Source-backed analysis9
Review basis
The AppDuo team prepared this review by analysing product features, official documentation and user feedback to help you understand its strengths, limitations and suitability for your needs.
9 reference sourcesInformation updated Nov 10, 2026
How we review
By AppDuo Editorial Team · Updated
- Web
- API
On this page
Decide at a glance
Our verdict
Stack Overflow remains a large, free library of programming answers with clear authorship and edit history, useful for cross-checking what AI tools say. The trade-offs: many find its moderation harsh, new question volume has fallen sharply, and the company is shifting its focus to enterprise products and AI data licensing.
Best for: Developers looking for fixes to specific errors, with answer history and attribution
Skip it if: Beginners wanting friendly guidance; many Trustpilot reviews mention closed questions, downvotes and harsh comments
Pros
- A large knowledge base: 83M+ questions and answers built up over 18 years, per stackoverflow.co
- The public site is free, with content licensed CC BY-SA
- Still useful for verification: in the 2026 developer survey 15.9% of respondents visit more to check sources
Cons
- Trustpilot gives just 1.6/5 from 227 reviews (67% one star; the profile is unclaimed, so the sample may be skewed), citing a harsh culture, closed questions and account restrictions
- 2026 survey: 64.1% visit less for simple questions and 28.9% ask fewer; Wikipedia says monthly questions fell from over 100,000 (2022) to a few thousand by early 2026
All pros and cons · Who is it for?
Pros
- A free Stack Internal Starter plan plus API and data-licensing options for organisations
Cons
- In 2023 over 70% of moderators went on strike over a policy on AI-detection tools
- Licenses data to AI companies, and some users object to the lack of an opt-out
Best for
- AI-tool users who want to verify outputs against cited sources; in the 2026 survey 15.9% of respondents said they visit more for verification
- Small engineering teams wanting to try an internal knowledge base on the free Stack Internal Starter plan
Skip it if
- Anyone wanting quick answers to brand-new problems, since new question volume has dropped sharply
Experience & key features
What is Stack Overflow?
Stack Overflow was created in 2008 by Jeff Atwood and Joel Spolsky to make coding help easier to find; the public beta opened on 15 September 2008. It is a public Q&A site where users ask questions and the community answers and ranks them, with content licensed CC BY-SA. Prosus acquired the company for $1.8 billion (announced June 2021, completed August 2021). According to stackoverflow.co the network holds 83M+ questions and answers, and 77% of developers have an account.
Products and business model
Beyond the public site, Stack Overflow Business offers Stack Internal (an enterprise knowledge base the company says 15,000+ companies use), Stack Data Licensing (Q&A data from 150+ Stack Exchange sites for AI companies via API or the Snowflake and Databricks marketplaces) and Stack Ads. Per the pricing page, Stack Internal has a free Starter plan (up to 3 collaborators, 1,000 credits a month) and a quote-based Organization plan priced on credits. Recent press releases cover AI Assist (2 December 2025) and the next generation of Stack Internal (30 September 2026).
The impact of AI
The 2025 developer survey (49,000+ responses) found 84% use or plan to use AI tools and about 46% distrust their accuracy. The 2026 survey drew 30,903 responses; of the 16,985 who answered the question on how their Stack Overflow use has changed, 64.1% visit less for simple questions and 28.9% ask fewer questions, while 15.9% visit more to verify sources. According to Wikipedia, monthly questions fell from over 100,000 in 2022 to a few thousand by early 2026, attributed to a hostile moderation culture and generative-AI competition; secondary blogs give differing figures, so treat these as approximate.
More analysis
Who it's for and how it compares
Stack Overflow suits people who need sourced answers to specific coding problems. Reddit and Hacker News lean toward open discussion, Viblo and Daynhauhoc are Vietnamese-language developer communities, and ChatGPT or GitHub Copilot answer instantly but must be checked. If you plan to post, the Trustpilot complaints (1.6/5, a small sample) suggest searching for similar questions and reading the rules first.
Screenshots
Plans & pricing
Prices last verified Nov 10, 2026
Public platform (stackoverflow.com)
Free
Asking, answering and reading on stackoverflow.com are free. Limit details could not be verified because stackoverflow.com itself was inaccessible during research.
Stack Internal Starter
Free
Per the Stack Overflow Business pricing page: up to 3 collaborators, 1,000 credits a month (unused credits don't roll over) and up to 3 connectors. The page is inconsistent on scopes: the feature list says up to 2, the comparison table up to 3.
Stack Internal Organization
Contact sales
Custom pricing based on the credits needed; contact sales for a quote. Unlimited collaborators, scopes and connectors plus a custom ingestion API; paid by invoice.
- Free plan limits
- The public Q&A site is free. The enterprise product Stack Internal has a free Starter plan for small teams; each search or answer uses 1 credit and each knowledge update uses 3.
- Free trial
- No free trial
Cancellation & refunds
No verified refund information. The enterprise plan is invoiced under an agreement with sales.
Privacy
Stack Overflow's privacy-policy page could not be opened during research, so details on data collection and retention cannot be confirmed. What was verified: stackoverflow.co presents Stack Data Licensing, which licenses Q&A data to AI companies, and shows OpenAI and Google Cloud logos under the AI companies building with its data. According to Wikipedia, user contributions are licensed under CC BY-SA. One Trustpilot reviewer objects to user-written content being monetised with no opt-out. Wikipedia also records a May 2019 bug that gave an attacker production access, affecting about 184 public-network users.
Stack Overflow alternatives
7.9/10GitHub
Code hosting, code review, CI/CD and Copilot on one platform
7.5/10GitHub Copilot
An AI coding assistant that runs in most major IDEs and ties into GitHub
Frequently asked questions
Is Stack Overflow free?
The public Q&A site is free. The enterprise product Stack Internal has a free Starter plan (up to 3 collaborators) and a quote-based Organization plan.
Has AI replaced Stack Overflow?
Not entirely. The 2026 survey shows most respondents visit less for simple questions, but 15.9% visit more to verify sources, and 82% of 2025 respondents still visit at least a few times a month. New question volume has fallen sharply.
Is Stack Overflow content used to train AI?
Yes. Stack Overflow licenses data access to AI companies through Stack Data Licensing; its page shows OpenAI and Google Cloud logos among the AI companies building with its data. User contributions are under CC BY-SA.
Why was my question closed?
Trustpilot reviewers say questions are often closed as duplicates or off-topic. Search for similar questions first, then state the error, a minimal code sample that reproduces it and what you've tried.
Review evidence & sources9
Scores
- Ease of use
- 6.4
- Features
- 7.3
- Value for money
- 8.2
- Performance
- 6.2
- Support
- 5.5
- Privacy & security
- 5.5
Why this score
The Q&A layout is familiar, but Trustpilot reviewers report questions closed as duplicates, harsh comments and Cloudflare CAPTCHA loops when signing up. Newcomers struggle to ask questions to the expected standard. The interface is English-only.
Why this score
Q&A with ranking and edit history, tags, the Stack Exchange API, a network of 150+ Stack Exchange sites and enterprise connectors (Microsoft Graph, Databricks Marketplace). No real-time chat or deep collaboration tools for individuals.
Why this score
A free public site with 83M+ questions and answers and a free Starter plan for small teams. Enterprise pricing is unpublished and quoted on credits.
Why this score
The archive is still heavily used: 82% of 2025 survey respondents visit at least a few times a month. But new question volume has collapsed, so fresh topics get fewer answers, and some reviewers complain of outdated content.
Why this score
A help centre and community exist, but support relies largely on volunteer moderators; Trustpilot reviewers describe account restrictions with little explanation. stackoverflow.com's help pages were inaccessible during research.
Why this score
The privacy policy could not be read, so the score is held back. Content is public under CC BY-SA and licensed as data to AI companies; users object to the lack of an opt-out; the 2019 bug affected about 184 users.
What users say
- Trustpilot1.6/5 · 227
Sources
- Vendor-providedStack Overflow Business homepageNov 10, 2026
- Vendor-providedStack Overflow Business press and company newsNov 10, 2026
- Vendor-providedStack Data Licensing / API solutionsNov 10, 2026
- Vendor-providedStack Internal pricingNov 10, 2026
- Vendor-providedStack Overflow Developer Survey 2025Nov 10, 2026
- Vendor-providedStack Overflow Developer Survey 2026Nov 10, 2026
- Community-reportedWikipedia: Stack OverflowNov 10, 2026
- review-siteTrustpilot: stackoverflow.comNov 10, 2026
- Vendor-providedStack Internal product pageNov 10, 2026
Specs & compatibility
- Developer
- Stack Exchange, Inc.
- Headquarters
- United States
- Launched
- 2008
- Category
- CommunityDevelopment
Capabilities
- Public API
- Real-time collaboration
- Integrations
Platforms
- Web
- API
Interface languages
- English
Integrations
- Microsoft Graph
- Databricks Marketplace
- Snowflake
Support
- Help center
- Community forum
Change history
- Feature.Launches the next generation of Stack Internal for enterprise AI.
- Feature.Announces AI Assist, billed as "AI for Developers, by Developers".
- Update.The moderator strike, which began in June and at its peak involved over 70% of moderators, ends after negotiations.
Full change history (7)
- Company.Prosus acquires Stack Overflow for $1.8 billion (the deal was announced in June 2021).
- Update.A bug lets an attacker gain production access, affecting about 184 public-network users.
- Company.Raises $6 million in venture capital led by Union Square Ventures.
- Launch.Stack Overflow, created by Jeff Atwood and Joel Spolsky, opens its public beta.