head to head · open source
espectre vs calendar-card-pro
espectre has 9,687 GitHub stars, 736 forks, 13 open issues and last shipped 3 days ago. calendar-card-pro has 1,231 stars, 103 forks, 51 open issues and last shipped 2 days ago. espectre leads on adoption by 687% (9,687 vs 1,231 stars). espectre is written in Python under GPL-3.0; calendar-card-pro is written in TypeScript under MIT. espectre has attracted 8% as many forks as stars, calendar-card-pro 8%. calendar-card-pro was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (home-assistant), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| espectre | calendar-card-pro | |
|---|---|---|
| GitHub stars | ★ 9.7K | ★ 1.2K |
| License | GPL-3.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-10-24 | 2026-10-25 |
| Forks | ⑂ 736 | ⑂ 103 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick espectre if
- You weight community size — 9.7K stars and counting
- You want the GPL-3.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick calendar-card-pro if
- You want the calendar-card-pro feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and calendar-card-pro fits your workflow better
About espectre
ESPectre Turn an ESP32 into a private, local Wi Fi motion sensor. When someone moves through a room, they change the way Wi Fi signals travel through it. ESPectre reads those changes and reports motion in real time. No camera, no microphone, no wearable, and no dedicated radar hardware: just a supported ESP32 and the Wi Fi network already in the room. ESPectre is an open source platform that brings together ready to flash firmware, an embeddable C++ SDK, a MicroPython implementation, browser tools, a host CLI, an open dataset, open model weights, and the research workflow used to build and validate the…
read the full espectre overview →
About calendar-card-pro
Calendar Card Pro for Home Assistant [![hacs][hacs img]][hacs url] [![GitHub Release][github release img]][github release url] [![Downloads][github downloads img]][github release url] [![Downloads@latest][github latest downloads img]][github release url] ☕ Support This Project If you find Calendar Card Pro useful, consider supporting its development: 📖 Documentation This README covers installation and a quick start. Everything else — every configuration option, all features and worked examples — lives on the documentation site , which is searchable and always matches the latest release. 1️⃣ Overview 🔍 About…
read the full calendar-card-pro overview →
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Frequently asked questions
Is espectre or calendar-card-pro more popular?
espectre has 9,687 GitHub stars and calendar-card-pro has 1,231. espectre has the larger community by that measure.
Are espectre and calendar-card-pro free?
Both are open source. espectre is licensed under GPL-3.0 and calendar-card-pro under MIT. Neither carries a licence fee.
What is the difference between espectre and calendar-card-pro?
espectre is written in Python and calendar-card-pro in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, espectre or calendar-card-pro?
Choose espectre if you want the larger community (9,687 stars) or its GPL-3.0 licence terms. Choose calendar-card-pro if its feature set, stack or MIT licence fits better. Both are self-hostable.