Niche Calculator Tools
Niche calculator tools, like a rental property calculator, sold as low-priced digital products to a specific audience
Video published Sep 19, 2026 by London Leffler
Startup cost: Very low startup cost (our estimate; the video doesn’t give figures)
Source video
London Leffler · I Found a Digital Product With 0 Sales... Can I Fix It? ↗
What It Is
You build a simple calculator or spreadsheet for one specific type of buyer, such as rental property investors, and sell it for around $10, marketing it to that audience through content they already follow.
The Pitch
London rebuilds a zero-sale product and says the rental property calculator is 'not bad' because it serves a clear buyer, but that it failed because nobody knew or trusted the seller.
Who It’s Best For
Spreadsheet-savvy people who belong to the audience they're selling to.
The Truth (as we see it)
His main point is that most of these products don't sell, and his rebuild isn't shown making money yet. A calculator used for financial decisions must be accurate, and it doesn't replace professional advice. London also runs a marketing company, Evolvant, which he mentions in his videos.
Our assessment, based on the video and what’s typical across similar videos. We don’t independently verify income claims or prices.
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