Scheduling and meetings decision
syncdate.app
A single competent developer can build and operate a useful self-hosted replacement for the core calendar-sync functionality; advanced polish, team features, and long-term operations are the main reasons some users will still pay.
Visit website↗$7.42/mo
$89/yr
Read off the official pricing page.
$100one-off42 h to build
$40/mo6 h/mo upkeep
On cash alone, building overtakes the subscription at 7 seats.
No open-source build does this yet
Nothing published replaces this one, so a replacement starts from an empty file. Here is what it would have to cover.
What a replacement has to do
- Continuously detect changes in connected calendars, map and transform events (privacy masking), and write corresponding events to destination calendars so availability stays synchronized.
What it still won’t have
- Polished multi-provider UI/UX and polished calendar views
- Priority support and SLA-backed team features
- Edge-case scaling, monitoring, and operational experience around OAuth/webhook reliability
- MCP server for AI-agent integrations (unless implemented separately)
What remains hard
- Compliance and regulation
Hosted in Germany (EU), GDPR compliant.
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 7 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a minimal calendar-sync service in Node.js + Postgres, hosted on a single Hetzner VPS. Core features: OAuth sign-in for Google and Microsoft, CalDAV/iCal credential ingestion and polling, webhook receiver with polling fallback, a background worker that diffs source/destination events and applies mapped changes (respect recurrence rules), per-sync privacy rules (Busy/default/custom title, exclude by title/all-day), DB tables for accounts/syncs/event mappings, and a small React admin dashboard to create/pause/delete syncs and view sync health. Explicitly out of scope: a fancy unified calendar UI, team billing, and MCP/AI transport. Include encrypted token storage (AES-256-GCM), retry/error handling, tests for webhook and mapping logic, and deployment/run scripts.
How we checked
How the score was reached
- Partly verdict base52
- 3 cited sources+3
- Price verified on pricing page+3
- 3/3 assessment runs agreed+4
- Hard moats found in the evidence-3
- Evidence score59
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time - so the same evidence always produces the same number.
How scoring works →Cited sources · 3
Every page the run actually retrieved.
Integrity checks
What held up, and what did not.
