A PRIVATE AI ASSISTANT FOR IPHONE
vesper.
A mind that lives on your phone rather than in somebody's data centre.
The models run on the phone itself. There is no account to make, no subscription to cancel, and no server to send anything to — because there is no server. One payment, and then it's yours.
One payment. Not a subscription.
NO SIGN-UP · NOTHING LEAVES YOUR PHONE · RUNS ON-DEVICE
THE WHOLE IDEA
The difference isn't local or remote. It's whose device.
ChatGPT and Claude aren't streaming a model to you. They're terminals. Your text goes over the network, the thinking happens on someone else's silicon, and the words come back. The model never moves.
So on-device AI isn't a lesser category of the same thing. It's the same thing with the hardware relocated — into your pocket, where you already own it. Everything else on this page follows from that one relocation.
Five things that are true of Vesper and can't be true of a cloud assistant.
Nothing leaves the phone.
Not a privacy policy — an architectural fact. There is nowhere to send it. Every competitor can promise good behaviour, but the words still cross the network to get answered.
No account.
Open it and use it. No email, no phone number, no verification. There's no identity to attach a conversation to, because there's no identity at all.
It works with no connection.
Flights, subways, tunnels, ships, rural roads, a country you haven't bought roaming for. An assistant that works when the network doesn't is a different product from one that doesn't.
One payment.
$49.99 once, against $20 a month forever. It pays for itself in ten weeks, and over three years the comparison is $49.99 to $720.
It survives us.
If this company shuts down tomorrow, Vesper keeps working. It doesn't call home and it doesn't check a licence server. Every subscription dies with its provider; this one never needed us.