LinqSender sells lifetime plans: one payment in USD for the plan you choose, kept for as long as LinqSender runs, with every update to that plan. There is no subscription and nothing renews. Moving to a higher plan costs the difference in price at the time.
Every plan can be tried free for 14 days without a card. When the trial ends, campaigns stop sending and your data is kept. One trial per LinkedIn account.
Any payment can be refunded in full within 14 days of making it, from the Billing page, without conditions on how much you used the plan. Refunding your first payment ends the plan; refunding a move-up payment returns you to the plan you had before. Your data is kept.
The full terms are in the app at /terms.