# What does Fieldguide use? Fieldguide (fieldguide.io) shows public evidence of 21 tools, according to runsonwhat (last checked 2026-10-21). ## Edge & Hosting | Tool | Category | Evidence | Since | |---|---|---|---| | [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | DNS verification records, DNS records | | ## Application | Tool | Category | Evidence | Since | |---|---|---|---| | [Anthropic](https://www.runsonwhat.com/reverse/anthropic) | AI | DNS verification records | | | [OpenAI](https://www.runsonwhat.com/reverse/openai) | AI | DNS verification records | | | [Auth0](https://www.runsonwhat.com/reverse/auth0) | Auth & Identity | Custom domain | | | [turbopuffer](https://www.runsonwhat.com/reverse/turbopuffer) | Search | DNS verification records | | ## Data & Observability | Tool | Category | Evidence | Since | |---|---|---|---| | [LaunchDarkly](https://www.runsonwhat.com/reverse/launchdarkly) | Flags & Experiments | DNS verification records | | | [Better Stack](https://www.runsonwhat.com/reverse/betterstack) | Monitoring | Custom domain | | ## Go-to-market | Tool | Category | Evidence | Since | |---|---|---|---| | [HubSpot](https://www.runsonwhat.com/reverse/hubspot) | Sales & CRM | Custom domain, DNS verification records, Email records | | | [HubSpot CMS](https://www.runsonwhat.com/reverse/hubspot-cms) | Website & CMS | Custom domain | | ## Company Ops | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Workspace](https://www.runsonwhat.com/reverse/google-workspace) | Workspace | Email records | | | [SendGrid](https://www.runsonwhat.com/reverse/sendgrid) | Email Delivery | Email records | | | [Atlassian](https://www.runsonwhat.com/reverse/atlassian) | Dev Tools | DNS verification records | | | [Mailchimp Transactional](https://www.runsonwhat.com/reverse/mandrill) | Email Delivery | Email records | | | [DocuSign](https://www.runsonwhat.com/reverse/docusign) | Finance & Legal | DNS verification records | | | [Zoom](https://www.runsonwhat.com/reverse/zoom) | Collaboration | DNS verification records | | | [Slack](https://www.runsonwhat.com/reverse/slack) | Collaboration | DNS verification records | | | [Canva](https://www.runsonwhat.com/reverse/canva) | Collaboration | DNS verification records | | | [Cursor](https://www.runsonwhat.com/reverse/cursor) | Dev Tools | DNS verification records | | | [Figma](https://www.runsonwhat.com/reverse/figma) | Collaboration | DNS verification records | | | [Notion](https://www.runsonwhat.com/reverse/notion) | Collaboration | DNS verification records | | ## FAQ ### What tools does Fieldguide use? As of October 2026, runsonwhat has found 21 tools at Fieldguide (fieldguide.io) in public records. Edge & Hosting: Cloudflare. Application: Anthropic, OpenAI and Auth0. Data & Observability: LaunchDarkly and Better Stack. Go-to-market: HubSpot and HubSpot CMS. Company Ops: Google Workspace, SendGrid and Atlassian. Last checked October 21, 2026. ### What CRM does Fieldguide use? Fieldguide uses HubSpot for its CRM, according to runsonwhat (October 2026). runsonwhat found HubSpot through a subdomain that points at HubSpot and a DNS verification record. HubSpot is used by 94,394 companies runsonwhat tracks. ### What email provider does Fieldguide use? Fieldguide uses Google Workspace for email and office software, according to runsonwhat (October 2026). runsonwhat found Google Workspace through email records that authorize Google Workspace. Google Workspace is used by 403,908 companies runsonwhat tracks. ### What is Fieldguide's website built with? Fieldguide uses HubSpot CMS for its website, according to runsonwhat (October 2026). runsonwhat found HubSpot CMS through a subdomain that points at HubSpot CMS. HubSpot CMS is used by 33,334 companies runsonwhat tracks. ### What does Fieldguide use for login and identity? Fieldguide uses Auth0 for sign-in and identity, according to runsonwhat (October 2026). runsonwhat found Auth0 through a subdomain that points at Auth0. Auth0 is used by 5,747 companies runsonwhat tracks. ### What monitoring tools does Fieldguide use? Fieldguide uses Better Stack for monitoring, according to runsonwhat (October 2026). runsonwhat found Better Stack through a subdomain that points at Better Stack. Better Stack is used by 2,667 companies runsonwhat tracks. ### Does Fieldguide use Cloudflare? Yes. runsonwhat found Cloudflare at Fieldguide through a DNS verification record for Cloudflare and DNS records. Cloudflare is a CDN & Edge tool used by 705,887 companies runsonwhat tracks. ### Does Fieldguide use AI tools? Yes. runsonwhat has found Anthropic and OpenAI at Fieldguide; Anthropic, for example, through a DNS verification record for Anthropic. AI services called only from servers leave no public trace, so Fieldguide may use more AI tools than these. ### Which companies have a tech stack similar to Fieldguide's? The companies with the stacks most like Fieldguide's are Zoo, Stardex, ShiftUp and Modal, according to runsonwhat (October 2026). Each shares 7 to 9 tools with Fieldguide, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what Fieldguide uses? runsonwhat reads public records only. Of the 21 tools at Fieldguide, 14 were found through DNS records, 4 through subdomains that point at the vendor and 3 through email records. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and fieldguide.io about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/fieldguide.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.