The Appsmith alternative that includes the backend

TL;DR

Appsmith is an open-source platform for building internal tools: you drag widgets onto a canvas, connect them to PostgreSQL, MongoDB, MySQL, Snowflake, REST or GraphQL APIs and dozens of SaaS tools, and write JavaScript wherever you need logic. Apps live in Git, deploy through your CI pipeline and can run self-hosted or on Appsmith Cloud. What Appsmith does not give you is the backend. Appsmith stores configuration and credentials, not your data; the schema, the API, the permissions on rows and fields and the business logic still live in systems you build and run yourself. pylo is a backend platform where data model, typed API, permissions, flows, admin UI, forms, events and AI access through MCP are one system. If you already have a backend and want custom UIs on top, Appsmith is a good, open choice. If you would otherwise build a database, an API and a permission layer first, just to put Appsmith on top, pylo gives you all of it from day one.

What is pylo?

pylo is a Backend-as-a-Service platform from Germany that you can use to build the operating system for your company. You model entities, fields and relations in the admin panel or through the API, and pylo generates a typed GraphQL API immediately. The same permission model governs data, the admin UI, forms, flows, dashboards and the MCP server. With pylo flows you build automations on top of your own data model and connect the tools you already use. The admin UI, forms and document templates mean operations teams work with the data without a developer in between, and the Next.js, React, Node and Expo SDKs are there for the apps you build yourself.

What is Appsmith?

Appsmith is an open-source low-code platform for internal tools and custom apps on top of existing data. You build UIs from drag-and-drop widgets or custom widgets written in JavaScript, HTML and CSS, connect them to databases such as PostgreSQL, MySQL, MSSQL, MongoDB, Redis, Snowflake, Oracle and DynamoDB, to REST and GraphQL APIs and to SaaS tools like Salesforce, HubSpot, Stripe, Airtable and Google Sheets, and write JavaScript in a central IDE with autocomplete and debugging. Git sync gives you branches for dev, staging and production, pull request review and CI/CD. Business adds workflows, custom roles, audit logs and premium integrations; Enterprise adds SAML and OIDC SSO, SCIM provisioning and air-gapped deployment. Appsmith Cloud runs on AWS and acts as a proxy that does not store the data your queries return.

At a glance

A backend with an admin UI instead of a UI without a backend

Appsmith is built to sit on top of data that already lives somewhere else. That is its biggest strength when the backend exists and its biggest gap when it does not: someone has to design the schema, write the migrations, build and host the API and the auth and keep all of it running before the first Appsmith app makes sense. Appsmith has no database of its own; it is a proxy to yours.

In pylo you add an entity, a field or a relation in the admin panel and the typed GraphQL API updates at once, without migrations or redeployments. Field types include relations, enums, JSON, public or private files, rich text, dates, booleans and number and text formatters, with validation built in. Relations work across your whole workspace, you filter across them and group aggregations by any field, and API requests are unlimited on every plan. The admin UI, forms and flows work on that same model from the start, so there is nothing to wire up between a database and a UI layer, and the backend is built to handle millions of records.

Permissions that follow the data everywhere

Appsmith controls who can open and edit which app and workspace. Free has three standard roles, Business adds custom roles and groups, and Enterprise adds SCIM. What a user may see inside the data is up to your queries: you filter rows with the current user's details in each query, and there are no field-level permissions on the data itself. Every new query is one more place where a filter can be missing. Fine for a handful of admins, risky when many roles work on the same records.

pylo separates tenants at the row level. Inside a tenant, any entity can act as the requester (ARO) and any entity as the requested object (ACO), with hierarchies and field-level rules. The permissions live in the data layer, not in the queries, and every path into the data is GraphQL, so the same rules apply to the API, the admin panel, forms, flows, dashboards and MCP. pylo also handles login for the people who use your apps, with email and password, Microsoft and Google SSO and API keys, on every plan.

pylo flows instead of workflows behind a paywall

Appsmith's JavaScript is one of its best features: transform data, chain queries and script behaviour in a proper IDE. Scheduled or event-driven jobs are a separate workflows feature on Business and Enterprise, and since Appsmith does not own the data, a change made in your database does not trigger anything in Appsmith by itself.

In pylo you build automations in a visual workflow engine called pylo flows. Any event on your data can start a flow the moment it happens, whether it came from the admin UI, a form, the API or another flow, and so can a cron schedule or an incoming webhook. Flows include retries, custom rate limiting, error handling and full event logs, everything is statically typed, and pylo ships integrations for email sending and a range of third-party systems. For anything else you write a flow action in TypeScript. Flows are on every plan, including the free one.

Admin views and forms built on the same permissions

Appsmith's canvas is one of the most flexible ways to build internal UIs, and we won't pretend otherwise: widgets, custom widgets in JS, HTML and CSS, Git branches and a copilot that writes code. Every screen is still something a developer builds and maintains, and when the schema changes, the apps change with it. pylo's admin UI has a different focus. It is there from the moment you create an entity: you compose list and detail views from predefined components, decide who sees what and show or hide fields depending on a record's state. The views use the same permission model as the API, so nobody sees data through a view that they could not read anyway.

pylo forms are public or authenticated web forms with hidden fields, conditional rendering, validation rules and direct mapping to your entities, including relations, with several instances per form and a matching key that updates existing records. For screens that need a fully custom UI, build your own app on the Next.js SDK with the same permissions, or keep Appsmith and point it at pylo's API.

Events and dashboards built in with pylo analytics

In Appsmith you build charts into your apps from whatever your queries return, and Business adds audit logs of what users did in Appsmith. Tracking how your business data changed over time means building audit tables and triggers in your own database. Every create, update and delete in pylo emits an event with the full before and after state, which you can combine with external events you bring in through the API. You build dashboards on records and events together, with the same permissions as the rest of pylo.

AI and MCP with guardrails

Appsmith's copilot generates widgets and workflow code from a prompt, and apps can call OpenAI, Anthropic and Google AI directly. pylo's MCP server is ready to connect, for developers who use agentic coding and for team members who want to ask questions about their records from Claude, ChatGPT or any other client. The AI gets exactly the connected user's read permissions, nothing else. pylo never applies an AI's writes directly: they arrive as proposals that a human accepts or declines inside pylo.

Pricing

Appsmith's Community Edition is free if you host it yourself, and the cloud Free plan covers a small team. Past five users every person who opens an app is a seat: 50 people on Business cost $750 a month, and that is before the database, the API and the hosting underneath, which Appsmith does not include. pylo bills per workspace with unlimited users, and every plan includes the backend, flows, the admin UI, forms, analytics and personal onboarding. Plans differ only in included usage for records, flow actions and file storage.

Hosting, compliance and reliability

All pylo content data, data models and databases live in data centres in Germany. Our subprocessor list is public and names every non-EU parent company openly. A GDPR data processing agreement is part of the terms, and we never use customer data to train AI models. Paid plans come with a 99.5% availability SLA, hourly encrypted backups kept for 30 days at a separate German location, and support from the team that builds the product.

Appsmith Cloud runs on AWS data centres with SOC 1 and SOC 2 standards and Appsmith cites SOC 2 Type II for itself. Because Appsmith only proxies your queries, your business data stays in the databases you connect, and where it lives is up to you. Self-hosted Appsmith runs wherever you put it, including air-gapped on Enterprise, which also means updates, backups and uptime are your job.

Where Appsmith is the better choice

We would rather tell you than have you find out later:

• You already have a solid backend with its own API and permissions, and you need custom UIs on top of it.

• You want open source and self-hosting, including air-gapped deployments.

• Your developers want JavaScript everywhere, custom widgets in HTML and CSS, Git branches and pull request review for every app.

• You need to pull data from many SaaS tools into one screen, from Salesforce and HubSpot to Jira and Zendesk, with ready-made integrations.

If you have the backend and need the screens, Appsmith is a strong, open choice. pylo is for teams that would otherwise have to build the backend first.

Where pylo is a great Appsmith alternative

We think these are the main reasons to pick pylo over Appsmith:

• The backend is included. Data model, typed API, permissions, flows, admin views, forms, events and MCP are one product, so there is nothing to build and host before the first screen.

• Unlimited users on every plan. The whole company, suppliers and customers work with the data without a seat per user.

• Schema changes without a rebuild. Add an entity, field or relation and the API and admin views are live immediately.

• Permissions in the data layer, down to the field. One rule set for API, admin UI, forms, flows, dashboards and MCP, instead of a filter in every query.

• Login for your own users. Email/password, Microsoft and Google SSO and API keys, for internal and external users alike, on the free plan too.

• Flows on your own data, on every plan. Event, cron and webhook triggers with retries, rate limiting, typed actions and full logs, and custom actions in plain TypeScript.

• Forms built on your data model. Mapped to entities and relations, with several instances per form and a matching key that updates existing records.

• Analytics you don't have to instrument. Every change is an event with before and after state, and dashboards sit next to the data.

• AI access that's safe for production. MCP runs with the connected user's exact read permissions, and every write goes through human approval as a proposal.

• German hosting from a German company. pylo hosts every record, file and event in Germany on every plan and the DPA is part of the terms. You get a 99.5% SLA from the first paid plan, hourly backups with 30-day retention and personal support from the people who build the product.

FAQs - Questions and answers about pylo

• Can I use Appsmith on top of pylo? Yes, Appsmith has a GraphQL data source, so you can connect it to pylo's typed GraphQL API with an API key whose permissions you define in pylo. Many teams use pylo's admin UI for the back office and keep Appsmith for a few highly custom screens.

• Is pylo open source like Appsmith? No, but you can export all data at any time as CSV or JSON or through the API. The data models, flow definitions and generated SDK code are yours to keep, even after you leave.

• Can I self-host pylo? pylo is a hosted platform. Every plan, including the free one, runs in data centres in Germany, with backups, updates and monitoring done by us.

• Does pylo have a drag-and-drop canvas? pylo's admin UI is configured, not drawn: you compose list and detail views from predefined components and decide who sees what. For a fully custom UI you build on the Next.js SDK or the typed GraphQL API, which an AI coding assistant can do quickly because the API is fully typed.

• Where exactly is my data? Content data is in data centres in Germany and backups are kept at a different German location.

• Can I get access now? pylo is currently in private beta. Request access and we will set up your first entities with you on a call and onboard you personally for your first project.