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Comparison

Office 2021 vs Microsoft 365: Which Should You Buy?

By HelperGadget Team  ·  March 2025  ·  6 min read

When shopping for Microsoft Office, you're faced with a key choice: buy Office 2021 once or subscribe to Microsoft 365. Both have their advantages, and the right choice depends on how you use Office.

In this guide we'll break down both options so you can make the best decision for your needs and budget.

What Is Office 2021?

Microsoft Office 2021 is a one-time purchase. You buy it once, own it forever, and never pay again. It includes:

Best for: Users who want to pay once and not worry about monthly fees.

What Is Microsoft 365?

Microsoft 365 is a subscription service billed annually. It includes everything in Office 2021 plus:

Best for: Users who need Office on multiple devices or want the latest features automatically.

Price Comparison

At retail prices, Microsoft 365 costs $99.99/year while Office 2021 costs $249.99 as a one-time purchase. At HelperGadget, you can get both at a fraction of those prices:

Get Office at the Lowest Price

Whether you choose Office 2021 or Microsoft 365, HelperGadget has the best prices online with instant delivery.

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Which Should You Choose?

Choose Office 2021 if you:

Choose Microsoft 365 if you:

Our Recommendation

For most students and home users, Office 2021 Professional Plus at $14.99 from HelperGadget is the best value. You get everything you need, on one PC, forever, for the price of a pizza.

If you need Office on your phone, tablet, AND laptop, then Microsoft 365 at $9.95/year for 5 devices is an incredible deal.