# What does Fly.io, Inc. use? Fly.io, Inc. (fly.io) shows public evidence of 37 tools, according to runsonwhat (last checked 2026-10-17). - Industry: Cloud Hosting - Size: 11–50 employees - Based in: San Francisco, United States - Founded: 2017 - LinkedIn: https://www.linkedin.com/company/flydotio ## Edge & Hosting | Tool | Category | Evidence | Since | |---|---|---|---| | [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | Subprocessor list | | | [Amazon Web Services](https://www.runsonwhat.com/reverse/aws) | Hosting & Cloud | Subprocessor list | | | [OVHcloud](https://www.runsonwhat.com/reverse/ovh) | Hosting & Cloud | Subprocessor list | | | [Heroku](https://www.runsonwhat.com/reverse/heroku) | Hosting & Cloud | Subprocessor list | | ## Application | Tool | Category | Evidence | Since | |---|---|---|---| | [Tailwind CSS](https://www.runsonwhat.com/reverse/tailwind) | Frontend | Website code | | | [Anthropic](https://www.runsonwhat.com/reverse/anthropic) | AI | Subprocessor list | | | [OpenAI](https://www.runsonwhat.com/reverse/openai) | AI | Subprocessor list | | | [Stripe](https://www.runsonwhat.com/reverse/stripe) | Payments & Billing | DNS verification records, Website code | | | [Metronome](https://www.runsonwhat.com/reverse/metronome) | Payments & Billing | Subprocessor list | | ## Data & Observability | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Analytics](https://www.runsonwhat.com/reverse/ga) | Analytics | Website code | | | [Google Tag Manager](https://www.runsonwhat.com/reverse/gtm) | Analytics | Website code | | | [Sentry](https://www.runsonwhat.com/reverse/sentry) | Monitoring | Subprocessor list | | | [web-vitals](https://www.runsonwhat.com/reverse/web-vitals) | Monitoring | Website code | | | [PostHog](https://www.runsonwhat.com/reverse/posthog) | Analytics | Website code | | | [Plausible](https://www.runsonwhat.com/reverse/plausible) | Analytics | Website code | | | [Atlassian Statuspage](https://www.runsonwhat.com/reverse/statuspage) | Monitoring | DNS verification records, Email records, Website code | | | [LaunchDarkly](https://www.runsonwhat.com/reverse/launchdarkly) | Flags & Experiments | Subprocessor list | | | [RudderStack](https://www.runsonwhat.com/reverse/rudderstack) | Analytics | Subprocessor list | | | [incident.io](https://www.runsonwhat.com/reverse/incidentio) | Monitoring | Subprocessor list | | | [Snowflake](https://www.runsonwhat.com/reverse/snowflake) | Data Pipeline | Subprocessor list | | | [Honeycomb](https://www.runsonwhat.com/reverse/honeycomb) | Monitoring | Subprocessor list | | ## Go-to-market | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Ads](https://www.runsonwhat.com/reverse/google-ads) | Ads & Pixels | Website code | | | [HubSpot](https://www.runsonwhat.com/reverse/hubspot) | Sales & CRM | Subprocessor list | | | [Intercom](https://www.runsonwhat.com/reverse/intercom) | Support & Docs | Email records | | | [Help Scout](https://www.runsonwhat.com/reverse/helpscout) | Support & Docs | Email records | | | [Customer.io](https://www.runsonwhat.com/reverse/customerio) | Marketing | Subprocessor list | | | [Mintlify](https://www.runsonwhat.com/reverse/mintlify) | Support & Docs | Custom domain | 2026-09 | | [Discourse](https://www.runsonwhat.com/reverse/discourse) | Support & Docs | Custom domain | 2020-07 | ## Company Ops | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Workspace](https://www.runsonwhat.com/reverse/google-workspace) | Workspace | Email records, Website code | | | [Apple Business](https://www.runsonwhat.com/reverse/apple) | Workspace | DNS verification records | | | [Mailgun](https://www.runsonwhat.com/reverse/mailgun) | Email Delivery | Subprocessor list | | | [Slack](https://www.runsonwhat.com/reverse/slack) | Collaboration | Subprocessor list | | | [Dropbox](https://www.runsonwhat.com/reverse/dropbox) | Collaboration | Subprocessor list | | | [DMARC Digests](https://www.runsonwhat.com/reverse/dmarcdigests) | Security & Compliance | Email records | | | [Rippling](https://www.runsonwhat.com/reverse/rippling) | People & HR | DNS verification records | | ## FAQ ### What tools does Fly.io use? As of October 2026, runsonwhat has found 37 tools at Fly.io (fly.io) in public records. Edge & Hosting: Cloudflare, Amazon Web Services and OVHcloud. Application: Tailwind CSS, Anthropic and OpenAI. Data & Observability: Google Analytics, Google Tag Manager and Sentry. Go-to-market: Google Ads, HubSpot and Intercom. Company Ops: Google Workspace, Apple Business and Mailgun. Last checked October 17, 2026. ### What cloud does Fly.io run on? Fly.io uses Amazon Web Services for hosting and cloud infrastructure, alongside OVHcloud and Heroku, according to runsonwhat (October 2026). runsonwhat found Amazon Web Services through Amazon Web Services on fly.io's subprocessor list. Amazon Web Services is used by 145,105 companies runsonwhat tracks. ### What CRM does Fly.io use? Fly.io uses HubSpot for its CRM, according to runsonwhat (October 2026). runsonwhat found HubSpot through HubSpot on fly.io's subprocessor list. HubSpot is used by 92,694 companies runsonwhat tracks. ### What email provider does Fly.io use? Fly.io uses Google Workspace for email and office software, alongside Apple Business, according to runsonwhat (October 2026). runsonwhat found Google Workspace through email records that authorize Google Workspace and code on fly.io. Google Workspace is used by 399,625 companies runsonwhat tracks. ### What does Fly.io use for customer support? Fly.io uses Intercom for customer support and documentation, alongside Help Scout, Mintlify and Discourse, according to runsonwhat (October 2026). runsonwhat found Intercom through email records that authorize Intercom. Intercom is used by 8,448 companies runsonwhat tracks. ### What payment provider does Fly.io use? Fly.io uses Stripe for payments and billing, alongside Metronome, according to runsonwhat (October 2026). runsonwhat found Stripe through a DNS verification record for Stripe and code on fly.io. Stripe is used by 26,656 companies runsonwhat tracks. ### How long has Fly.io used Discourse? Fly.io has used Discourse since at least July 2020, going by the first public certificate of the fly.io subdomain that points at Discourse. Other long-running tools at Fly.io include Mintlify (since September 2026). ### Does Fly.io use Cloudflare? Yes. runsonwhat found Cloudflare at Fly.io through Cloudflare on fly.io's subprocessor list. Cloudflare is a CDN & Edge tool used by 695,765 companies runsonwhat tracks. ### Does Fly.io use AI tools? Yes. runsonwhat has found Anthropic and OpenAI at Fly.io; Anthropic, for example, through Anthropic on fly.io's subprocessor list. AI services called only from servers leave no public trace, so Fly.io may use more AI tools than these. ### Which companies have a tech stack similar to Fly.io's? The companies with the stacks most like Fly.io's are Tella, LaunchDarkly, Twilio and RevenueCat, according to runsonwhat (October 2026). Each shares 16 to 19 tools with Fly.io, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what Fly.io uses? runsonwhat reads public records only. Of the 37 tools at Fly.io, 18 were found through its own subprocessor list, 7 through code on fly.io, 5 through DNS records, 4 through email records, 2 through subdomains that point at the vendor and 1 through website configuration files. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and fly.io about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/fly.io (updated October 2026). Counts are companies with direct public evidence of the tool (DNS records, certificates, website code, a real-browser crawl, subprocessor lists), so they are lower bounds. Methodology: https://www.runsonwhat.com/methodology.