fly.io Reviews 20

We experienced zero friction migrating our containerized workloads over to Fly.io. It is refreshing to see an infrastructure provider that isn't just an API wrapper over AWS; they run hardware-virtualized KVM containers that spin up fast enough to handle incoming HTTP requests natively. The built-in private mesh networking works beautifully over WireGuard tunnels out of the box, completely eliminating the need for bloated Terraform configurations for intra-cluster auth. To be fair, their official documentation can be quite sparse and minimalist, occasionally forcing you to hunt through their community forums to resolve specific edge-case routing issues. However, their new Sprites sandboxing feature executes environment checkpointing in under a second, and the CLI-driven deployment is rock solid.

I have a similar opinion to Srikanth's review: some users who rate Fly.io poorly may not have enough technical expertise to fully understand how the platform works.

I have been using Fly.io for over a year, and my experience has been consistently positive. The platform is simple, clean, and user-friendly. Pricing is transparent, so I always know what I am paying for, and deployments through flyctl are straightforward and reliable.

I have also used AWS extensively. While AWS offers more services and flexibility, it is significantly more complex. One of Fly.io's biggest strengths is that it provides a much simpler and more developer-friendly experience, with a clean interface and straightforward deployment workflow. For many projects, that simplicity is a major advantage rather than a limitation.

Fly.io is especially well suited for personal projects, learning, and small applications. If you understand how to optimize your resources and deployments, it is possible to run projects at very low cost. In my experience, the platform provides excellent value, and I appreciate how developer-focused it is.

I also want to support Fly.io because I believe they are building something valuable for developers. My experience with the platform has been excellent, and I hope they continue improving and growing in the years ahead.

Overall, Fly.io has been a reliable and enjoyable platform to use, and I would happily recommend it to other developers. I would especially recommend it to junior developers and anyone who wants to learn modern deployment workflows without the complexity of larger cloud platforms. The fast and straightforward deployment process makes it easy to focus on building and learning rather than spending hours on infrastructure configuration.

THIS IS THE WORST COMPANY THEY LITERALLY SHUT DOWN MY ACCOUNT FOR WHATVER REASON I HAVE 500 IN CREDITS AND SCREWED UP MY ENTIRE GROWING BUSINES

I WILL BE SUING THEM IF NOT RESPONDING SOON THESE GUYS ARE BAD

BE CAREFULL flyploy, fly.io ARE A BIG SCAM. NEVER GIVE YOUR CREDIT CARD INFORMATION : NO WAY BACK, THEY CHARGE YOU EVERY MONTH WITH NO POSSIBILITY TO CANCEL IT

I signed up and tried to set up an app. My attempts were not successful. I never successfully deployed an app once. Yet I was being charged for database clusters that were not getting any operations on them. I had an abandoned attempt to use them and gave up only to have multiple charge attempts. I'm glad I secured my payments from actually going through which saved me from losing money.

Signed up for a free trial and got DAILY email reminders asking me to add my credit card to their website when I only made an account.

No unsubscribe button, or way to reply to the email.

Seems very predatory in my opinion. I've never had a SaaS email me this aggressively for just signing up for their service.

In july 19, suddenly I got a mail from bank. Fly.io tried to deduct 25$. I instantly sent a mail to there support mail. They said I was activated Prepared Credit! But I never do it.

Today I get another mail, they try to charge 747$. After july I don't log into fly.io and my deploy was failed those time. Now when I login after seen this mail. I'm surprise! 22 days ago a project was deployed! But I do not deploy anything.

Please stay safe. Never trust fly.io for billing issues. They will suddenly charge from your card. They have various excuse.

fly.io offers stable hosting for my custom Discord bot through a Docker container.

The free plan, as noted in other reviews, doesn’t exist but is instead a pay-as-you-go plan which waves invoices smaller than $5.00, so make sure you know what you’re doing and set your fly.toml file accordingly.

Furthermore, seemless integration with GitHub and a nice UX overall. Thanks for waiving invoices smaller than $5.00, too!

Not stable. Definitely not production ready. Moved first app to Vercel and about to move the second one.
So many deployment errors, random 500 happening on their own admin dashboard.
Random unexplained delays when deploying etc..

Scammers. They unilaterally added a paid dedicated IP option to all free accounts, even for those who absolutely didn’t need it, and charged the money from the card without consent.

Hosted my telegram bot for a large group chat on fly.io. It ran an entire year without interruptions, virtually for free (got moved to the free tier automatically). Good stuff.

"Confirm your payment method to keep using our platform" then proceeds to charge me money when i am using the free plan. This is a scam.

I subscribed to this service to deploy my Remix app and paid $15 for half a month of support.
Unfortunately, the support I received was ineffective, so I canceled my subscription and deleted my account.
However, two days later, I was charged an additional $29 for email support that I didn’t request.
In total, I’ve spent $45-46 and wasted three days trying to deploy my app with no useful assistance.
I’m very dissatisfied with the service and would like a refund for the extra charges.

Update: Customer service has been refunded unexpected charges - because of that updating stars from one to two stars.

I give the second star just to thank the good customer service that refunded the surprise charges. I am a beginner developer but I still understand that if you make a free plan, you don't add surprise charges out of nowhere!! You warn the user that this is something you need to pay. But there was no warning, nothing. You might use fly.io if you know the pitfalls but I strongly suggest all the beginners to stay far away from this site!!!

Fly.IO is an upcoming genius provider.

One Dockerfile, free Let's Encrypt SSL certificates, and a reasonable cold start time.

My first cold start takes about 7 seconds and has the potential to cause a timeout. But, from a business perspective, this is hardly a problem. I am focused on recurring users and traffic spikes.

They face some downtime from time to time, but I tolerate this since I load balance between other cloud providers.

The users that have rated Fly poorly potentially do not have enough technical expertise and expect it to be like Wix or Shopify.

This will be one of the best (and simplest) serverless providers you will ever encounter in existence. I couldn't stand back and tolerate a 2.7-star review for these future Giants in the industry.

What a scam. You sign up for the hobby plan, thinking that it will cost you 5 dollars a month to try things out, and then the “extra fee for random services” goes crazy.

I don’t understand the people who plan these marketing stunts and make it so hard for the individual to understand the bill and delete the account and get out. This was surely designed to make it hard. What a scam way of making business. You almost had a perfect looking business, but then you had to go down that disgusting road. I will advise all newcomers with hobby projects to stay away from fly.

An outage of some kind nuked my website and now I can't even find the custom WordPress I uploaded to the attached volume. As a result, I've had to refund a client their maintenance fee for the year. To say I'm annoyed is an understatement. Initially I was very impressed by the platform but now I will telling my colleagues and friends to avoid like the plague. Digital Ocean is harder to setup initially but 100% the way to go if you value reliability

Bad! Not use it! Slow and Charge you for personal Projects

I have been using fly.io for almost 2 years now, there have been ups and downs, its been a bumpy road. But this is expected for a new provider.

In the course of these 2 years I have deployed various prototype NodeJS applications.

I have been around the block with my deployment infra - never feeling fully satisifed with any of them, AWS Lamda, GCP KE, CF Pages, CF workers, Netlify, Vercel (best DX imo), Heroku, DigitalOcean

But time and time again I come back to fly.io

It just works, no frills. You write a dockerfile, you deploy it. and thats it. This is the serverless dream that I think most providers miss out on - they try to abstract away the infra too much, with Fly you get the best of serverless but still have full control over what you are deploying

Its incredibly fast. I cannot stress this enough. No cold starts, it kind of blows my mind.

The monitoring is simple. With CF Workers I can't count the number of times I will get the 500 Cloudflare worker page with absolutely no logs showing and I had to contact support.

I could write a lot more, but just felt compelled to leave my opinion on this great service.

Satisifed customer, I will be using it for all my clients.

If only they could have have a fully managed Postgress service I would be entirely fly.io stack

I want to love fly.io.

We have a contender with a useful free tier again after Heroku (understandably I guess) got rid of it.

The http response latency is really, really good.

But the first day I hit problems with my servers not deploying that looking at their support site affected a lot of other users and ended up being platform issues.

Other customers are complaining that they changed defaults from dedicated to shared IP addresses, breaking their deployments and losing them business.

I'm unable to deploy my application again today (twice in 3 days!), with others in the forums failing to diagnose the same issue (the error messages are useless). One of them had "bricked their organisation" by deleting a builder while trying to fix it. At that point I gave up- I hadn't invested enough for it to be hassles moving.

I sincerely hope things improve and this is just a rocky moment in their growth, but I'd suggest checking the recent posts in their support forums to confirm things have changed.