Fly.io
Ranked 3 of 7 platform as a services by recommenders
Simple way to deploy containers and fast VMs, with pay-as-you-go pricing and praised support. Critics most often cite outages and API downtime.
Simple way to deploy containers and fast VMs, with pay-as-you-go pricing and praised support. Critics most often cite outages and API downtime.
114 people gave an opinion
- recommend it
- 72
- criticize it
- 42
- approval share
- 63%
Recommended in 12 of 13 months
- November 2025: recommended
- December 2025: recommended
- January 2026: recommended
- February 2026: recommended
- March 2026: recommended
- April 2026: recommended
- May 2026: recommended
- June 2026: recommended
- July 2026: recommended
- August 2026: recommended
- September 2026: recommended
- October 2026: recommended
- November 2026: not recommended (month in progress)
Owned for 4 years
Median of the 6 owners who said how long they have had it.
Each square is one year.
Why it doesn’t carry the badge
- 72 people recommend itNeeds 10 or more, met.
- 1.7 recommenders for every criticNeeds 2 to 1 or better, not met.
- Recommended in 12 of 13 monthsNeeds 4 or more, met.
The same three rules apply to every product, and the badge can’t be bought. How the badge works
What people say about it
The reasons people give, with the number of comments that give each one. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Fast VMs that start on request
“The whole selling point of fly is lightweight and fast VMs that can be "off" when not needed and start on-request.”
Comment from 14 Mar 2026 in “Offloading FFmpeg with Cloudflare” “making it dead simple to get a VM at a domain or IP in a few seconds is good and useful”
Comment from 27 Dec 2025 in “Exe.dev/” “Using either the fly command or their api, you can kick off a one-off machine that runs an arbitrary script on boot and dies when that script ends.”
Comment from 14 Mar 2026 in “Offloading FFmpeg with Cloudflare” Responsive, helpful support including founders
“Fly's support was absolutely top-notch, up to and including Kurt personally working with me to help debug our deployments.”
Comment from 25 Jul 2026 in “Fly.io CEO Kurt Mackey is stepping down” “Fly's support was absolutely top-notch, up to and including Kurt personally working with me to help debug our deployments”
Comment from 26 Jul 2026 in “Fly.io CEO Kurt Mackey is stepping down” “the CEO responded to me personally in less than 10 minutes”
Comment from 6 Feb 2026 in “An Update on Heroku” - Comment from 6 Feb 2026 in “An Update on Heroku”
Low, pay-as-you-go pricing
“Cloudflare, Fly.io litestream offerings and Turso are pretty reasonably priced, given the global coverage.”
Comment from 3 Feb 2026 in “Bunny Database” “the pricing is fixed - you pay $1.94/month (less if you suspend your machine) for the smallest instance”
Comment from 26 Jun 2026 in “Run isolated sandboxes with full lifecycle control: AWS introduces MicroVMs” “missing the pay-as-you-go pricing & rapid scaling model that makes Fly worth using”
Comment from 25 May 2026 in “The bootstrapper's EU stack for under €10 per month” - Comment from 18 May 2026 in “Show HN: Files.md – open-source alternative to Obsidian”
- Comment from 12 Apr 2026 in “I run multiple $10K MRR companies on a $20/month tech stack”
Heroku-like, easy deploys
“For actual server paas that can run docker containers, render.com and fly.io are what heroku could have evolved to.”
Comment from 12 Nov 2025 in “Heroku Support for .NET 10” “They took all of the great things about Heroku but also dramatically improved and added new capabilities”
Comment from 6 Feb 2026 in “An Update on Heroku” “Fly and Render are what heroku would be if they didn't stop innovating.”
Comment from 10 May 2026 in “I returned to AWS, and was reminded why I left” - Comment from 2 Apr 2026 in “EmDash: A Fresh Take on CMS”
What people warn about
Each mark is one comment
Frequent outages and downtime
“great platform occasionally goes down and requires a bit of attention but the support forum is great”
Comment from 6 Feb 2026 in “An Update on Heroku” “they would go down all the time or have unexpected CI bugs/changes”
Comment from 19 Nov 2025 in “Show HN: I made a down detector for down detector” “API downtime is a semi-frequent occurrence, as are transient API errors and slowness.”
Comment from 11 Jan 2026 in “Code and Let Live” - Comment from 25 Jul 2026 in “Fly.io CEO Kurt Mackey is stepping down”
Company's public statements alarm critics
“the way certain people at that company speak to others (e.g. that post) is why they will never count me as a customer”
Comment from 25 Jul 2026 in “Fly.io CEO Kurt Mackey is stepping down” “I've been watching Kurt's AI-pillness advancing over time, but I didn't expect it to metastasize so quickly.”
Comment from 24 Sep 2026 in “Rails World 2026 Opening Keynote [video]” “If they're not going to lawyer up when it comes to the 4th amendment, I will never use this service.”
Comment from 28 Oct 2026 in “Evidence of a spying operation by ICE against left-wing social movements” - Comment from 25 Jul 2026 in “Fly.io CEO Kurt Mackey is stepping down”
- Comment from 25 Jul 2026 in “Fly.io CEO Kurt Mackey is stepping down”
Costs add up versus alternatives
“I love fly, but it adds up when I have a bunch of small things that I want isolated”
Comment from 23 Apr 2026 in “I Am Building a Cloud” “There's no reason to throw money at those providers when there are many options a dozen times cheaper.”
Comment from 8 Dec 2025 in “Show HN: ReadyKit – Superfast SaaS Starter with Multi-Tenant Workspaces” “They are almost at Big Three cloud/Vercel level of cost with none of the stability.”
Comment from 26 Jul 2026 in “Fly.io CEO Kurt Mackey is stepping down” Storage and IPv6 limitations
“having a disk attached to a VM instance where you can write data is never a default and usually complicated or expensive to setup”
Comment from 6 Nov 2025 in “What the hell have you built” “fly.io doesn’t support outbound ipv6 connections but defaults to a dns server that returns them”
Comment from 3 Jan 2026 in “IPv6 just turned 30 and still hasn't taken over the world”
Other platform as a services people recommend
The four most recommended other platform as a services, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.
| Product | Recommend | Criticize | Approval | Months | Owned | Badge |
|---|---|---|---|---|---|---|
| Railway | 94 | 159 | 37% | 10 | 4 mo7 owners | — |
| Heroku | 82 | 116 | 41% | 10 | 10 yrs7 owners | — |
| Fly.ioThis page | 72 | 42 | 63% | 12 | 4 yrs6 owners | — |
| Render | 44 | 19 | 70% | 8 | 1 yr3 owners | Approved |
| Google App Engine | 11 | 7 | 61% | 8 | — | — |
What people said
40 of the 127 comments that mention it, newest first. Each links to the original comment.
“If they're not going to lawyer up when it comes to the 4th amendment, I will never use this service.”
“I've been watching Kurt's AI-pillness advancing over time, but I didn't expect it to metastasize so quickly.”
“Fly's support was absolutely top-notch, up to and including Kurt personally working with me to help debug our deployments”
“They are almost at Big Three cloud/Vercel level of cost with none of the stability.”
“today I operate a few production workloads on it that are very stable and reliable”
“the reality of using them was that I was dealing with major outages almost monthly”
“Fly's support was absolutely top-notch, up to and including Kurt personally working with me to help debug our deployments.”
“the way certain people at that company speak to others (e.g. that post) is why they will never count me as a customer”
“I clicked a button in my PaaS and I have an oncall responder and incident manager ready to go.”
“the CEO writing an article like that makes me think fly.io is a deeply unserious company”
“they lost a lot of aura among folks i know with the 'ai skeptics are nuts' article”
“the pricing is fixed - you pay $1.94/month (less if you suspend your machine) for the smallest instance”
“missing the pay-as-you-go pricing & rapid scaling model that makes Fly worth using”
“Fly, Render, and even Heroku still are all better choices then working with Railway I think”
“The initial setup and fly.io setup was worth me saving ~50 Euro/year”
“Fly and Render are what heroku would be if they didn't stop innovating.”
“I love fly, but it adds up when I have a bunch of small things that I want isolated”
“Moving the same workload to Hetzner or even a single Fly.io region dropped it by >80% without touching the app.”
“Scaling to zero with database persistence using litestream has cut my bill down to $0.1 per month”
“platforms like Railway and Fly have made deploys nearly painless”
“It took me thirty seconds to find the fly.io guidance to use BullMQ with Node+Redis.”
“Using either the fly command or their api, you can kick off a one-off machine that runs an arbitrary script on boot and dies when that script ends.”
“The whole selling point of fly is lightweight and fast VMs that can be "off" when not needed and start on-request.”
“The site loaded instantaneously on the first try, so fast I thought it was local.”
“They took all of the great things about Heroku but also dramatically improved and added new capabilities”
“the CEO responded to me personally in less than 10 minutes”
“great platform occasionally goes down and requires a bit of attention but the support forum is great”
“Cloudflare, Fly.io litestream offerings and Turso are pretty reasonably priced, given the global coverage.”
“Fly's replay mechanism is clever, but that initial bounce still adds latency.”
“found it was a lot more polished, and now have multiple production apps running there”
“The way they force at least one "fuck" into all of their promo is just so cool.”
“API downtime is a semi-frequent occurrence, as are transient API errors and slowness.”
“fly.io is doing really good work. I've super enjoyed building our product on their platform.”
“fly.io doesn’t support outbound ipv6 connections but defaults to a dns server that returns them”
“making it dead simple to get a VM at a domain or IP in a few seconds is good and useful”
“There's no reason to throw money at those providers when there are many options a dozen times cheaper.”
“they would go down all the time or have unexpected CI bugs/changes”
“outsourcing that to Cloudflare or Fastly or Fly.io or whomever is a reasonable strategy”
“For actual server paas that can run docker containers, render.com and fly.io are what heroku could have evolved to.”
“having a disk attached to a VM instance where you can write data is never a default and usually complicated or expensive to setup”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.