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Web Development · head to head

FastAPI vs Xlinesoft

FastAPI logo

FastAPI

Web Development

A modern, fast, high-performance web framework for building APIs with Python

From
Free
Free plan
Yes
Full reviewWebsite
Xlinesoft logo

Xlinesoft

Developer Tools

PHPRunner and ASPRunner.NET: low-code builders that turn databases into web apps

From
$599/one-time
Free plan
No
Full reviewWebsite

The short version

  • Only FastAPI has a free tier, so it costs nothing to try first.
  • Each has a real cost: FastAPI no built-in ORM, requires separate database libraries; Xlinesoft the purchase includes one year of support and upgrades only; after that, newer versions require a paid upgrade.
  • Prices and features above were last checked on 12 November 2026.

Where they differ

Only the attributes on which FastAPI and Xlinesoft actually diverge.

Attributes where FastAPI and Xlinesoft differ
AttributeFastAPIXlinesoft
Starting priceFree$599/one-time
Pricing modelopen-sourceone-time
Free tierYesNo
PlatformsWebWindows, macOS, Linux, Web
CategoryWeb DevelopmentDeveloper Tools

Identical on both: user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in FastAPI

Nothing recorded that Xlinesoft does not also cover.

Only in Xlinesoft

  • Database to web application
  • Page Designer and themes
  • Events, custom code and AI assistance
  • Security and dynamic permissions
  • Reports, charts and dashboards
  • Wide database support
  • Enterprise authentication
  • Application templates and plugins

What people use each for

The jobs each tool is most often brought in to do.

FastAPI

  • Building production-ready REST APIs with automatic validationnot Xlinesoft
  • Serving machine learning model predictions as REST servicesnot Xlinesoft
  • Building crisis management and orchestration platformsnot Xlinesoft
  • Enabling real-time APIs with WebSocket connectionsnot Xlinesoft
  • Rapid API development reducing boilerplate code significantlynot Xlinesoft

Xlinesoft

  • Building an internal web application on top of an existing SQL databasenot FastAPI
  • Replacing a Microsoft Access application with a browser-based onenot FastAPI
  • Creating admin interfaces and customer or partner portals with role-based accessnot FastAPI
  • Agencies and freelancers delivering self-hosted database applications to clientsnot FastAPI
  • Teams that need low-code tooling but must keep applications on their own serversnot FastAPI

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

FastAPI

  • No built-in ORM, requires separate database libraries
  • Python-only, cannot build with other languages
  • Async/await learning curve for developers new to async programming
  • Production deployment requires separate ASGI server configuration

Xlinesoft

  • The purchase includes one year of support and upgrades only; after that, newer versions require a paid upgrade.
  • Multiple database connections, REST API connections and single sign-on through Active Directory, Okta or SAML are Enterprise-only, which raises the price from $599 to $999 per developer.
  • Self-hosted only. Hosting, database administration, backups, runtime updates and access-control configuration remain the customer's job, as Xlinesoft's own product facts page states.
  • Applications built on Microsoft Access require a Windows web server.
  • PHPRunner and ASPRunner.NET are separate products with separate licences, so moving a project between PHP and .NET is not covered by one purchase.

Pricing, plan by plan

FastAPI

Free

No published plan breakdown. See the FastAPI review.

Xlinesoft

$599/one-time
  • PHPRunner Professional$599/one-time
    • Single developer licence
    • Core application-building product
    • One year of email support and upgrades
  • PHPRunner Enterprise Edition$999/one-time
    • Single developer licence
    • Multiple database and REST API connections
    • Data encryption
  • PHPRunner MultiDev Edition$3599/one-time
    • Three Enterprise Edition licences
    • Multiple developers working on the same project at the same time
    • One year of email support and upgrades
  • ASPRunner.NET Professional$599/one-time
    • Generates ASP.NET web applications
    • Same database coverage and security model as PHPRunner
    • Enterprise Edition available

Which should you pick?

Choose FastAPI if

  • You want to start without paying.
FastAPI review

Choose Xlinesoft if

  • You need database to web application.
  • You work on Windows, macOS, Linux, Web.
  • You also want page designer and themes.
Xlinesoft review

Questions people ask

Is FastAPI or Xlinesoft better?
Neither clearly leads. FastAPI starts at Free and Xlinesoft at $599/one-time, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, FastAPI or Xlinesoft?
FastAPI has a free tier; the other does not. Paid plans start at Free for FastAPI and $599/one-time for Xlinesoft.
Does FastAPI or Xlinesoft run on more platforms?
FastAPI runs on Web. Xlinesoft runs on Windows, macOS, Linux, Web.
Can I use FastAPI for free?
Yes. FastAPI has a free tier, so you can try it without paying. Xlinesoft starts at $599/one-time.
What is FastAPI best used for?
FastAPI is most often used for building production-ready rest apis with automatic validation, serving machine learning model predictions as rest services, building crisis management and orchestration platforms, enabling real-time apis with websocket connections. Of those, building production-ready rest apis with automatic validation and serving machine learning model predictions as rest services are not what Xlinesoft is typically brought in for.
What can FastAPI do that Xlinesoft cannot?
Xlinesoft covers Database to web application, Page Designer and themes, Events, custom code and AI assistance, Security and dynamic permissions.

Answered from the vendors’ own pages

FastAPI: Is FastAPI free to use?

Yes. FastAPI is free and open-source under the MIT License. It costs nothing to download, use, or deploy in production. An optional paid service, FastAPI Cloud, offers one-command deployment for additional convenience, but the core framework is free.

Source
Xlinesoft: How much does PHPRunner cost?

PHPRunner Professional is $599, Enterprise Edition is $999 and MultiDev Edition, which includes three Enterprise licences, is $3,599. Professional and Enterprise prices are per developer, and each purchase includes one year of email support and free upgrades.

Source
FastAPI: Can I use FastAPI for commercial applications?

Yes. FastAPI's MIT License permits unrestricted commercial use, modification, and distribution. You can build and sell products powered by FastAPI without licensing fees or restrictions.

Source
Xlinesoft: Which databases does PHPRunner support?

MySQL, MariaDB, Microsoft SQL Server, PostgreSQL, Oracle, Microsoft Access, IBM DB2, Informix, SQLite and ODBC-compatible databases. Using multiple database connections in one project is an Enterprise Edition feature.

Source
FastAPI: Does FastAPI include a database or ORM?

No. FastAPI does not include a built-in database or ORM. You must add separate libraries like SQLAlchemy for database access. This gives flexibility to choose the database solution best suited to your project.

Source
Xlinesoft: Is there a free trial?

Yes. PHPRunner can be downloaded and evaluated for 21 days, and public live demos show the generated applications, with add, edit and delete disabled.

Source
FastAPI: What Python versions does FastAPI support?

FastAPI supports Python 3.7 and later. Older Python versions are not compatible, so you must run at least Python 3.7 to use FastAPI.

Source
Xlinesoft: Where do PHPRunner applications run?

On your own web server. The documented options are Apache and Microsoft IIS with a compatible PHP runtime and database extensions, and a built-in web server is available for local testing. The development application itself runs on Windows, macOS and Linux.

Source
Xlinesoft: What does the Enterprise Edition add?

Multiple database and REST API connections, data encryption, and enterprise authentication including Active Directory, Okta, Azure AD, OpenID and SAML, on top of all Professional features.

Source
Xlinesoft: What is ASPRunner.NET?

Xlinesoft's equivalent builder for ASP.NET. It generates database-driven ASP.NET web applications with the same kind of forms, reports, charts, permissions and Page Designer, and is sold separately from $599.

Source
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