What is an Explainer Video Test?
An explainer video test is a short video, 60 to 120 seconds, that shows how your product would work before it exists, followed by one link: join the waitlist, book early access or pre-order. You share it where your customers spend time and measure how many viewers act. The video can be a screen recording of mockups, a narrated slideshow or you walking through a clickable prototype.
The best-known case comes from Dropbox. According to Drew Houston’s own slides from the Startup Lessons Learned conference, covered by TechCrunch in 2011, a demo video posted to Digg in March 2008 took the beta waiting list from 5,000 to 75,000 people overnight. The product was hard to explain in words and easy to understand when people SAW files appear on another computer. That is the exact situation this method is for.
When should you use it?
Use it when:
- Your product is easier to show than to describe: software, apps, a new workflow, a gadget, a before-and-after result.
- A landing page gets visitors but a weak sign-up rate, and you suspect people do not understand what you offer.
- Your audience lives on video platforms (YouTube, TikTok, Instagram, LinkedIn) more than on web pages.
Skip it when the product is simple to explain in one sentence (a cleaning service, a tutoring session); a landing page test is faster. Leave it aside too if you cannot show anything concrete yet. A video of you talking about the idea measures how much people like you.
How do you do it, step by step?
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Write the script in three parts. Problem (15 seconds): one specific moment of frustration, in your customer’s words. Product in action (60 seconds): the 3 to 4 steps someone takes, shown on screen. Who it is for and the next step (15 seconds): “If you [situation], join the first group at [link].” Our rule of thumb: spoken English runs at about 140 words a minute, so 90 seconds is roughly 210 words.
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Make the visuals without building the product. Three options, from cheapest up: slides in Google Slides with screenshots you mock up, Figma screens you click through (a Figma clickable prototype is perfect here), or a physical sample on a table filmed with your phone. Show results with realistic data: real names, real prices, real dates.
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Record with a free screen recorder. Loom’s free Starter plan allows 25 videos and screen recordings up to 5 minutes, enough for several takes. Record voice with a phone headset in a small room with soft furnishings. Clear sound matters more than sharp pictures, so fix echo before you worry about resolution.
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Add captions and a first frame that explains itself. A lot of people watch with sound off, so burn in captions or upload a caption file. The first frame should show the problem in words on screen: “Spent 40 minutes chasing a client for an invoice again?”
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Put the video next to one clear action. Upload it to YouTube as unlisted or public, embed it on a simple page, and put one button under it linking to a Tally form. In the video description, put the link in the first line. On social platforms, put the link where the platform allows it (bio, first comment, link sticker) and mention it in the last 10 seconds of the video.
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Share it in 3 places for 1 to 2 weeks. Pick communities and channels where your customers already are. Post the video natively where possible, with a plain caption: “I’m building this for [person]. Here’s how it would work. Would you use it?” Ask for honest reactions, not likes.
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Measure three numbers. Views (from each platform), average percentage watched (YouTube Studio shows audience retention for your videos), and sign-ups (from the form). Divide sign-ups by views per channel. Read the comments, which tell you what people misunderstood.
What does a worked example look like?
Say Kemi wants to build a booking tool for hairdressers who work from home. It sends clients reminders and takes a no-show deposit when they book. Hairdressers she spoke to said “I already use WhatsApp” whenever she described it in words.
So she makes a 90-second video. Problem: a voice-over over a phone screen full of unanswered WhatsApp messages and “A no-show costs you a whole afternoon.” Product: Figma screens showing a client booking a slot, paying a €10 deposit and getting a reminder the day before. Close: “For hairdressers who work from home. Join the first 50 at the link.”
She posts it in two hairdresser Facebook groups and on her Instagram, and sends it to the 12 stylists she interviewed. In 10 days: 640 views, an average of 58% watched, and 37 sign-ups (5.8%). The comments are the real prize: 9 people ask “Can clients still message me on WhatsApp?” Her next version shows the tool sending reminders through WhatsApp, and the sign-up rate on the new video climbs.
Which free tools help?
| Tool | What you use it for | Free plan |
|---|---|---|
| Loom | Screen and camera recording with a share link | Yes, Starter plan with short recordings |
| Google Slides | Mock product screens and simple animated steps | Free with a Google account |
| Figma | Clickable screens to record as a walkthrough | Yes, Starter plan |
| YouTube | Hosting, captions and audience retention stats | Free |
| Tally | The sign-up form under the video | Yes, unlimited forms and submissions |
What mistakes should you avoid?
- A 5-minute video. Every extra minute loses viewers before the call to action. Cut it to 2 minutes or less.
- Starting with your logo or your story. Start with the viewer’s problem. Your origin story can come later, on an about page.
- Showing features instead of a result. “It has 12 integrations” means nothing. Show the moment the customer’s problem disappears.
- No link, or a link at the very end only. Put the action in the description, on the page and in the video itself.
- Counting views as demand. Views tell you how far the video travelled, while sign-ups and specific comments are the demand signal.
How do you know it worked?
Our rule of thumb for a go: at least 300 views from your target group, an average of 50% or more watched, and a sign-up rate of 3% or more of views. On top of that, look for comments that repeat your problem in their own words or ask “When can I get this?”
No-go: decent views, people stop watching in the first 15 seconds and nobody signs up. Fix the opening before you judge the idea. If retention is high but sign-ups stay low, the product is clear and not wanted, which is an answer too.
What should you do next?
Turn sign-ups into a referral waitlist so early fans can bring their friends, or use the same video in a Reddit launch post in a subreddit that allows it. If the video worked, a series of YouTube how-to videos around the same problem keeps bringing people in. The F/MS startup game can help you script and judge a test like this with an AI co-founder.
FAQ
How long should an explainer video for a startup be?
Aim for 60 to 120 seconds. That is long enough to show a problem, three steps and a call to action, and short enough that most viewers reach the link.
Do I need a finished product to make a demo video?
No. Mockups in Figma or Google Slides, a clickable prototype or a handmade sample are enough, as long as you say it is in development. Dropbox’s famous demo was used to build its waiting list during beta.
What is a good conversion rate for an explainer video test?
Our rule of thumb is 3% or more of views turning into sign-ups from a targeted audience. Compare channels separately: a niche community converts very differently from a broad social feed.
Updated 26 October 2026 · Written by the Fe/male Switch team