Kubbler vs Bolt: from prototype to product.
Bolt spins up a full environment in the browser and generates the whole application. Kubbler composes the product layer on top of a foundation written by engineers. The first is unbeatable for trying things; here is what the second changes when it is time to ship.
- capabilities written by engineers, never generated
- 22capabilities written by engineers, never generated
- tokens spent on the size of your project
- 0tokens spent on the size of your project
- monthly subscription, hosting included
- 1monthly subscription, hosting included
Which of the two, for you.
Bolt
You are prototyping, and you want the shortest path between an idea and something that runs. Bolt opens a full environment in the browser in seconds, imports a Figma file or a repository, accepts any library, and lets you throw the result away without regret. For exploring, we do not claim to do better.
Kubbler
The prototype has to become the product, and somebody is going to pay inside it. Accounts, payments, emails, backups and deployment are not there to be generated: they are written, tested and operated by engineers, identical for every project. You keep the speed of the prompt and you lose the wall at shipping time.
Line by line, no corners rounded off.
Every line about the other product comes from its own public documentation. The two lines where it beats us are in the table, not buried further down.
Comparison checked on 10 September 2026 against the vendor's public documentation. These products move fast: if a line is wrong, write to us and we will fix it.See the source
The three differences that matter.
Three gaps that are not a matter of settings, but of what each product is trying to do.
The foundations never go through the model
Bolt generates the whole application, accounts and payments included, in an environment that lives in your browser. That is exactly what makes it so fast to try. Here that layer is never generated: it is written once, reviewed, run in production, and shared by every project.
Accounts, two-factor authentication, roles and abuse quotas: the same code for everyone.
Stripe payments: one-off, subscriptions, failed charges and invoices, on your own account.
A fix in the platform reaches every customer the same day, with nobody re-prompting anything.
The cost of a message should not grow with the project
Bolt says it themselves: tokens go first to syncing the project's file system to the model, so the larger the project, the more each message costs. That is the logical consequence of generating everything. Here the foundation is not in the loop: there is nothing to re-sync as the application grows.
A monthly subscription: hosting, certificate and backups included.
No commission on what you take in, payments run through your own Stripe account.
The price of a change depends neither on the number of files nor on the age of the project.
What you take with you, and what you leave
On this point Bolt is ahead, and it should be said: you download the project as an archive, open it in your editor, host it wherever you want, and nothing holds you back. On our side the code of your product exports to GitHub, but the foundation stays operated by us.
Your product exports at any time: conventional JavaScript any developer can read.
The platform itself stays with us. That is the price of having it run and fixed for every project at once.
Worth noting on their side: on the free plan, published sites carry Bolt branding, and custom domains start at the paid plan.
The questions we get asked.
Precise answers, including the ones that do not favour us.
Not with a button, and nobody should promise you otherwise. What carries over quickly is the intent: you describe the product you have just prototyped, the AI recomposes it on the platform, and you get accounts, payments and emails without rewriting them. The code Bolt generated does not transplant: it does not sit on the same foundations.
For a prototype, almost always: the free plan is often enough to find out whether the idea holds. For an application you maintain, the comparison flips, because token consumption follows the size of the project while our subscription does not move. Compare over twelve months, not over one evening.
A real one, and we do not have it: a full environment in seconds, nothing to install, any library you like. That is precisely what exploring needs. Our bet is different: what you compose runs from the start on the infrastructure that will serve it in production, with its accounts, its database and its backups.
No, and that is the honest trade-off of a foundation. We cover what 22 capabilities and 81 interface blocks carry: accounts, payments, subscriptions, data, files, booking, blog, translations, deployment. That is wide, it is not infinite. Outside that frame you have to write code, or ask us. Bolt does not have that limit, and it does not have our foundations either.
With us, what you publish lives on your own domain, unbranded, from the beta onwards. With them, check the terms of the plan you are on: on the free plan, published sites carry Bolt branding and custom domains start at the paid plan.
With us: in Paris, at Scaleway, one dedicated database per project, isolated from the others, with automatic backups and a DPA available. For Bolt, refer to their documentation and to that of the services you wire into the project.
Prototype wherever you like. Ship here.
Free during the beta, no card required. Take the idea you have just tried, describe it, and see what is actually left to do to put it online.