Never wonder 'is this still good?' again! UseByWhen.com instantly tells you how long 100+ household items last after opening. From ketchup (6 months) to mascara (3 months) - your pocket expiration expert. Reddit-validated with 22k+ upvotes!
No reviews yetBe the first to leave a review for UseByWhen
Maker
š
After seeing a Reddit post get 22,000+ upvotes with people literally saying "I would pay for this!" - I knew I had to build it. We've all stood in our kitchen holding expired mayo or found mystery mascara wondering "is this still safe?" There was no simple, instant way to check expiration dates for EVERYTHING in your home.
What's new and unique:
š Instant fuzzy search - type "kechup" and it knows you mean "ketchup"
š± Mobile-first design - built for those "standing in your fridge" moments
š Beyond food - covers beauty products, household items, AND leftovers
ā” No signup required - just search and know immediately
šÆ Real data - sourced from USDA, FDA, and manufacturer guidelines
What I'm most proud of:
The search intelligence! It handles typos, understands "opened vs unopened," and gives you the exact storage info you need. Plus watching beta testers go "OMG I had no idea honey never expires!" or "Wait, mascara is only 3 months?!"
Built this in 5 days from Reddit idea to live site. Sometimes the internet just tells you exactly what to build! š
Report
Maker
Quick update: I'm actually working on a suite of simple, focused tools like this. UseByWhen was my first experiment in building single-purpose utilities that solve one problem really well.
My philosophy: instead of building one bloated app that does everything poorly, create multiple clean tools that each do one thing perfectly.
Next up: I'm launching PrecisionConvert.io (unit converter for professionals) and have a few other single-purpose tools in the pipeline.
For UseByWhen specifically, planning to add:
- More food categories (dairy, condiments, leftovers)
- Better mobile experience
- Meal planning integration
- Maybe a simple "what's expiring soon" widget
Would love to hear what other simple, single-purpose tools you'd find useful in your daily life. Sometimes the best solutions are the simplest ones!
Quick update: I'm actually working on a suite of simple, focused tools like this. UseByWhen was my first experiment in building single-purpose utilities that solve one problem really well.
My philosophy: instead of building one bloated app that does everything poorly, create multiple clean tools that each do one thing perfectly.
Next up: I'm launching PrecisionConvert.io (unit converter for professionals) and have a few other single-purpose tools in the pipeline.
For UseByWhen specifically, planning to add:
- More food categories (dairy, condiments, leftovers)
- Better mobile experience
- Meal planning integration
- Maybe a simple "what's expiring soon" widget
Would love to hear what other simple, single-purpose tools you'd find useful in your daily life. Sometimes the best solutions are the simplest ones!
Thanks for trying UseByWhen!