The Twelve-Factor App
Development methodology in Developer tools
Short, widely cited principles for deployable services that many engineers still treat as foundational, though critics say it assumes service deployments and a secure environment.
17 people recommended The Twelve-Factor App in Hacker News comments, 8 had mixed feelings and 2 criticized it, November 2025 to October 2026.
13 of the 17 people who recommend it commented in one thread, “The Twelve-Factor App (2025)”.
Summary written by Claude from 28 comments. It was written before the November 2026 recount, and 24 of those comments still count.
27 people gave an opinion
- recommend it
- 17
- mixed feelings
- 8
- warn against or regret it
- 2
The record
Recommended in 4 of 12 months
In 5 different threads.
- November 2025: recommended
- December 2025: not recommended
- January 2026: not recommended
- February 2026: recommended
- March 2026: not recommended
- April 2026: not recommended
- May 2026: not recommended
- June 2026: not recommended
- July 2026: not recommended
- August 2026: recommended
- September 2026: recommended
- October 2026: not recommended
Why it doesn’t carry the badge
- 17 people recommend itNeeds 10 or more, met.
- 8.5 recommenders for every criticNeeds 2 to 1 or better, met.
- Recommended in 4 of 12 monthsNeeds 4 or more, met.
- Recommended in 5 threadsNeeds 5 or more, met.
- 13 of its 17 recommenders came from one threadNeeds half or less, not met.
The same rules apply to every product, and the badge can’t be bought. Mixed feelings count toward neither side. How the badge works
What people say about it
Reasons grouped from a sample of 24 of the 29 opinions about it, picked in proportion to how many people recommend it, have mixed feelings and criticize it. Each mark is one comment in the sample. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Still relevant good practices
“Still incredibly relevant. Even if you don’t apply it, there is so much to learn by reading this in 15 minutes.”
Comment from 28 Aug 2026 in “The Twelve-Factor App (2025)” “it's still a really great collection of good practices that lead you to a better place”
Comment from 28 Aug 2026 in “The Twelve-Factor App (2025)” “While this is and has always been outstanding advice”
Comment from 28 Aug 2026 in “The Twelve-Factor App (2025)” - Comment from 29 Aug 2026 in “The Twelve-Factor App (2025)”
Foundational reference for DevOps
“Love 12factor, evangelized it at a lot of companies too”
Comment from 28 Aug 2026 in “The Twelve-Factor App (2025)” “I still point to this document as the base of DevOps.”
Comment from 29 Aug 2026 in “The Twelve-Factor App (2025)” Natural, clear way to build software
“They sound super-obvious these days, but at the time, for a lot of us, they were really nice to see.”
Comment from 28 Aug 2026 in “The Twelve-Factor App (2025)” “felt so natural and right way to do software”
Comment from 28 Aug 2026 in “The Twelve-Factor App (2025)” Timeless principles, classic status
“Good principles never die, just like good music I guess.”
Comment from 28 Aug 2026 in “The Twelve-Factor App (2025)” “Imperfect but certified classic”
Comment from 28 Aug 2026 in “The Twelve-Factor App (2025)”
What people warn about
Each mark is one comment
Oriented to service deployments only
“but it's very service dev oriented.”
Comment from 28 Aug 2026 in “The Twelve-Factor App (2025)” Assumes a secure environment
“The unwritten assumption in 12 Factor is: the environment is secure”
Comment from 28 Aug 2026 in “The Twelve-Factor App (2025)”
What people said
24 of the 29 opinions about it, picked in proportion to the three counts, newest first. Each links to the original comment.
“I feel like there is so much "wisdom" encoded in books and writings from some of the most prolific engineers and architects”
“12 factor apps clearly apply to deployments, not your local dev environment.”
“not only best practices, but also limitations of the platform they had built”
“I still point to this document as the base of DevOps.”
“it is a bit more nuanced than it seems at first”
“I never understood why the 12 factor app is against monorepos.”
“I still think it's a great way to ship software”
“Storing config in environment variables is just such an incredibly obviously awful thing to do”
“it's still a really great collection of good practices that lead you to a better place”
“it's extremely aspirational, and I can pick apart pretty much every one of these factors”
“Good principles never die, just like good music I guess.”
“I’m glad to see this again”
“Imperfect but certified classic”
“but it's very service dev oriented.”
“Love 12factor, evangelized it at a lot of companies too”
“I feel the 12FA model totally punted on state by defining it out of scope”
“While this is and has always been outstanding advice”
“felt so natural and right way to do software”
“The unwritten assumption in 12 Factor is: the environment is secure”
“They sound super-obvious these days, but at the time, for a lot of us, they were really nice to see.”
“Still incredibly relevant. Even if you don’t apply it, there is so much to learn by reading this in 15 minutes.”
“most devs still haven't internalized this which is a shame”
“That’s pretty close to the 12 Factor App principles.”
“was blown away by how well they understood the problem”
Counts come from 1,791,911 Hacker News comments labeled by Claude, November 2025 to October 2026, with data through October 31, 2026. Counts updated 2 Nov 2026. How we count. Report a mistake.