Moving subscriptions to a new Stripe price is easy. Doing it without silently overcharging trialing members, dropping someone's coupon, or misdating every customer notification email is where scripts go to die.
Migrate Pro handles the subscription states that only show up at scale. The preview is free, test mode is free end to end, and if the migration doesn't complete cleanly you get your money back.
A migration that works costs you an afternoon either way, script or tool.
A migration that silently drops a discount or bills two hundred trialing members costs you a client relationship. And you find out days later, from them, after the invoices went out.
$399/year is the price of never having that conversation.
Each one bills a real customer the wrong amount, or tells them the wrong date, and looks fine until they tell you.
Scheduling a price change on a trialing subscription can end the trial and invoice the customer on the spot, the exact opposite of "at the next renewal." On membership sites this isn't an edge case: Paid Memberships Pro starts initial payments as trials, so "trialing" can be most of the member list.
Replacing schedule phases drops a subscriber's discount unless you echo it back, and the discount vanishes the moment the schedule is created, not at renewal. Worse, carrying a coupon forward with the wrong key restarts its clock: a "50% off for 3 months" discount quietly becomes 3 fresh months of half revenue.
Push a change out by one cycle with the obvious implementation and partial billing periods overshoot the date. We measured one landing 25 days late. Nobody is overcharged, but every change date you exported for the client's notification emails is wrong, on the feature whose entire purpose is sending the right date.
Rate limits, so you need backoff. Backoff, so you need resumability, because a run that dies at subscriber 380 must not re-process the first 379. Per-subscription results, because "it failed" is not something you can tell a client. Schedules somebody else created. Metered prices. And the 11pm call where the client changes their mind and you need to undo it.
The mechanism behind each one is in Should you write your own Stripe price migration script?
For one account with fifty subscriptions, no trials, no coupons: write the script.
It's an afternoon, and anyone selling you a tool for that job is selling you something.
Buy Migrate Pro when any of this is true: it's a client's account rather than your own, the platform created the subscriptions so you didn't choose their states, the list is too big to check by hand, or someone other than you will have to explain the wrong invoice to a customer.
Connect, preview the MRR impact and the customer list, and compare it against your own script on real subscription states before you decide.
Rather not run it yourself? There's a done-for-you option where we run the migration for you.
The preview and test mode are free, so you can see exactly what it would do before paying anything.
Try it free with a Stripe test key