# End-of-video 'respond' prompt on Loom: +13% comments

- Outcome: Won
- Page type: Other (SaaS)
- Elements: Cta copy, Viral loop
- Test run by: [Loom](https://liftarchive.com/practitioners/loom/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://growth.design/case-studies/loom-psychology
- Page: https://liftarchive.com/test/gd-loom-reply-prompt-end-of-video/

Loom replaced a generic call to action at the end of shared videos with a prompt to respond to the sender, and comments across all Loom videos rose 13%. Responding then leads the viewer into sign-up. Loom made the change; it was published as a Growth.Design case study, and it is a before-and-after comparison, not a reported split test.

## Result

**+13% comments**

- Comments left on Loom videos: up 13% across all videos, per Growth.Design.
- The metric is comments, not sign-ups. No sign-up figure was shared.
- No sample, test method or time frame was given.

## Control

When a shared video ended, viewers saw a generic call to action to get Loom for free.

## Variant

When the video ended, viewers were invited to reply to the sender, with pre-filled text to make starting easy. Replying then led into sign-up.

## Why it likely won (our reading)

- Someone who just got a video from a colleague wants to answer them, not buy software. The prompt matches that goal.
- Pre-filled text removes the blank-box problem of starting a reply.
- Growth.Design notes the old button repeated a sign-up link already shown several times in the interface.

## Caveats

This is a before-and-after change with no stated test method, sample or source for the number. The reported gain is in comments, not sign-ups.

## How to run this test

- Hypothesis: If we replace the generic sign-up prompt shown to recipients with an invitation to respond to the sender, then more recipients will engage because it matches what they came to do.
- Primary metric: Share of recipients who respond
- Guardrail: Recipient sign-up rate
- Guardrail: Spam or low-quality replies
- Guardrail: Sender retention
- Who should test it: SaaS products where users share content with non-users, such as video, docs or design files. It fits less where recipients have no natural reason to reply.

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Credit: Loom ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/gd-loom-reply-prompt-end-of-video/).
Usage: Free to use, quote and build on, with credit and a link: name the practitioner or organization that ran the test and link to its LiftArchive page. The results belong to the practitioners who ran and shared them; the summaries and commentary are LiftArchive's.