Cal.com alternative that also runs the project inbox
Cal.com gives your project a booking link. Publish a meeting type in Kontacts and you get that booking link with the mailbox behind it — so when someone replies to the confirmation, the reply lands in the project's inbox instead of nowhere.
One project. One address. One booking page. Mail to the addresses on your list opens a GitHub issue in your repo. Free to start.
How Kontacts compares to Cal.com
| Feature | Kontacts | Cal.com |
|---|---|---|
| Booking page for a project, not a person | Yes — one link for the whole project | Event types belong to a user; shared team availability is a paid Teams feature [1] |
| Billed per seat | No — billed per organisation, not per seat | Yes — Teams is $12 per user/month billed annually, Organizations $28 [1] |
| A real inbox behind the booking link | Yes — project inbox on your own domain | Not offered [1] |
| Receive email on your own domain (MX/SPF/DKIM) | Yes | Not offered [1] |
| Authenticated mail to a listed address opens a GitHub issue | Yes, when routing is on | Not offered [1] |
| Reply posted back as a comment on the issue | Yes — from the inbox, posted as a comment on the linked issue | Not offered [1] |
| GitHub App scoped to repositories you pick | Yes, including private repos | Not offered [1] |
| Mail and meetings on one surface | Yes | Scheduling only [1] |
| What the free tier gets you | The whole product on the free tier — booking page and project inbox on your own domain | 1 user, unlimited event types, 100+ integrations — scheduling only [1] |
| Self-hostable | No — hosted only | Yes — open-source community edition with self-hosting docs [2] |
Sources
- [1] https://cal.com/pricing — read . Free ($0, 1 user, unlimited event types, 100+ integrations); Teams $12 per user/month billed yearly; Organizations $28 per user/month billed yearly; Enterprise custom. No email inbox, email receiving or GitHub issue creation appears on the pricing page.
- [2] https://cal.diy/installation — read . "Cal.diy is the open source community edition of Cal.com", with self-hosting deployment instructions.
Cal.com vs Kontacts: what each one actually owns
Cal.com is a scheduling product and a very good one. It owns the calendar: availability, event types, routing forms, a large integration catalogue. What it does not own is what happens in the thread around the meeting. The confirmation goes out, the person replies with “can we make it 3pm, and here's the bug I mentioned” — and that reply goes to whatever personal mailbox is attached to the account, where it is one message among four hundred.
Kontacts starts from the other end. The project has an address on its own domain. Mail to that address lands in the project's inbox. With routing on, the addresses you put on your list also open a GitHub issue in the repo you connected. The booking page is part of the same project — same hours, same team, same inbox. The meeting and the conversation about the meeting live in one place.
Cal.com pricing vs Kontacts pricing
Cal.com's free tier covers one user with unlimited event types. The moment you want a second person on shared availability you are on Teams at $12 per user/month billed annually; Organizations is $28 per user/month billed annually (source [1], read 2026-08-18).
Kontacts is billed per organisation, not per seat. Prices live on the pricing page rather than here. What the free plan buys is a different shape — not a cheaper scheduling tool, but the booking page and the project's inbox on your own domain, from one product.
Why the thread matters more than the booking
A booking is one event. The thread is the relationship. If you are running an open-source project or a small team using GitHub as your helpdesk, the valuable artefact is not “meeting scheduled” — it is the issue that the meeting was about, with the original email in it, in the repo, where the work happens.
That is the whole difference. Cal.com hands you a confirmed slot. Kontacts hands you a confirmed slot and issue #42.
When Cal.com is the better choice
If scheduling is the job, use Cal.com. It is a deeper scheduling product than ours and we are not going to pretend otherwise: routing forms, round-robin and collective event types, 100+ integrations, a mobile app and a browser extension (source [1]). If you need to self-host, cal.com publishes an open-source community edition with self-hosting instructions (source [2]) and we do not — Kontacts is hosted only. And if your team has no GitHub repo behind it, our best feature is one you will never use. Take Cal.com. We would rather you were happy somewhere else than disappointed here.
Questions,
answered short.
- Is Kontacts a drop-in replacement for Cal.com?
- No. Kontacts covers the core of scheduling — a project booking page with team hours, buffers, minimum notice and a booking horizon — but Cal.com has a deeper scheduling feature set including routing forms and round-robin events (cal.com/pricing, read 2026-08-18). Kontacts is the better fit when you want the booking link and the project's inbox to be the same product.
- What does Kontacts do that Cal.com does not?
- It receives email. Point your domain's MX, SPF and DKIM records at Kontacts and the project gets a real inbox; turn routing on and authenticated mail to the addresses on your list opens a GitHub issue in the repository you connected. Cal.com's pricing page lists no email inbox, email receiving or GitHub issue creation (read 2026-08-18).
- How much does Kontacts cost compared to Cal.com?
- Kontacts is billed per organisation, not per seat. Prices live on the pricing page. Cal.com's free plan covers one user; its Teams tier is $12 per user/month billed annually and Organizations is $28 per user/month billed annually (cal.com/pricing, read 2026-08-18).
- Can I self-host Kontacts like Cal.com?
- No. Cal.com publishes an open-source community edition with self-hosting instructions (cal.diy/installation, read 2026-08-18). Kontacts is hosted only. If self-hosting is a requirement, Cal.com is the right choice.
- Does the booking page work without the GitHub integration?
- Yes. The booking page belongs to the project whether or not you connect a repository — booking needs no GitHub connection at all. Turning email into issues is the half that needs GitHub, and the App alone is not enough: it takes a connected repository, issue routing switched on for that domain, and an authenticated message to an address on your list — or to any address at the domain, with the optional catch-all on. Anything else stays in the inbox, marked quarantined.
- Where does a reply to a booking confirmation go?
- Into the project's inbox, if you have pointed a domain at Kontacts. That is the reason this page exists. You can read it there, route it into a GitHub issue, and reply from the inbox — the reply leaves from the project address, and if the thread is linked it is posted as a comment on that issue.