Mustard
Mustard is a free, open-source web platform for running an auction and marketplace, with features for listings, purchasing, payments and communication.
What Mustard is
Mustard is a free, open-source web platform for running an auction and marketplace, with features for listings, purchasing, payments and communication. Users can create accounts and classified adverts, offer items through auctions and make purchases. PayPal and Stripe are listed payment integrations, and the platform includes payment processing, email notifications and messaging. Listings can include photo and video uploads, while user feedback, a helpdesk and dispute resolution support marketplace interactions. Mustard also lists full documentation and API access. Hamjoint CIC develops and maintains it for Hamjoint, a marketplace dedicated to amateur radio and electronics. The platform uses Laravel, which is licensed under MIT. Mustard itself is under GPL3: commercial use is allowed, but derivative works must use the same licence. Its listed plan is free. The available platform is web.
Good
- Free plan listed as free
- Supports auctions and classified adverts
- Integrates with PayPal and Stripe
- Includes messaging and dispute resolution
- Offers API access and documentation
Watch out
- Derivative works must use the GPL3 licence
- Listed platform is web
Who it suits
Mustard suits people looking for an open-source web marketplace with auctions, purchasing and payment integrations. Its stated focus is amateur radio and electronics through the Hamjoint marketplace.
Verdict
Mustard brings core marketplace functions together, including auctions, payment processing and buyer-seller communication. Its GPL3 terms allow commercial use but require derivative works to retain the same licence.
Plans and prices
From Mustard's own pricing page, checked 8 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Mustard | Free | GPL3 licence · commercial use allowed · derivative works must use the same licence |
The facts
Each one read from Mustard's own pages, with the date it was checked.
What it does
- Accounts and listings
- Features include user accounts and classified adverts.checked 8 Oct 2026
- Auctions and purchasing
- The platform includes auctions and a purchasing system.checked 8 Oct 2026
- Communication
- Mustard includes email notifications and messaging.checked 8 Oct 2026
- Documentation
- The site lists full documentation as a feature.checked 8 Oct 2026
- Framework
- Mustard is built on the Laravel framework, which the site says is licensed under MIT.checked 8 Oct 2026
- Help and disputes
- The listed features include helpdesk and dispute resolution.checked 8 Oct 2026
- Licence
- Mustard is licensed under GPL3, which allows commercial use but requires derivative works to use the same licence.checked 8 Oct 2026
- Maintainer
- Hamjoint CIC develops and maintains Mustard for Hamjoint, a marketplace dedicated to amateur radio and electronics.checked 8 Oct 2026
- Media and feedback
- The platform supports photo and video uploads and user feedback.checked 8 Oct 2026
- Payments
- The listed payment integrations are PayPal and Stripe.checked 8 Oct 2026
- Product
- Mustard is an open source auction and marketplace platform similar to eBay.checked 8 Oct 2026
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