Slim
Hosting
Install Slim in one click on our fast, reliable UK web hosting. Fully managed with free SSL, daily backups, and dedicated expert support.
What is Slim?
Slim is a free, open-source PHP micro-framework first released in 2011 by Josh Lockhart. Licensed under the MIT licence, it provides a minimal foundation for building web applications and APIs with a small surface area: routing, request and response handling via PSR-7 interfaces, middleware, and a dependency container. Slim 4 (the current major version line) is fully PSR-15 compliant and works alongside any PSR-compatible HTTP message library, container, and middleware.
Slim deliberately does not bundle an ORM, templating engine, authentication system, or front-end build tooling. It is meant as a small core that developers compose with their preferred libraries: Eloquent or Doctrine for data, Twig or Plates for templates, league/oauth2-server for auth, and so on. This makes Slim popular for REST APIs, micro-services, webhook endpoints, lightweight admin panels, and prototypes.
The framework runs on any standard PHP environment and is available through Composer. The 365i one-click installer includes a Slim starter for developers who want a fast way to put a Slim project on shared hosting without setting up the boilerplate themselves.
365i’s editorial review of Slim
Slim is genuinely my favourite PHP framework for the kind of project where Laravel or Symfony would be a sledgehammer. Most of what gets built on the web isn\'t a full enterprise application. It\'s a webhook receiver, a small JSON API for a single mobile app, an internal admin tool with three pages, a microservice that does one thing. Slim is excellent for all of those, and it stays out of your way while you build them.
What I love about Slim: the routing is clean, the middleware system is sensible, the PSR-7 request and response objects mean my Slim code can talk to any PSR-compatible library without contortions, and the codebase is small enough that I can read it end to end on a quiet afternoon. There\'s no magic. There\'s no hidden lifecycle. The route handler runs, middleware wraps it, the response goes back. That\'s the whole story.
What\'s annoying is the same thing that\'s good about it: Slim doesn\'t come with much. If you want auth, you wire it up. If you want a database, you wire it up. If you want sessions, templates, validation, mailers, queue workers, you wire those up too. For a developer comfortable with Composer and PSR conventions, that\'s liberating. For a developer who wants batteries included, that\'s a list of decisions they didn\'t want to make. Laravel exists for a reason.
"If your project fits on the back of a postcard, Slim is probably the right framework. If your project needs an admin panel, role-based permissions, user management, queues, mailers, file storage abstraction, and a CLI from day one, use Laravel and don\'t pretend otherwise."
Mark McNeece, Founder, 365i Hosting
From a hosting perspective, Slim is one of the most well-behaved PHP applications we host. Memory footprint is tiny, request handling is fast, and the framework doesn\'t do anything weird that conflicts with mod_php or PHP-FPM. Our shared hosting at £5.99/mo handles small to medium Slim projects beautifully. PHP ' . PHP_VERSION_LATEST . ', MySQL 8, 256MB memory, and our autoscaling cloud platform with unlimited LVE resources cover most use cases. For higher-traffic APIs, particularly webhook receivers handling sustained inbound bursts, our cloud hosting at £9.99/mo gives you dedicated resources and the kind of headroom that matters when a popular partner sends you 5000 webhooks in a minute.
One technical note: Slim projects rely on .htaccess (Apache) or the equivalent rewrite rules on Nginx to route everything through public/index.php. Our default Apache configuration handles this correctly out of the box, and the one-click Slim starter ships with a working .htaccess. If you\'re uploading a custom Slim project from elsewhere, double-check that the .htaccess in your public/ directory survived the upload, that\'s usually the cause of the "everything 404s" issue people hit on first deploy.
Composer is available on our shared hosting via SSH for plans that include it, and we provide a vendor/ folder upload path for those who prefer to build locally and ship the result. Either approach works. We can advise on which approach suits your specific project and your specific deployment workflow.
Why Host Slim with 365i?
Our web hosting is built for PHP applications like Slim. Every plan includes everything you need to launch and grow.
One-Click Installation
Install Slim with a single click from your control panel. No manual configuration, no FTP uploads, no database setup.
Free SSL Certificate
Every site gets a free SSL certificate, automatically configured and renewed. Keep your Slim installation secure from day one.
99.9%+ Uptime Track Record
Enterprise-grade data centres in the UK, US & Asia with redundant power, cooling, and network connectivity. Shared hosting runs on autoscaling cloud infrastructure with a 99.9%+ historical uptime record; Managed Cloud Servers target 99.99% uptime; our VPS products carry a contractual 99.99% network availability SLA with service credits.
Daily Backups
Automatic daily backups with easy one-click restore. Your Slim data is always safe and recoverable.
7-Day Expert Support
UK-based hosting specialists available 7 days a week including evenings, weekends, and bank holidays. Real people, real help.
SSD Storage
All plans run on fast SSD storage for snappy page loads and responsive admin panels. Slim performs at its best.
Where Slim Fits
Best for
PHP developers building REST APIs, JSON micro-services, webhook receivers, small admin tools, and prototypes who want a small, fast, no-magic framework they can read end-to-end. Anyone who finds Laravel and Symfony heavyweight for what they're building and wants to assemble exactly the libraries they need.
Watch for
No batteries included. Authentication, ORM, templating, sessions, validation, queues, and mailers all need to be wired up by you. Slim is not the right choice for a developer who wants framework-level scaffolding, generators, and a starter admin panel. Application-level upgrade work between major Slim versions can be non-trivial.
Web Hosting for Slim
Get Slim up and running in minutes with our fast, reliable web hosting. Every plan includes one-click installation, free SSL, UK, US & Asia data centres, and dedicated expert support.
- 1 website
- 10 GB SSD storage
- Free SSL certificate
- 80+ 1-click installs
- Unlimited LVE resources
- Autoscaling cloud platform
- UK, US & Asia data centres
- 5 websites
- Unlimited SSD storage
- Free SSL certificate
- 80+ 1-click installs
- CDN included
- Unlimited LVE resources
- Autoscaling cloud platform
- UK, US & Asia data centres
- 10 websites
- Unlimited SSD storage
- Free SSL certificate
- 80+ 1-click installs
- CDN included
- Timeline Backup/Restore
- Unlimited LVE resources
- Autoscaling cloud platform
- UK, US & Asia data centres
All prices exclude VAT. No contract, cancel any time.
Need More Power for Slim?
For high-traffic sites, large catalogues, or mission-critical deployments, our fully managed cloud servers give Slim dedicated resources and enterprise-grade performance.
- Dedicated CPU, RAM & SSD storage
- 99.99% uptime
- Fully managed by our team
- Choose 365i, AWS, or Google Cloud
A Slim case from our books
A small fintech consultancy in central London joined us in 2025 with a Slim 4 webhook-receiver project they\'d been running on a London VPS at around £45/mo. The application takes inbound webhooks from a payments partner, normalises the data, drops it onto a Redis queue (replaced with database polling for the migrated environment), and pushes notifications to their internal Slack. Volume averages around 28,000 webhooks/day with bursts of 3,500/minute when the partner reconciles end-of-day batches.
We moved them to our cloud hosting at £9.99/mo, set up PHP 8.3 with appropriate FPM tuning for their burst pattern, configured an .htaccess that handled the inbound POST routing cleanly, and worked with their developer to swap Redis for a small MySQL queue table since they didn\'t need the speed for this volume. Daily backups, free SSL across the API hostname, and basic monitoring of the queue table backlog were included.
End-to-end the migration took about six working hours of our time, plus a couple of hours of their developer\'s. Hosting cost dropped from £540/yr to £120/yr, response times improved by roughly 22%, and the sustained-burst test passed comfortably.
What we would tell anyone in the same spot: a Slim API rarely needs a VPS. Properly tuned shared or cloud is usually plenty, and the cost difference adds up.
Anonymised at the client's request. Industry, scale, and timeline preserved.
What we look for in php frameworks hosting
Hosting a PHP framework well is mostly about the things people forget to check until something breaks: SSH access, Composer, cron, environment variable handling, and a sane document-root setup that points at the framework's public/ subdirectory rather than the project root. We give all of that on every plan with PHP 8.5, modern extensions, and a real shell, so framework deployments behave the way framework documentation expects.
Slim Hosting FAQ
Common questions we hear from people running Slim on our hosting.
Slim 4 needs PHP 7.4 or later (PHP 8.x is fully supported and what we run by default). It needs URL rewriting (mod_rewrite on Apache, equivalent on Nginx) to route requests through public/index.php. Our shared hosting includes PHP 8.5, mod_rewrite, Composer access on SSH-enabled plans, and 256MB PHP memory. Slim itself uses very little memory. We've hosted Slim projects across the full range of our plans without specialist server configuration.
Yes, our one-click installer drops a Slim 4 starter project in place with a working .htaccess, a sample route, and a vendor/ directory ready to extend. From there you'll add your own routes, middleware, and integrations. The starter is intentionally minimal because Slim is intentionally minimal. If you're uploading an existing Slim project from your local development environment, that's also fine, FTP or SSH the files in and check the .htaccess survived.
Yes, Slim is well-suited to API workloads and our autoscaling cloud platform with unlimited LVE resources handles bursts comfortably. For sustained high-volume APIs (above several hundred requests per second average), we'd recommend our cloud hosting at £9.99/mo for dedicated resources and consistent latency. Slim itself is not the bottleneck in almost any realistic scenario, the bottleneck is usually the database or external service calls inside your route handlers. We can advise on caching and queue strategies.
We support the hosting layer 7 days a week, evenings and weekends included. PHP, mod_rewrite, .htaccess, MySQL, Composer access, SSH, SSL, cron, and migrations are all in scope. We don't debug Slim application code, design your route structure, or write middleware for you, that's development work. Our sister site 365iwebdesign.co.uk can quote for application-level work. The official Slim documentation at slimframework.com is excellent and the GitHub Discussions are active. Datacentre infrastructure is monitored 24/7.
Yes, free of charge. Send us your existing host's FTP or SSH details and your project structure and we'll move it across, set up the .htaccess, configure SSL, run composer install if applicable, and test a sample of your routes before cutting DNS over. If you're moving from a VPS or cloud provider with environment-specific config (e.g. .env values, database credentials, queue connections), we'll work with you to update those for our hosting environment. Migration is included in standard support.
Ready to Host Slim?
Get started with Slim on our fast UK web hosting. One-click installation, free SSL, and dedicated expert support included.