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New customers get 15% off their first purchase made in The Theory app; enter the code at checkout. Exclusions apply.
Copy this code and use at checkout
New customers get 15% off their first purchase made in The Theory app; enter the code at checkout. Exclusions apply.
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Use code for a solid 25 % off your order. Restrictions may apply.
Copy this code and use at checkout
Use code for a solid 25 % off your order. Restrictions may apply.
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Coupon valid for full-priced items, for new and existing customers
Copy this code and use at checkout
Coupon valid for full-priced items, for new and existing customers
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Copy this code and use at checkout
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Coupon only valid for in-app orders
Copy this code and use at checkout
Coupon only valid for in-app orders
You could try expired codes, sometimes you might find one that works
💡 What is the best value and fully functional THEORY discount code available in October 2025?
The best value and fully functional THEORY discount code currently available is (APPX15), offering customers a discount of 15% in October 2025.
How to use a THEORY promo code
Follow this guide and learn how to successfully apply a THEORY promo code at checkout
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1Add all the products you want to order in your THEORY online shopping bag
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2Click on the Shopping Bag symbol in the top right corner to confirm the order
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3On the order summary page, locate the "Promo code" field and paste the exact promo code
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4Click "Apply" to redeem the offer and your discount will be automatically calculated
Popular THEORY Promo Codes & Sales
| Promo Code | Discount | Expiry Date |
|---|---|---|
| APPX15 | Theory app coupon code: 15% off first purchase | Expires 2025-10-31 |
| PASS25 | Theory sitewide discount coupon: save 25 % Off your order | Expires 2025-10-31 |
| W-7AAT-LMUM-BX | Enjoy a 15% discount site-wide with this THEORY discount code | Expires 2026-07-31 |
| APPX15 | New app users on THEORY.com get a 15% discount using this promo code | Expires 2026-04-30 |