Why You Need a List of Free Developer Resources
Anyone with technical experience knows that there are countless pitfalls to navigate from the moment a project is approved until it goes live. Domain registration, server setup, database configuration, email delivery, log monitoring… every step comes with hidden costs. I’ve seen plenty of independent developers and startup teams who’ve spent several thousand yuan just on tool fees before their projects even started turning a profit. In reality, many basic services offer generous free quotas—it’s just that the information is scattered, and no one has compiled it all in one place for you.
In this post, I’ve compiled a list of the truly reliable free developer tools I’ve actually used over the past few years. This isn’t just some copy-and-paste list—I’ve personally tested each one, and I’m still using some of them today. I’ll specify the exact limits of the free plans and point out the pitfalls behind those ”free” offers.
Cloud Services and Hosted Platforms
If you just want to deploy a personal project or build a prototype, there’s absolutely no need to start by buying AWS. The free tiers offered by these platforms are more than enough to get your MVP up and running.
Cloudflare Pages: This is the static site hosting service I currently rely on the most. It has no limits on the number of requests or bandwidth, and each build takes only a few dozen seconds. I’ve had a front-end project deployed there for nearly two years now, and it hasn’t cost me a single penny. Custom domains and HTTPS certificates are all automatically configured, so there’s basically no hassle. Its accompanying Workers feature also provides 100,000 free requests per day, which is more than enough for writing simple API endpoints.
Vercel: The perfect partner for Next.js projects, offering an incredibly smooth deployment experience. The free plan supports 100 GB of monthly traffic and can even be used for commercial projects (not the Team plan). However, keep in mind that its Serverless Functions have execution time limits on the free plan; if you run computationally intensive tasks, you may trigger a timeout.
Fly.io: If you want to run backend services, Fly.io provides each account with three virtual machines (256MB of RAM) sharing a single CPU, free of charge forever. I’ve used it to deploy a web crawler written in Go, and it ran for half a year without any issues. However, 256MB of RAM is indeed tight; if your application is memory-intensive, you’ll need to consider upgrading.
Oracle Cloud Always Free: It’s so generous that you might wonder if they’re just burning money to attract customers. It offers two AMD virtual machines (1 GB of RAM each) plus one ARM virtual machine (24 GB of RAM), all permanently free. The ARM VM is quite powerful—it can even run databases without any issues. The downside is that the registration review process is fairly strict; many users have had their accounts revoked without explanation after signing up. We recommend registering with a clean IP address and using your real information.
Databases and Storage
Databases are often the most cost-sensitive component of the free tier, but there are still a few good options available.
Supabase: An open-source alternative to Firebase; the free plan includes 500 MB of database storage, 1 GB of file storage, and authentication for 50,000 monthly active users. A friend of mine used it to set up a complete system for user registration, login, and data storage—it’s more than enough for small-scale projects. It’s based on PostgreSQL, so you can apply your existing SQL skills directly.
PlanetScale: MySQL Branch Database; the free version supports 5 GB of storage and 1 billion rows read per month. Its branching feature is particularly useful—you can create a branch from the production database, run migration tests on that branch, and merge it back into the main branch once you’ve confirmed everything works. This workflow is very similar to Git, which makes the fear of modifying database structures much less daunting.
Cloudflare R2: Object storage service; the free tier provides 10 GB of storage space. Its biggest selling point is zero egress data transfer fees—you don’t have to pay data transfer fees when retrieving data stored in R2. For image hosting sites or file download sites, this feature alone can save a significant amount of money. For my image hosting project, storage costs dropped to zero after migrating from S3 to R2.
Email and Push Notifications
After the project went live, features like registration verification emails and push notifications were essentially impossible to set up. Fortunately, email services are the area with the most generous free quotas.
Resend: 3,000 free emails per day, with a monthly limit of 100. The API is very clean and straightforward—it can be integrated with just a few lines of code. I previously wrote a detailed review of Resend; if you’re interested, feel free to check it out. Its dashboard is very intuitive, allowing you to clearly see the delivery status and open rates for each email.
Brevo (formerly Sendinblue): 300 free emails per day, with no limit on the number of contacts. This policy of unlimited contacts is very user-friendly; many competitors charge based on the number of contacts, so costs can skyrocket as your list grows. Brevo also comes with built-in CRM and marketing automation features, so if you need email marketing, one platform is all you need.
Pushover: If you need to send push notifications to your phone (such as server alerts or notifications when a web crawler finishes), Pushover is a simple and reliable option. Its API has only a few parameters, and notifications are delivered almost instantly. However, it isn’t completely free; for a one-time fee of $5, you get lifetime access with no limit on the number of messages.
Monitoring and Logging
Many people just leave things alone once they go live, only realizing their service is down when users complain. In fact, the free tier of monitoring tools is more than enough for personal projects.
Uptime Robot: A long-established monitoring service; the free version supports 50 monitors, checking every 5 minutes. It supports HTTP, port, Ping, and keyword monitoring. I’ve been using this service to monitor the availability of all my projects for three or four years now, and the SMS and email alerts have never failed me. Recently, they added Telegram notifications, making it even more convenient to use.
Better Stack: The interface is much more appealing than Uptime Robot’s. The free version offers 10 monitors, with a minimum check interval of 3 minutes. Its strength lies in its well-designed aggregated view—if you’re monitoring multiple services at the same time, its Dashboard lets you see the overall health at a glance. The status page feature is also included for free, and you can set it up as a public page for users to view.
Sentry: The gold standard for error tracking. The free version includes 5,000 error events per month, which is more than enough for small teams. It automatically captures both front-end JavaScript errors and back-end exception stacks, and even flags the commit where the error originated. When fixing bugs, you can directly view the complete call stack and user navigation path—which is a million times more useful than a user simply reporting that ”the page went blank.”
Development and Collaboration Tools
These tools aren't intended for end users, but they can significantly boost your development efficiency.
GitHub: The free plan already includes unlimited private repositories, 2,000 minutes of CI/CD Actions, and 500 MB of package storage. All of my personal projects are on GitHub, and I use Actions to run automated tests and deployments, so I basically don’t need any additional CI services. If you’re working on an open-source project, the Actions quota is unlimited.
Cloudflare Tunnel: A powerful tool for exposing local services to the public internet—and it’s completely free. I used to use ngrok for internal network access, but with the free version, the domain name would change every time I restarted the service, and there were limits on the number of connections. Cloudflare Tunnel not only provides a fixed domain name but also includes HTTPS out of the box, which is especially useful for developing and debugging Webhook callbacks.
Plausible Analytics: A lightweight alternative to Google Analytics. If you don’t want to place a tracking script that’s over ten KB on your website or deal with GDPR compliance issues, Plausible’s free self-hosted version is a great option. I’ve migrated my own blog from GA to the self-hosted version of Plausible, and page load times are faster now, and the data is cleaner.
DNS and CDN
Domain name resolution and content delivery are the lifeblood of a website, and in these two areas, free services are actually more user-friendly than paid ones.
Cloudflare DNS: The free plan supports unlimited DNS lookups, DDoS protection, and basic WAF rules. With its global Anycast network, its resolution speed ranks among the best of all free DNS services. I host the DNS for all my domains on Cloudflare, and I haven’t experienced a single outage in three or four years.
Bunny CDN: Strictly speaking, it’s not free, but it’s cheap enough that it might as well be. Its data usage is billed by region—about 1 cent per GB in Asia—which is much more cost-effective than Cloudflare’s Pro plan. If your users are primarily concentrated in a specific region, Bunny’s region-based pricing can save you a lot of money. The only issue is that its console design is a bit ”old-school,” so it takes some getting used to at first.
Some Recommendations for Use
Free tools are great, but there are a few things I’d like to share based on my own experiences with pitfalls.
Don’t rely on free services for critical processes. If you’ve built an e-commerce website, make sure you have a backup notification plan for payment callback webhooks. Free services can change their terms or even shut down at any time; your business can’t come to a halt just because a free tool goes down. I make it a habit to have a Plan B for core functions—for example, using Resend as my primary email service and switching to Brevo as a backup.
Keep an eye on your actual usage of free quotas. Some services offer free quotas that seem generous, but your actual usage may exceed your expectations. For example, Sentry’s 5,000 error events—if your code has a lot of bugs, you might use them all up in just one week. We recommend setting up alerts when your usage reaches 801 TP3T, rather than waiting until you’ve exceeded the quota before realizing it.
One final point: Make good use of combinations. While these tools have their limitations when used individually, combining them allows you to build a complete product flow at virtually no cost. I’ve seen an independent developer who used a combination of Cloudflare, Supabase, Vercel, and Resend to serve over 2,000 users at zero monthly cost. The key to this approach lies in having a clear understanding of the limitations of each tool.
If you're using any other useful free tools, feel free to let me know in the comments section—I'll update this list later.
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