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AI that extends songs, a $150Million payments tool, and a free calculator hub
Eromosele Ebohon & Chris Bulen
November 10, 2025
Hey friends 👋
Good afternoon! It’s Chris & Daniel here with another edition of Startups.fyi — where we uncover the smartest tools, underrated startups, and business models worth stealing.
As always, we’d love to hear from you! If there’s something you’d like us to cover, just reach out to us on X and say hi 👋🏾.
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Today: 6 successful startups across 6 different categories.
The USA holiday honoring US Veterans is tomorrow (Nov 11, 2025), so today’s issue will be briefer than normal - no Roundup today. However today, we have a special Spotlight - a startup generating $150 Million in Revenue!😊 This easy-to-use tool helps you track emotions, share comments, and see stats and also requires no login (Pre-revenue)
🎵 Discover this tool that lets you easily extend and enhance your music tracks with AI Music Extender and enjoy the unlimited fun of music (Pre-revenue)
🔍 Never lose a backlink again with this easy-to-use tool that lets you detect broken links before your competitors (Pre-revenue)
🧮 This tool offers a wide range of free online calculators covering financial (loans, interest, mortgages), health (BMI, water intake), scientific, unit conversions and other everyday uses. Makes $100/month for the solo founder.
🏪 Here is a no-code software platform built specifically by restaurant operators for restaurant operators. This tool makes $300/month for the solo founder.
Pay anyone, anywhere, all in one place with no extra fees until 2027. Sign up for any Justworks plan now and add International Contractors at no extra cost until 2027. That means paying every employee and contractor all in one place, without the usual $39/month per contractor fee.
With Justworks, you can:
● Hire and pay top contractors around the world (free until 2027)
● Onboard, pay, and manage your employees in one place
● Offer better benefits for your team
● Access 24/7 personalized support
Get started with Justworks now to get this exclusive offer and see how far your team can grow.
💵 Launched in 2025 and already past $150M in revenue, this VC-backed tool lets you accept global payments instantly with support for cards, crypto, CashApp, automated taxes, refunds, and simple 1-click checkouts.
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That’s it for this time! See you again next week.
— Chris (@ChrisBulen)