The moment someone's decided to buy, they're unusually open to buying a little more — if the little more genuinely fits. A relevant add-on at checkout raises what each customer is worth, and you've already done the hard part of convincing them to pay at all.
Offer the obvious companion
The best upsell is the thing that naturally goes with what they're already buying — the templates that pair with the guide, the extra pack, the faster support. It should read as 'oh, useful', not 'they're squeezing me'. Relevance is the whole difference.
Keep it optional and light
One clear, easy-to-decline add-on — not three, not a guilt trip. A gentle 'want to add this?' lifts orders without souring the sale. Push too hard and you risk the whole purchase you'd already won.
Offer the Thing That Completes the First Choice
An upsell feels pushy when it's random — buy a logo, get offered a diet plan. It feels like service when it completes the thing they already chose. The simple test: does the add-on make the first purchase work better, or arrive sooner? If not, leave it out.
The good ones are the buyer's next thought anyway. Someone buying a Notion template is a natural yes to "a 20-minute setup call"; a wedding booking pairs with "a second shooter for the ceremony"; a meal plan wants "the printable shopping lists." Each simply removes the next small friction the buyer was about to hit.
If you can't say in one sentence why the add-on helps the first purchase, it isn't an upsell — it's a second shop bolted onto the till, and that's the version that feels like being sold to.
One Bump, One Screen
Mechanics matter as much as the offer. Present a single add-on at checkout as a tick-box the buyer can accept without leaving the page or re-entering their card — the classic order bump. Stack three or four options and you turn a smooth purchase into a decision-heavy one, which often costs you the original sale as well.
Keep the extra cheap relative to the main item. A rough guide is a third of the base price or less, so it reads as "may as well" rather than a second big decision. A £9 add-on to a £40 order gets a shrug and a yes; a £35 add-on gets a pause and a rethink of the whole cart.
On OneSol this is one line on the same checkout, because payments land in your own Stripe — the buyer taps once and you're not left chasing a separate invoice afterwards.
Where Upsells Usually Go Wrong
Most pushy-feeling upsells fail for the same few reasons, and each is easy to check before you publish. Run your offer past the list below.
Notice that none of these are about the buyer being stingy — they're about timing, price and relevance. Fix those and the same offer stops feeling like pressure and starts feeling like help.
- Offering it before they've committed to the first thing
- Pricing the add-on close to the main item
- Stacking several options instead of one clear tick-box
- An add-on that has nothing to do with what's in the cart