surveys.

I can only speak from my experience at Survicate, and that is:
- We send the NPS survey in-product first, and then follow up by email after 7 days
- We didn't notice any meaningful differences in the scores we get across the two channels
- We target our NPS surveys precisely, i.e. don't send NPS to the entire customer/user base at once, but do it in batches (paying customers / long-standing customers etc.)

Could it be that with your in-product NPS survey you targeted a different user/customer base (i.e. fresh signups) than with the email survey? (i.e. customers who recently experienced product issues). I think this could partially explain the disparity between the scores.

And I said earlier that some people are great advocates of running NPS surveys only by email. Here are some of the arguments they use:
- In-product NPS surveys can be seen as interrupting the customer's workflow and disrupting them during a task
- They might therefore have a higher abandonment rate
- Even if you customise in-product surveys, they don't feel as personal as email.
- Email is said to encourage more honest responses when done right
- When you send in-product NPS surveys, the customer sentiment might be influenced by the action they're currently taking in the product
- Rather than measuring the sentiment of the overall brand and brand loyalty, you would be measuring their satisfaction at a specific interaction point or workflow, which is not what you want.