The Retool alternative that brings the backend, too.
Retool builds a UI on data you already have. Snill generates the whole thing (database, app, and a REST API) from a plain-language description.
Retool is one of the best tools ever made for developers who need to ship internal software fast. If you’re an engineer with a database and a backlog of admin panels, it’s hard to beat, and its AppGen and agent work over the past year has been some of the most serious in the category.
But notice the assumption underneath all of it: you already have a backend. Retool builds on data you bring. You connect the source, and even when AppGen writes the first version for you, it writes it against your schema. You still model that data and maintain that layer. It’s the right trade when you have engineers and existing infrastructure, and a poor one when the thing you actually lack is the backend itself.
Snill brings the backend
Snill starts a step earlier. You describe your business the way you’d brief a colleague, something like “clients, projects, and invoices; a project belongs to a client; only managers can see rates”, and Snill generates the whole system: a relational data model, the app screens and dashboards, access control, business logic, and an auto-generated OpenAPI REST API. There’s no data source to connect, no SQL to write, and no backend to stand up first.
It stays developer-friendly where that counts. Every app ships a real REST API with scoped keys and webhooks, so engineers can build on top of it the same way they’d build on Retool, without assembling the backend underneath first.
What Retool gets right
Powerful and flexible
For developers, Retool is a fast way to build serious internal tools. Components, queries, and custom JavaScript give you real control over the result.
Connects to everything
Databases, REST and GraphQL APIs, SaaS tools. Retool plugs into your existing stack and lets you build on top of it.
Its AI is the real thing
AppGen generates a working, connected tool from your schema and a description, and Retool Agents and MCP support go well beyond a demo. This is not a company that stood still.
Where the model starts to strain
You bring the backend
Everything Retool does, including AppGen, starts from data you already have. Connect your own database or API, or use Retool's hosted one, and you still model that layer and own it yourself.
A developer stays in the loop
AppGen will get you a real first version without much code, and that's a genuine shift. The work around it, connecting sources, tuning queries, custom components and permissions, still lands on someone who writes SQL and JavaScript.
It's a UI layer, not a system
Retool renders interfaces over your data, and Workflows automate jobs you build. There's still no generated relational model of its own, no declarative status-workflow rules enforced on your records, and no auto-generated OpenAPI API over the app's own data. That layer is yours to bring.
Retool vs Snill
| Retool | Snill | |
|---|---|---|
| The data layer | Connect your own database or API, or Retool's hosted DB, and model it yourself. | A relational data model generated from your description, with no data source to bring. |
| How you build the UI | Generate a first version with AppGen, then drag components and write SQL or JavaScript. | Describe the app, and Snill generates the screens, forms, and dashboards. |
| Who it's for | Developers, though AppGen opens the first draft to more people. | Anyone who can describe their business, and developers get the API too. |
| Business logic | Queries, transformers, and JavaScript you write. | Calculations, workflows, and triggers you describe, enforced on the server rather than in the UI. |
| The API | You build tools against the APIs you connect. | Every app ships an auto-generated OpenAPI 3.0 REST API. |
| The AI after launch | AppGen and Agents generate and automate, aimed at the person building. | Still there once the app is live. It knows your data model, so anyone can ask it a question or ask for a change, and it proposes rather than applies. |
| Best if | You're a developer building custom UIs on existing data. | You want the whole system, data, app and API, from a description. |
Who should switch, and who shouldn't
Stay with Retool if…
You're a developer, you already have the backend and the data sources, and you want fine-grained, code-level control over bespoke internal UIs. Retool is superb at exactly that, and there's no reason to trade it away.
Try Snill if…
You don't have the backend, or don't want to build and maintain it, you'd rather describe the tool than write SQL and JavaScript for it, or you want non-developers on your team to own the app while you build on its API.
Frequently asked.
Is Snill a Retool alternative for developers?
It's a different starting point. Retool builds a UI on data you bring, and Snill generates the data model, the app, and a REST API from a plain-language description, which developers can then build on. If you were about to stand up a backend just to point Retool at it, Snill is the shortcut.
Doesn't Retool generate apps with AI now?
Yes, and it does it well. AppGen builds a working tool from your database schema and a description, connected to real data rather than a wireframe, and Retool Agents extend that further. The difference isn't whether there's AI. It's two other things. AppGen generates a tool over a schema you already own, while Snill generates the schema, the app and the API together. And Retool's AI is aimed at the person building the tool, while Snill's assistant stays inside the finished app, where it knows the data model and answers questions from whoever is using it. An ops person can ask which invoices are unpaid without building a view first.
Do I need to know SQL or JavaScript?
For Retool, usually yes once you go past the first version. It's a developer tool at heart. For Snill, no, because you describe the app in plain language. Developers can still drop down to the REST API, webhooks, and scoped keys whenever they want.
Can Snill connect to my existing database?
No. Snill generates and hosts the data model itself rather than pointing at an external database. You bring your existing data in through CSV or JSON import, and you integrate the rest through the auto-generated REST API and webhooks.
What does Snill cost?
Snill is free to start for solo operators, with a Pro plan for teams. You're paying for your Snill account, your data is yours to export anytime as CSV or JSON, and your app's full model as JSON.
Describe your business. Get a system that runs it.
No code, no devs. Start free and shape it in plain language.