Alternatives
Products that do what KoalaSync does
Sync Netflix, Emby & more perfectly. Free & open-source.
- 1BP
Hi HN! I made Beatsync, an open-source browser-based audio player that syncs audio with millisecond-level accuracy across many devices. Try it live right now: https://www.beatsync.gg/ The idea is that with no additional hardware, you can turn any group of devices into a full surround sound system. MacBook speakers are particularly good. Inspired by Network Time Protocol (NTP), I do clock synchronization over websockets and use the Web Audio API to keep audio latency under a few ms. You can also drag devices around a virtual grid to simulate spatial audio — it changes the…
2025 · github.com
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- 3BD
Hi HN, Today we’re launching PowerSync, a Postgres<>SQLite bi-directional sync engine that enables an offline-first app architecture. It currently supports Flutter, React Native and web (JavaScript) using Wasm SQLite in the browser, with more client SDKs on the way. Conrad and I (Ralf) have been working on our sync engine since 2009, originally as part of a full-stack app platform. That version of the system is still used in production worldwide and we’ve learnt a lot from its use cases and scaling. About a year ago we started on spinning off PowerSync as a standalone product that is…
2023 · powersync.com
- 4DA
Hey HN! I’ve written a bunch of WebSocket servers over the years to do simple things like state synchronization, WebRTC signaling, and notifying a client when a backend job was run. I realized that if I had a simple way to create a private, temporary, mini-redis that the client could talk to directly, it would save a lot of time. So we created DriftDB. In addition to the open source server that you can run yourself, we also provide https://jamsocket.live where you can use an instance we host on Cloudflare’s edge (~13ms round trip latency from my home in NY). You may have seen my…
2023 · driftdb.com
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- 11SSSignage Sync▲11
Hi guys, I'm sharing something I've been tinkering on for a while: https://signagesync.app/ Like Google Chromecast, but "cast" to multiple screens at once. Create a playlist of auto-refreshing web pages, videos, and even live streams (but not supported on Windows). Also works with local network, e.g. http://192.168.../sales-dashboard It's still early (MVP), but already usable—and I'd love to hear your feedback. Tech stack: SvelteKit, WebSocket, Flutter (desktop)
Sep 2025 · signagesync.app
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- 18OS
2016 · oddnetworks.com
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2019 · github.com
- 21OR
Got into a rabbit hole today. POC works using 'npx efficient-recorder'. Is this useful to anyone?
2025 · github.com
- 22KO
2014 · kickflip.io
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2017 · etesync.com
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