What AI assistants actually recommend when buyers ask about self-hosted scheduling and booking tools — measured weekly across 4 engines, published as open data.
Updated 2026-08-02 · 56 sampled answers · rolling 4-week window · methodology
Rankings are measured from sampled AI answers — never editorial, never paid. Orbator builds AI-visibility tooling; when Orbator itself appears in any category, it is measured by the same rules as everyone else.
Sample: 56 AI answers · Window: Jul 5, 2026 – Aug 2, 2026 (4-week rolling) · trend vs prior 4 weeks (32 answers)
Across 56 sampled AI answers from 4 engines, Cal.com is recommended most often — appearing in 78.6% of recommendations, followed by Easy!Appointments (69.6%) and Calendly (37.5%).
This is a measurement of share of voice across 4 AI engines — not an editorial pick. See the full ranking below.
| # | Product | Share | Trend | Engines | |
|---|---|---|---|---|---|
| 1 | Cal.com cal.com Best for: AI recommends Cal.com most when buyers ask “best open-source appointment booking software I can run on my own server” (100% of those answers) | 78.6% 95% CI 66.2–87.3% 44 mentions · avg pos 4.1 first pick 47.7% | — | GEMINI 66.7%CHATGPT 100%CLAUDE 71.4%PERPLEXITY 85.7% | Claim |
| 2 | Easy!Appointments easyappointments.org Best for: AI recommends Easy!Appointments most when buyers ask “best open-source appointment booking software I can run on my own server” (100% of those answers) | 69.6% 95% CI 56.7–80.1% 39 mentions · avg pos 5 first pick 15.4% | — | GEMINI 52.4%CHATGPT 100%CLAUDE 57.1%PERPLEXITY 81% | Claim |
| 3 | Calendly calendly.com Best for: AI recommends Calendly most when buyers ask “open-source scheduling alternatives to popular hosted booking link platforms” (87.5% of those answers) | 37.5% 95% CI 26–50.6% 21 mentions · avg pos 6.9 first pick 23.8% | — | GEMINI 33.3%CHATGPT 71.4%CLAUDE 28.6%PERPLEXITY 33.3% | Claim |
| 4 | Docker docker.com Best for: AI recommends Docker most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (100% of those answers) | 35.7% 95% CI 24.5–48.8% 20 mentions · avg pos 3.1 first pick 20% | — | GEMINI 28.6%CHATGPT 42.9%CLAUDE 28.6%PERPLEXITY 42.9% | Claim |
| 5 | LibreBooking Best for: AI recommends LibreBooking most when buyers ask “what open-source booking tool should I use for a multi-staff service business with resource management” (100% of those answers) | 32.1% 95% CI 21.4–45.2% 18 mentions · avg pos 3.5 first pick 22.2% | — | GEMINI 42.9%CHATGPT 14.3%CLAUDE 28.6%PERPLEXITY 28.6% | Claim |
| 6 | Cal.diy Best for: AI recommends Cal.diy most when buyers ask “best open-source appointment booking software I can run on my own server” (62.5% of those answers) | 32.1% 95% CI 21.4–45.2% 18 mentions · avg pos 5.4 first pick 33.3% | — | GEMINI 52.4%CHATGPT 28.6%PERPLEXITY 23.8% | Claim |
| 7 | MySQL mysql.com Best for: AI recommends MySQL most when buyers ask “best open-source appointment booking software I can run on my own server” (50% of those answers) | 25% 95% CI 15.5–37.7% 14 mentions · avg pos 5.9 first pick 14.3% | — | GEMINI 23.8%CHATGPT 28.6%CLAUDE 14.3%PERPLEXITY 28.6% | Claim |
| 8 | Google Calendar calendar.google.com Best for: AI recommends Google Calendar most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (62.5% of those answers) | 21.4% 95% CI 12.7–33.8% 12 mentions · avg pos 4.4 first pick 25% | — | GEMINI 14.3%CHATGPT 71.4%CLAUDE 14.3%PERPLEXITY 14.3% | Claim |
| 9 | Rallly Best for: AI recommends Rallly most when buyers ask “open-source scheduling alternatives to popular hosted booking link platforms” (87.5% of those answers) | 21.4% 95% CI 12.7–33.8% 12 mentions · avg pos 5.8 first pick 0% | — | GEMINI 28.6%CHATGPT 14.3%CLAUDE 28.6%PERPLEXITY 14.3% | Claim |
| 10 | NGINX nginx.org Best for: AI recommends NGINX most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (87.5% of those answers) | 21.4% 95% CI 12.7–33.8% 12 mentions · avg pos 9.7 first pick 8.3% | — | GEMINI 23.8%CHATGPT 42.9%CLAUDE 14.3%PERPLEXITY 14.3% | Claim |
| 11 | Booked Scheduler Best for: AI recommends Booked Scheduler most when buyers ask “open-source scheduling alternatives to popular hosted booking link platforms” (62.5% of those answers) | 19.6% 95% CI 11.3–31.8% 11 mentions · avg pos 4.7 first pick 27.3% | — | GEMINI 23.8%CHATGPT 28.6%CLAUDE 14.3%PERPLEXITY 14.3% | Claim |
| 12 | Outlook outlook.com Best for: AI recommends Outlook most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (100% of those answers) | 19.6% 95% CI 11.3–31.8% 11 mentions · avg pos 4.9 first pick 9.1% | — | GEMINI 19%CHATGPT 42.9%CLAUDE 14.3%PERPLEXITY 14.3% | Claim |
| 13 | Doodle doodle.com Best for: AI recommends Doodle most when buyers ask “open-source scheduling alternatives to popular hosted booking link platforms” (87.5% of those answers) | 16.1% 95% CI 8.7–27.8% 9 mentions · avg pos 5.1 first pick 0% | — | GEMINI 14.3%CHATGPT 14.3%CLAUDE 28.6%PERPLEXITY 14.3% | Claim |
| 14 | Nextcloud nextcloud.com Best for: AI recommends Nextcloud most when buyers ask “best self-hosted scheduling tool for a consultant who doesn't want calendar data in the cloud” (37.5% of those answers) | 16.1% 95% CI 8.7–27.8% 9 mentions · avg pos 9.1 first pick 0% | — | GEMINI 23.8%CHATGPT 42.9%PERPLEXITY 4.8% | Claim |
| 15 | PostgreSQL postgresql.org Best for: AI recommends PostgreSQL most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (62.5% of those answers) | 16.1% 95% CI 8.7–27.8% 9 mentions · avg pos 9.4 first pick 22.2% | — | GEMINI 23.8%CHATGPT 42.9%CLAUDE 14.3% | Claim |
| 16 | Nextcloud Calendar Best for: AI recommends Nextcloud Calendar most when buyers ask “best self-hosted scheduling tool for a consultant who doesn't want calendar data in the cloud” (37.5% of those answers) | 14.3% 95% CI 7.4–25.7% 8 mentions · avg pos 10.9 first pick 0% | — | GEMINI 23.8%CHATGPT 28.6%PERPLEXITY 4.8% | Claim |
| 17 | OpenEMR openemr.org Best for: AI recommends OpenEMR most when buyers ask “self-hosted scheduling tool for a healthcare clinic that needs patient data on-premise” (75% of those answers) | 12.5% 95% CI 6.2–23.6% 7 mentions · avg pos 3.6 first pick 14.3% | — | GEMINI 14.3%CHATGPT 14.3%PERPLEXITY 14.3% | Claim |
| 18 | TimeTrex timetrex.com Best for: AI recommends TimeTrex most when buyers ask “open-source scheduling alternatives to popular hosted booking link platforms” (37.5% of those answers) | 12.5% 95% CI 6.2–23.6% 7 mentions · avg pos 4 first pick 0% | — | GEMINI 14.3%PERPLEXITY 19% | Claim |
| 19 | Apache Hop apache.org Best for: AI recommends Apache Hop most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (37.5% of those answers) | 8.9% 95% CI 3.9–19.3% 5 mentions · avg pos 5.7 first pick 20% | — | GEMINI 14.3%PERPLEXITY 9.5% | Claim |
| 20 | Caddy caddyserver.com Best for: AI recommends Caddy most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (50% of those answers) | 8.9% 95% CI 3.9–19.3% 5 mentions · avg pos 13.8 first pick 0% | — | GEMINI 4.8%CHATGPT 28.6%CLAUDE 14.3%PERPLEXITY 4.8% | Claim |
| 21 | WordPress wordpress.com | 8.9% 95% CI 3.9–19.3% 5 mentions · avg pos 14.2 first pick 0% | — | CHATGPT 14.3%CLAUDE 28.6%PERPLEXITY 9.5% | Claim |
| 22 | TimeTrex Community Edition Best for: AI recommends TimeTrex Community Edition most when buyers ask “what open-source booking tool should I use for a multi-staff service business with resource management” (37.5% of those answers) | 7.1% 95% CI 2.8–17% 4 mentions · avg pos 2.8 first pick 0% | — | GEMINI 14.3%PERPLEXITY 4.8% | Claim |
| 23 | Jitsi jitsi.org Best for: AI recommends Jitsi most when buyers ask “self-hosted scheduling tool for a healthcare clinic that needs patient data on-premise” (37.5% of those answers) | 7.1% 95% CI 2.8–17% 4 mentions · avg pos 4 first pick 75% | — | GEMINI 14.3%CHATGPT 14.3% | Claim |
| 24 | Jitsi Meet jitsi.support Best for: AI recommends Jitsi Meet most when buyers ask “self-hosted scheduling tool for a healthcare clinic that needs patient data on-premise” (37.5% of those answers) | 7.1% 95% CI 2.8–17% 4 mentions · avg pos 5.5 first pick 75% | — | GEMINI 14.3%CHATGPT 14.3% | Claim |
| 25 | Google Cloud Console console.cloud.google.com Best for: AI recommends Google Cloud Console most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (50% of those answers) | 7.1% 95% CI 2.8–17% 4 mentions · avg pos 10.8 first pick 0% | — | GEMINI 9.5%CLAUDE 14.3%PERPLEXITY 4.8% | Claim |
| 26 | Let's Encrypt letsencrypt.org Best for: AI recommends Let's Encrypt most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (50% of those answers) | 7.1% 95% CI 2.8–17% 4 mentions · avg pos 11.5 first pick 0% | — | GEMINI 9.5%CHATGPT 14.3%CLAUDE 14.3% | Claim |
| 27 | Traefik traefik.io Best for: AI recommends Traefik most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (37.5% of those answers) | 7.1% 95% CI 2.8–17% 4 mentions · avg pos 13 first pick 0% | — | CHATGPT 28.6%CLAUDE 14.3%PERPLEXITY 4.8% | Claim |
| 28 | OpenCare Best for: AI recommends OpenCare most when buyers ask “self-hosted scheduling tool for a healthcare clinic that needs patient data on-premise” (37.5% of those answers) | 5.4% 95% CI 1.8–14.6% 3 mentions · avg pos 1 first pick 100% | — | GEMINI 14.3% | Claim |
| 29 | Node.js nodejs.org | 5.4% 95% CI 1.8–14.6% 3 mentions · avg pos 1.3 first pick 66.7% | — | GEMINI 9.5%CLAUDE 14.3% | Claim |
| 30 | Ottehr ottehr.com Best for: AI recommends Ottehr most when buyers ask “self-hosted scheduling tool for a healthcare clinic that needs patient data on-premise” (37.5% of those answers) | 5.4% 95% CI 1.8–14.6% 3 mentions · avg pos 3.7 first pick 0% | — | GEMINI 14.3% | Claim |
| 31 | Bookafy | 5.4% 95% CI 1.8–14.6% 3 mentions · avg pos 4 first pick 0% | — | GEMINI 9.5%PERPLEXITY 4.8% | Claim |
| 32 | Microsoft 365 Best for: AI recommends Microsoft 365 most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (37.5% of those answers) | 5.4% 95% CI 1.8–14.6% 3 mentions · avg pos 13.5 first pick 0% | — | CHATGPT 14.3%PERPLEXITY 9.5% | Claim |
| 33 | Tymeslot | 5.4% 95% CI 1.8–14.6% 3 mentions · avg pos 14.7 first pick 0% | — | CHATGPT 28.6%PERPLEXITY 4.8% | Claim |
| 34 | ERPNext erpnext.com | 5.4% 95% CI 1.8–14.6% 3 mentions · avg pos 21.7 first pick 0% | — | GEMINI 4.8%CHATGPT 14.3%PERPLEXITY 4.8% | Claim |
| 35 | SourceForge sourceforge.net Best for: AI recommends SourceForge most when buyers ask “open-source scheduling alternatives to popular hosted booking link platforms” (37.5% of those answers) | 5.4% 95% CI 1.8–14.6% 3 mentions first pick 0% | — | PERPLEXITY 14.3% | Claim |
| 36 | dxcal dxcal.com Best for: AI recommends dxcal most when buyers ask “self-hosted scheduling tool for a healthcare clinic that needs patient data on-premise” (50% of those answers) | 5.4% 95% CI 1.8–14.6% 3 mentions first pick 0% | — | PERPLEXITY 14.3% | Claim |
| 37 | Zapier AI zapier.com | 3.6% 95% CI 1–12.1% 2 mentions · avg pos 1 first pick 50% | — | CLAUDE 14.3%PERPLEXITY 4.8% | Claim |
| 38 | OpenMRS openmrs.org | 3.6% 95% CI 1–12.1% 2 mentions · avg pos 3 first pick 0% | — | GEMINI 9.5% | Claim |
| 39 | Dkron | 3.6% 95% CI 1–12.1% 2 mentions · avg pos 8 first pick 0% | — | PERPLEXITY 9.5% | Claim |
| 40 | Acuity acuityscheduling.com | 3.6% 95% CI 1–12.1% 2 mentions · avg pos 8.5 first pick 0% | — | CHATGPT 28.6% | Claim |
| 41 | SavvyCal | 3.6% 95% CI 1–12.1% 2 mentions · avg pos 16 first pick 0% | — | CHATGPT 14.3%PERPLEXITY 4.8% | Claim |
| 42 | Goodfirms goodfirms.co Best for: AI recommends Goodfirms most when buyers ask “best open-source appointment booking software I can run on my own server” (37.5% of those answers) | 3.6% 95% CI 1–12.1% 2 mentions first pick 0% | — | PERPLEXITY 9.5% | Claim |
| 43 | Calendso | 1.8% 95% CI 0.3–9.4% 1 mentions · avg pos 2 first pick 0% | — | CLAUDE 14.3% | Claim |
| 44 | Lunacal lunacal.ai | 1.8% 95% CI 0.3–9.4% 1 mentions · avg pos 3 first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 45 | NextAppointments nextappointments.net | 1.8% 95% CI 0.3–9.4% 1 mentions · avg pos 3 first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 46 | Apigee cloud.google.com | 1.8% 95% CI 0.3–9.4% 1 mentions · avg pos 5 first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 47 | Microsoft Outlook outlook.microsoft.com | 1.8% 95% CI 0.3–9.4% 1 mentions · avg pos 5 first pick 0% | — | CHATGPT 14.3% | Claim |
| 48 | NGINX Proxy Manager | 1.8% 95% CI 0.3–9.4% 1 mentions · avg pos 5 first pick 0% | — | CLAUDE 14.3% | Claim |
| 49 | NextGen Healthcare EHR | 1.8% 95% CI 0.3–9.4% 1 mentions · avg pos 5 first pick 0% | — | GEMINI 4.8% | Claim |
| 50 | Odoo odoo.com | 1.8% 95% CI 0.3–9.4% 1 mentions · avg pos 6 first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 51 | OpenAlternative openalternative.co | 1.8% 95% CI 0.3–9.4% 1 mentions · avg pos 8 first pick 0% | — | CHATGPT 14.3% | Claim |
| 52 | Baïkal | 1.8% 95% CI 0.3–9.4% 1 mentions · avg pos 9 first pick 0% | — | CHATGPT 14.3% | Claim |
| 53 | Radicale | 1.8% 95% CI 0.3–9.4% 1 mentions · avg pos 9 first pick 0% | — | CHATGPT 14.3% | Claim |
| 54 | MRBS | 1.8% 95% CI 0.3–9.4% 1 mentions · avg pos 19 first pick 0% | — | GEMINI 4.8% | Claim |
| 55 | Agiled agiled.app | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 56 | Contabo contabo.com | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 57 | Dev.to dev.to Best for: AI recommends Dev.to most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (37.5% of those answers) | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 58 | F6S f6s.com Best for: AI recommends F6S most when buyers ask “open-source scheduling alternatives to popular hosted booking link platforms” (37.5% of those answers) | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 59 | Google Workspace workspace.google.com Best for: AI recommends Google Workspace most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (37.5% of those answers) | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | CHATGPT 14.3% | Claim |
| 60 | Koalendar koalendar.com Best for: AI recommends Koalendar most when buyers ask “how do I self-host a meeting scheduling app that syncs with Google or Outlook calendar” (37.5% of those answers) | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 61 | Microsoft microsoft.com | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 62 | OmniMD omnimd.com Best for: AI recommends OmniMD most when buyers ask “self-hosted scheduling tool for a healthcare clinic that needs patient data on-premise” (37.5% of those answers) | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 63 | Plutio plutio.com | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 64 | Postiz postiz.com | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 65 | Prosper AI getprosper.ai Best for: AI recommends Prosper AI most when buyers ask “self-hosted scheduling tool for a healthcare clinic that needs patient data on-premise” (37.5% of those answers) | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 66 | Simply Set simplyset.io Best for: AI recommends Simply Set most when buyers ask “best self-hosted scheduling tool for a consultant who doesn't want calendar data in the cloud” (37.5% of those answers) | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 67 | Softr softr.io | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 68 | The Digital Project Manager thedigitalprojectmanager.com | 1.8% 95% CI 0.3–9.4% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
Reading the numbers: Share is a point estimate on 56 sampled answers, so each row also shows its 95% CI — the Wilson score interval around that share. When two products' intervals overlap, the gap between them isn't statistically meaningful at this sample size. First pick is the share of a product's recommending answers where it was named first, which separates “always mentioned” from “usually the top recommendation”. Full methodology.
Independence: Orbator customers are badged for disclosure. Customer status does not affect prompts, sampling, extraction, or ranking — see the methodology. Your product on this list? Claim it to see the prompts behind your rank and track it weekly.
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