Head to head
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Up to 4 tools, same rows for each: what it is, what it really costs, the trap, and how to wire it up. The URL carries your picks — send it to anyone.
Supabase RealtimeGiscusPartyKit
Quick read
- Free with no card: Giscus, PartyKit.
| Field | Supabase Realtimesupabase.com | Giscusgiscus.app | PartyKitpartykit.io |
|---|---|---|---|
| What it is | The realtime layer bundled with Supabase, offering three modes: Broadcast for ephemeral pub/sub, Presence for who-is-online state, and Postgres Changes for streaming row-level inserts, updates and deletes directly off the database write-ahead log. Row Level Security policies govern the realtime stream as well as the table. | Comment widget that stores each thread as a GitHub Discussion. You install the giscus app, enable Discussions on a public repo, and a script tag maps each page to a discussion by pathname, URL or og:title. Supports threaded replies, reactions, themes and lazy loading, with no database of your own. | Open-source framework for stateful realtime servers built on Cloudflare Durable Objects. Each 'party' is a server-side class owning a room of WebSocket clients, so presence, chat, cursors and Yjs sync take a few dozen lines. PartyKit announced it was joining Cloudflare in April 2024. |
| Category | Realtime, comments & collab | Realtime, comments & collab | Realtime, comments & collab |
| Cost tier | mixed | free | free |
| Pricing | Free: 200 concurrent peak connections, 2M messages/mo, 256 KB max message size. Pro $25/mo: 500 connections then $10 per 1,000, 5M messages then $2.50 per million, 3 MB messages. Team $599/mo. Self-hostable | Free forever and open source. No hosting cost, no database, no accounts to administer — every thread is stored as a GitHub Discussion in a repository you already own | Individual free: deploy to PartyKit cloud, up to 10 live projects, room storage cleared every 24 hours. Commercial free: deploy to your own Cloudflare account with unlimited projects and custom domains, paying only Cloudflare Workers and Durable Objects usage |
| Why builders pick it | If your content already lives in Supabase Postgres, live comments cost one postgres_changes subscription and no extra vendor. The same RLS policy that protects the table protects the socket, which removes a whole class of auth bugs. | Zero infrastructure, zero cost, zero moderation queue — GitHub handles authentication, spam and abuse reporting for you. For a developer-audience project or a docs site it is the default answer and takes about ten minutes. | You want a multiplayer backend without operating one. npx partykit dev gives a local room server in seconds, and deploying to your own Cloudflare account keeps the bill at raw Workers prices instead of a per-message meter. |
| Watch out for | Postgres Changes does not scale like dedicated pub/sub — Supabase itself steers high-throughput use toward Broadcast, since every change is authorised and filtered per connection. Limits are on peak concurrent connections, so one spike bills even when average usage is tiny. | Commenters need a GitHub account and must authorise the app, which excludes almost all non-technical readers — usually disqualifying for a general-audience project. The repository must be public, so every comment is public too. | Since the Cloudflare acquisition, momentum has shifted toward Cloudflare's own Durable Objects and Agents SDK — treat PartyKit as a convenience layer that may fold into the platform. Free-tier room storage is wiped every 24 hours, so it is not durable. |
| How to wire it up | npm i @supabase/supabase-js | Paste the generated script tag from giscus.app/#configuration | npm create partykit@latest |
| Editor's pick | No | No | No |
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# Tool comparison — Supabase Realtime vs Giscus vs PartyKit Source: Kbaise, a directory of tools that work with Lovable projects. Pick one and tell me why before writing any integration code. ## Supabase Realtime (supabase-realtime) - URL: https://supabase.com/realtime - Category: Realtime, comments & collab - Cost: mixed — Free: 200 concurrent peak connections, 2M messages/mo, 256 KB max message size. Pro $25/mo: 500 connections then $10 per 1,000, 5M messages then $2.50 per million, 3 MB messages. Team $599/mo. Self-hostable - What it is: The realtime layer bundled with Supabase, offering three modes: Broadcast for ephemeral pub/sub, Presence for who-is-online state, and Postgres Changes for streaming row-level inserts, updates and deletes directly off the database write-ahead log. Row Level Security policies govern the realtime stream as well as the table. - Why builders pick it: If your content already lives in Supabase Postgres, live comments cost one postgres_changes subscription and no extra vendor. The same RLS policy that protects the table protects the socket, which removes a whole class of auth bugs. - Trap: Postgres Changes does not scale like dedicated pub/sub — Supabase itself steers high-throughput use toward Broadcast, since every change is authorised and filtered per connection. Limits are on peak concurrent connections, so one spike bills even when average usage is tiny. - Wiring: npm i @supabase/supabase-js - Full dossier: /api/public/tools/supabase-realtime ## Giscus (giscus) - URL: https://giscus.app - Category: Realtime, comments & collab - Cost: free — Free forever and open source. No hosting cost, no database, no accounts to administer — every thread is stored as a GitHub Discussion in a repository you already own - What it is: Comment widget that stores each thread as a GitHub Discussion. You install the giscus app, enable Discussions on a public repo, and a script tag maps each page to a discussion by pathname, URL or og:title. Supports threaded replies, reactions, themes and lazy loading, with no database of your own. - Why builders pick it: Zero infrastructure, zero cost, zero moderation queue — GitHub handles authentication, spam and abuse reporting for you. For a developer-audience project or a docs site it is the default answer and takes about ten minutes. - Trap: Commenters need a GitHub account and must authorise the app, which excludes almost all non-technical readers — usually disqualifying for a general-audience project. The repository must be public, so every comment is public too. - Wiring: Paste the generated script tag from giscus.app/#configuration - Full dossier: /api/public/tools/giscus ## PartyKit (partykit) - URL: https://www.partykit.io - Category: Realtime, comments & collab - Cost: free — Individual free: deploy to PartyKit cloud, up to 10 live projects, room storage cleared every 24 hours. Commercial free: deploy to your own Cloudflare account with unlimited projects and custom domains, paying only Cloudflare Workers and Durable Objects usage - What it is: Open-source framework for stateful realtime servers built on Cloudflare Durable Objects. Each 'party' is a server-side class owning a room of WebSocket clients, so presence, chat, cursors and Yjs sync take a few dozen lines. PartyKit announced it was joining Cloudflare in April 2024. - Why builders pick it: You want a multiplayer backend without operating one. npx partykit dev gives a local room server in seconds, and deploying to your own Cloudflare account keeps the bill at raw Workers prices instead of a per-message meter. - Trap: Since the Cloudflare acquisition, momentum has shifted toward Cloudflare's own Durable Objects and Agents SDK — treat PartyKit as a convenience layer that may fold into the platform. Free-tier room storage is wiped every 24 hours, so it is not durable. - Wiring: npm create partykit@latest - Full dossier: /api/public/tools/partykit ## Quick read - Free with no card: Giscus, PartyKit. ## Rules 1. Prefer the free tier when no budget was stated, and say what the ceiling is. 2. Read the full dossier before integrating. 3. Fetch /api/public/models before writing any AI model ID.
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