Live in production · Built solo

The agentic back-office that recovers the revenue clinics don't know they're losing.

Ran-Tevu turns the missed call, the no-show and the forgotten patient into recovered euros — with the clinic owner approving every single move.

In production: www.ran-tevu.gr Voice + chat · Greek-native Built by one founder, 19
The insight

Booking AI is a commodity. The money is in what happens after.

Everyone automates the call that comes in. Almost no one touches the money that leaks out — the no-show nobody re-books, the patient overdue for a recall nobody phones, the after-hours call nobody returns.

15–30%
of bookable revenue lost to no-shows & missed follow-ups
€1k–5k
leaking every month from a single high-ticket clinic
0
front-desk hours available to chase any of it

Figures are typical ranges for appointment-based healthcare clinics; the exact number is computed live per clinic from its own data.

The system

A closed loop — not a chatbot.

Ran-Tevu reads a clinic's own data, finds the leak, and proposes the fix. A human approves. The euro comes back. The dashboard keeps score.

1
🔍
Detect
Reads bookings, no-shows, recall windows & missed calls
2
🧠
Propose
Drafts the recovery action + the € at stake
3
Approve
Owner taps yes — nothing auto-sends (GR Law 3471/2006)
4
📞
Recover
Re-books, recalls, calls back — voice + chat, in Greek
5
📈
Ledger
Every recovered euro shown on a dashboard
The approval step is the product, not a limitation. Compliance is built into the loop where blunt auto-messaging is illegal.
Why it compounds

Defensible where a generic voice bot is not.

Compliance is the moat

Propose→approve keeps it legal in the EU, where auto-blasting patients is not. The funded "AI receptionist" players ignore this layer.

The ledger is switching-cost

Each clinic's recovered-revenue history lives in Ran-Tevu. The longer it runs, the more it knows — and the harder it is to leave.

One leak, every market

Greek high-ticket clinics first. The exact same revenue leak exists across physio, dental and aesthetics throughout the EU.

Proof

Not a deck. A system that runs today.

Shipped

Live, multi-tenant, in production at www.ran-tevu.gr — end-to-end booking working now.

Full stack, solo

Voice (Vapi), payments (Stripe), the agentic layer and the dashboard — all built by one person.

Velocity

From idea to production system, shipping daily, as a 19-year-old student.

Honest status: pre-revenue by design. The product is built; the next milestone is the first paid design-partner clinic — this month.

The founder
Δ

Dinos Gkiou — 19

Economics, University of Crete. Built the entire Ran-Tevu stack alone and ships every day. Looking for the right people to build the next part with.

The ask

15 minutes of your read — and one intro.

Your honest take on the wedge, and — if it fits — an intro to one physio or dental clinic willing to be a design partner. That is the single thing that moves this forward right now.

See it live → www.ran-tevu.gr
Ran-Tevu · Athens / Crete · www.ran-tevu.gr · Dinos Gkiou
Confidential — shared for evaluation only, not for redistribution. © 2026 Konstantinos Gkioulbaxiotis. All rights reserved.