Appointment & Slot Booking App
Effortless slot reservation, upfront deposits, calendar sync, and zero no-shows.
Empty chairs and forgotten appointments cost service businesses tens of thousands every month. Automate scheduling, staff assignments, calendar synchronization, and automated WhatsApp reminder alerts.
Who is the audience?
- Clients & Patients: People booking appointments who want transparent slot availability, upfront pricing, and calendar invites.
- Solo Practitioners & Specialists: Doctors, lawyers, tutors, consultants, and therapists managing their private client schedules.
- Receptionists & Front-Desk Staff: Team members who handle walk-ins, reschedule cancellations, and collect balances.
Screens involved
- Service & Specialist Directory: Filter services by duration, price, and practitioner profile. (Elements: Category filter pills (Consultation, Follow-up, Therapy), Practitioner cards with ratings, photo, and bio, Clear service duration and fee displays, "Check Earliest Available Slot" badge)
- Interactive Calendar & Slot Picker: Live date and time grid highlighting free, booked, and rush slots. (Elements: Month & week view horizontal date strip, Morning, Afternoon, Evening slot cards, Buffer time and lunch break auto-blocking, Timezone indicator for virtual consultations)
- Deposit & Booking Confirmation: Collect token advance or full fee with instant calendar invite generation. (Elements: Client intake questions (Symptoms, notes, files), Deposit amount breakdown, UPI / Card payment options, Add to Google / Apple Calendar button)
- Staff Schedule & Client Queue: Daily timeline view for service providers to manage their appointments. (Elements: Chronological day schedule with client tags, Mark "Client Arrived" or "Completed" toggles, Direct WhatsApp message button to client, Reschedule / cancel with automated refund rules)
User journey flow
flowchart TD
A["Customer Selects Service & Specialist"] --> B["Selects Available Date & Time Slot"]
B --> C["Fills Intake Questionnaire"]
C --> D["Pays Deposit / Full Fee via UPI"]
D --> E["Instant Slot Lock & Booking Confirmation"]
E --> F["Google / Apple Calendar Event Added"]
F --> G["Automated WhatsApp Reminder 24h & 2h Before"]
G --> H["Appointment Completed & Follow-up Triggered"]System architecture
flowchart LR
App["Client & Staff Mobile App"] --> Server["Booking API Engine"]
Server --> CalSync["Google / Outlook Calendar Sync"]
Server --> SlotEngine["Slot Lock & Concurrency Manager"]
SlotEngine --> Redis[("Redis Slot Mutex")]
Server --> NotifSvc["WhatsApp & SMS Reminder Service"]
Server --> DB[("PostgreSQL Bookings DB")]
Server --> Gateway["UPI Payment Gateway"]Key features
- Zero double-booking guarantee with sub-second slot locking
- Automated 2-way sync with Google Calendar and Microsoft Outlook
- Mandatory advance deposits to cut no-show rates to under 3%
- Custom intake forms with image and medical document attachments
- Automated WhatsApp reminders with one-click confirm or reschedule links
Admin capabilities
- Staff working hours, holidays, and buffer time configuration
- Real-time appointment ledger with revenue and cancellation statistics
- Client history log with previous notes and payment records
- Configurable refund and cancellation fee policies