Attributions

Gyde is built on open-source software and a short list of external services. This page names every third-party service the app and its backend call, what each one is for, and the licenses behind the software we depend on.

External services we use

This is the complete list. If a service is not named here, Gyde does not call it.

• Cerebras - hosted large-language-model inference. It powers the copilot inside each plan's group chat and the deeper research answers it writes.
• Tavily - web search and page extraction. It finds real places and events and reads the venue's or organizer's own public web page so the app can show current details and link back to the source.
• Geoapify - geocoding and place autocomplete: turning what you type, and the place names the copilot proposes, into an address and coordinates.
• OpenAI - text embeddings only. Interest tags are embedded once so people with similar interests can be matched. No narration, no descriptions, no text-to-speech.
• Resend - transactional email delivery: sign-in links and the messages you send us through support and reporting.
• Expo push notifications - delivery of the push notifications you opt into, through Expo's service to Apple and Google.
• SURGE - transactional SMS delivery for one-time phone verification codes and introduction alerts to existing Gyde members who explicitly choose text messages. Nonmember invitations are sent from the inviting member's own messaging or mail app.
• Apple - Sign in with Apple, and Apple Maps for map display on iOS.
• Google - Google Sign-In only. Google Places, Google Maps data, and Google Analytics are not used.
• PostHog - product analytics and masked session replay, so we can see where the app is confusing or broken.
• Langfuse - tracing and quality review for the copilot's prompts and responses.
• Server hosting. The backend and its Postgres database run on a third-party server hosting provider.

Where place and event content comes from

Gyde does not maintain an editorial corpus of places. When the copilot suggests somewhere to go, the details come from a web search and from the venue's, organizer's, or group's own public web page - fetched at the time of the suggestion and shown with a link back to that page. Images shown on a card are the images that page publishes about itself (its Open Graph preview image). We do not re-license or redistribute that content; the source site's own terms apply, and every card links out to it.

Sources we no longer use

Earlier versions of Gyde were a location-aware guide built on an ingested open-data corpus. That pipeline has been retired along with the guide, the narration audio, and the walking tours. Gyde no longer ingests or ships data from Overture Maps, Google Places, Wikidata, OpenStreetMap, Wikimedia Commons, OpenTripMap, Nominatim, Ticketmaster, or Eventbrite. Those attributions are kept here only to record that the data was removed rather than silently retained.

Open-source libraries in the mobile app

The Gyde app is built with the libraries below. Each is provided by its authors under its own license; click through for the full text.

• React Native and React - MIT License, © Meta Platforms, Inc. and affiliates.
• Expo SDK (including expo-calendar, expo-contacts, expo-crypto, expo-image-picker, expo-location, expo-maps, expo-notifications, expo-secure-store, expo-sms, expo-updates, and expo-web-browser) - MIT License, © 650 Industries, Inc.
• Map display on iOS is provided through Apple Maps via expo-maps and is subject to Apple's terms. Leaflet (BSD 2-Clause) renders maps on the web build.
• @noble/hashes, React Native Reanimated, React Native Safe Area Context, React Native SVG, React Native Worklets, react-native-qrcode-svg, and react-native-sse - MIT License.
• posthog-react-native - MIT License, © PostHog.
• Fraunces, IBM Plex Sans, and IBM Plex Mono are bundled through @expo-google-fonts. The font files are provided under their respective SIL Open Font License terms.
• TypeScript - Apache License 2.0, © Microsoft Corporation.

Open-source software in the backend

• Go - BSD 3-Clause License, © The Go Authors.
• GORM, pgx, pgvector-go, coder/websocket, golang-jwt, and go-oidc - MIT or Apache 2.0 licenses.
• PostgreSQL and the pgvector extension - both under the PostgreSQL License.

Typefaces on this site

Headings on gydeinfo.com are set in Instrument Serif by Rodrigo Fuenzalida and Jordan Egstad, used under the SIL Open Font License 1.1. The font file is subset and served from our own server, so viewing this site does not send a request to any third party.

Reporting issues with attributed content

If you believe content shown in the app is missing required attribution, violates a license, or should be removed, please contact drewb97@gmail.com and we will address the issue.