AI-assisted rental operations
Run every door like your best one.
DoorStopper is building AI-assisted operating software for property managers and the portfolios they run. It brings leasing, tenant transitions, rent-risk work and owner communication onto one schedule, prepares the next step for the right person, and keeps every decision with your team.
In development. Today, every engagement starts with a free portfolio review and one scoped workflow.
Alder & Stone Property Co.
- 4A · Linden Flats · TurnDecision Assigned to D. Okafor · Sep 14
- 12B · Harbor Row · ExceptionWith provider Assigned to Licensed provider · —
- 3A · Alder Court · ExceptionReturned payment Assigned to M. Alvarez · Overdue 5 d
- 01Beside your PMS
Your PMS stays the system of record for leases and the ledger. No rip-and-replace.
- 02Your team decides
Leasing acts, notices, payment plans and application decisions stay with your licensed team.
- 03Every step assigned
Each turn and each exception is designed to carry a named person, a next step and a date.
- 04Owners kept informed
Updates drafted from the work itself, approved and sent by your team.
The work that decides a property’s year runs between systems.
Illustrative. Every company’s map is different; the portfolio review draws yours.
| Number | The moment | Where it lives today | What tends to slip |
|---|---|---|---|
| 01 | A tenant gives notice | PMS, email and a calendar | The listing can wait until someone remembers it |
| 02 | A renter asks to see the unit | A listing-site inbox | Replies lag, and good applicants move on |
| 03 | An application comes in | A screening vendor’s portal | The decision is made, but the owner hears late |
| 04 | A payment is missed | The ledger, texts and a shared drive | The file is incomplete when it is needed |
| 05 | A property owner asks what is happening | One manager’s inbox | The answer is often rebuilt by hand |
DoorStopper is building the software that carries each of these to its next step, with the right person and a date attached.
Two journeys, step by step.
An ordinary turn. No missed payment, no provider.
The tenant gave notice and paid in full. The turn is its own record from notice to signed lease, and the property owner hears about each decision without anyone rebuilding the story.
IN DEVELOPMENTProduct preview · sample data
A notice to vacate is recorded. The turn opens with a person assigned and a date for each next step.
Your team performs and decides every leasing act. DoorStopper keeps the record and prepares drafts for your approval.
Read both journeys as a list
When a unit turns: TO-4A · Linden Flats 4A
- Aug 30 — Notice — Portfolio Manager: A notice to vacate is recorded. The turn opens with a person assigned and a date for each next step.
- Aug 31 — Owner told — DoorStopper, then Leasing Manager: DoorStopper drafts the update from the record. D. Okafor approves it and sends it to the property owner.
- Sep 5 — Listing — Leasing Manager: DoorStopper prepares a listing draft from the unit record and the last approved listing. One line is held before publishing because it may signal a preference against families with children. D. Okafor rewrites it, approves the draft and publishes it.
- Sep 13 — Tours — Leasing Manager: Inquiries and tours are logged against the turn, so anyone can see how long the unit has spent in each step.
- Sep 14 — Decision — Leasing Manager: One application is reviewed against the posted criteria. The decision is your team’s, and the record names the person who made it.
- Sep 15 — Owner told — DoorStopper, then Leasing Manager: The property owner hears the outcome from the property manager, drafted from the record, approved and sent by D. Okafor.
- Sep 16 — Lease — Portfolio Manager: The signed lease is recorded. The unit is leased before move-out, and move-in is on the schedule.
Your team performs and decides every leasing act. DoorStopper keeps the record and prepares drafts for your approval.
When a payment is missed: EX-2041 · Harbor Row 12B
- Sep 6 — Opened — DoorStopper: The Sep 6 PMS export shows rent not received after the grace period. The exception opens, assigned to M. Alvarez with a due date.
- Sep 7 — Notice — Portfolio Manager: Your team serves the notice to pay. The record asks for proof of service, so the file is complete before anyone needs it.
- Sep 9 — Plan — Portfolio Manager: The tenant is reached on the second attempt, and a payment plan is proposed in writing.
- Sep 10 — Owner told — DoorStopper, then Portfolio Manager: DoorStopper drafts the owner update from the record. M. Alvarez approves it and sends it.
- Sep 15 — Default — Portfolio Manager: The first installment is not received. The plan is recorded in default, and the property owner is told the same day.
- Sep 16 — Handoff — Portfolio Manager, then DoorStopper: Documentation is complete, 6 of 6. M. Alvarez approves the handoff, DoorStopper submits the enrolled case to the provider under written authorization, and the owner hears it is with the provider.
- Sep 18 — With provider — Licensed provider: The licensed provider reviews the file under its own terms. DoorStopper records its decision as issued and does not characterize it.
Your team serves notices and agrees payment plans. DoorStopper does not underwrite coverage or decide claims; where a protection program applies, a licensed provider decides eligibility and every benefit. A case that is not enrolled stays on the record with your team.
Every door, on one schedule.
Every door in one schedule: turns and exceptions side by side, with the person assigned and the next date.
Door schedule
As of Sep 18 · 36 properties · 1,180 doors · turns and exceptions together
| Door | Property | Work | State | Next step | Assigned to | Due |
|---|---|---|---|---|---|---|
| 12B | Harbor Row | Exception | With provider | Provider decision | Licensed provider | — |
| 3A | Alder Court | Exception | Returned payment | Tenant contact | M. Alvarez | Sep 13 · Overdue 5 d |
| 4A | Linden Flats | Turn | Lease in execution | Move-in | D. Okafor | Oct 1 |
| 7C | Linden Flats | Exception | Lease break | Owner update | M. Alvarez | Sep 18 · Due today |
| 14C | Cedar Bend | Exception | Payment plan | Second installment | R. Haddad | Sep 30 |
| 9 | Birch Terrace | — | Current | — | — | — |
| 5D | Willow Crossing | Exception | Resolved | — | — | — |
Product preview, in development. Screens show the software as designed. All data is sample data.
One system for the work around the lease.
Tenant transitions and re-leasing
In development- The problem
- A turn is spread across listing sites, inboxes, a screening vendor and the PMS.
- What the software is designed to hold
- Notice, listing drafts for approval, inquiries and tours, the application decision, the lease, and every owner update, on one turn record.
- Who decides
- Your leasing team performs and decides every leasing act.
Payment exceptions and DoorStopper Protect
In development- The problem
- A missed payment becomes a documentation, notice and owner-communication problem.
- What the software is designed to hold
- One record per exception: notice, payment plan, documentation checklist, provider-ready file and status.
- Who decides
- Your team serves notices and agrees plans. A licensed provider decides any coverage.
Portfolio schedule and queue
In development- The problem
- It is hard to see what is open across the book, who has it and when it is due.
- What the software is designed to hold
- Every door on one schedule; work that needs a person, grouped apart from work waiting on others; overdue steps raised to the manager.
- Who decides
- Your managers assign and re-assign the work.
Owner updates and reporting
In development- The problem
- Property owners ask “what is happening?” and the answer is often rebuilt by hand.
- What the software is designed to hold
- Updates drafted from the record, approved and sent by your team, plus a monthly portfolio report.
- Who decides
- Nothing reaches a property owner without your approval.
AI drafting and checks, with a person approving
In development- The problem
- Listings, owner updates and file summaries take staff time to write, and a careless line can create risk.
- What the software is designed to hold
- Drafts prepared from the record for a named person to edit and approve, with listing language checked before anything is published.
- Who decides
- No draft is published or sent without a person approving it.
What the software is designed to do, and what stays with people.
- 01
DoorStopper prepares
Drafts of listings, owner updates and provider files from the record; checklists that say what is missing; a reminder before a step runs late.
- 02
A person approves
Nothing is published, sent or submitted until the named person on your team approves it. Leasing acts, notices, payment plans and application decisions stay with your team.
- 03
The record verifies
Who did what and when, what changed, and the next step with its date, so the answer to a property owner is already written down.
Drafted lineIdeal for young professionals.
Suggested: Ten minutes from downtown and close to transit.
Edited and approved by D. Okafor, Leasing Manager. Nothing was published before that.
Where DoorStopper is today.
| What | Detail | Status |
|---|---|---|
| Portfolio review | Free. A working session on how turns, missed payments and owner updates move through your team today, with a written summary. | Available now |
| One scoped workflow | Under a written proposal that lists what exists at signing, dates each module in development and names who does each step. Platform plans start at $5,000 to launch plus $450 a month (published at doorstopper.io/pricing). | By written proposal |
| The operating software | The schedule, the turn and exception records, drafting help and owner updates are designed and in development. Screens on this site are product previews with sample data. | In development |
| Financial protection for owners | Only under an approved licensed-provider program, with eligibility and terms confirmed in writing before enrollment. | Provider approval required |
DoorStopper works beside your PMS, which stays the system of record for leases and the ledger.
We started where the work begins: an empty unit.
From April to June 2026, DoorStopper ran a tenant-placement service for individual landlords, with licensed brokerage partners, on leasing tools we built ourselves. We closed that landlord service in June 2026 to build for property-management companies.
Read the company storyKeep your PMS. Start with one workflow.
Integration path, one step at a time
- 01
Documented workflow from exports
Prove the roles, inputs, and handoffs from a PMS export before any integration work.
- 02
Secure file exchange
Scheduled portfolio updates through an approved, controlled exchange.
- 03
Supported connection
An API or PMS connection only after access, fields, security, and end-to-end behavior are verified.
How engagement data is governed
Data terms before data
Fields, access, retention, and deletion are agreed in writing before any import.
Least data by default
An engagement starts with the minimum fields the work needs.
No personal data in analytics
Product events are designed to exclude tenant, applicant, and payment details.
From the first conversation to one workflow running.
- 01
Portfolio review · Free
You bring the portfolio shape, your systems, and how turns, missed payments and owner updates are handled today. We map where work stalls and who carries each handoff, and send you a written summary with the one workflow we would fix first.
- 02
One scoped workflow · By written proposal
The proposal lists what exists at signing, dates each module in development, and states the fee, the milestones and who does what before anything starts. We work from your PMS export, configure the workflow and the update templates in your name, and train your team.
- 03
Ongoing service · Published plans
Work runs to closure, property owners are updated with your approval, and you receive a portfolio report each month. Fees follow the published plans; your proposal confirms which apply.
Prices are published at doorstopper.io/pricing. No provider program is approved for public offer today; when one is, the Protect price includes the provider’s program fee. Data terms are agreed in writing before any import.
Questions
What property managers ask before they start.
Is DoorStopper only for rent risk?
No. DoorStopper is building software for leasing and tenant transitions, payment exceptions, portfolio follow-up and owner communication. Some engagements start with rent risk through DoorStopper Protect, but a turn is its own workflow whether or not a payment was ever missed.
What exists today?
The free portfolio review, and scoped work under a written proposal that lists what exists at signing. The software is in development; the screens on this site are product previews with sample data.
Will AI send anything to our owners, renters or applicants?
No. DoorStopper is designed to prepare drafts; a named person on your team approves every message before it is sent. Nothing is published, sent or submitted on its own.
Our PMS already has workflows. Why add DoorStopper?
Keep them. DoorStopper is designed to work beside the PMS for the work that crosses it: listing channels, inboxes, the screening vendor, the provider and the property owner. The portfolio review shows whether that gap exists in your company before anything is proposed.
Do we have to replace our PMS?
No. Your PMS stays the system of record for leases and the ledger; DoorStopper is designed never to write to it. Work starts from your PMS export. An API or PMS connection is added only after access, fields, security, and end-to-end behavior are verified.
Who decides leasing and application questions?
Your team. DoorStopper prepares drafts for approval; your licensed team performs every leasing act and decides every application.
What is DoorStopper Protect?
The rent-risk part of the software: payment exceptions, documentation, owner-update drafts, provider handoffs and case status. It is in development, and your team keeps the owner relationship and every local decision.
Is DoorStopper the insurer?
No. DoorStopper does not underwrite or decide claims. Where financial protection applies, a licensed provider controls eligibility, terms, and every benefit decision.
How does provider-backed protection become available?
No provider-backed program is approved for public offer today. Protect’s operating workflow can be reviewed now. A financial-protection component is added only under a licensed provider’s written approval for the relevant state and property type, with eligibility, terms, and disclosures confirmed before enrollment.
What does it cost?
Platform plans, DoorStopper Protect and standalone services are priced at doorstopper.io/pricing; when a provider program is approved, the Protect price includes the provider’s program fee. Your proposal, after the free review, confirms which apply to your portfolio.
Who talks to property owners?
You do, in your name. DoorStopper is designed to draft updates from the record; a person on your team approves each one before it is sent.
The same work, at every rental in the country.
The United States has about 49.7 million rental units in 19 million rental properties. Every one of them goes through leases, turns, payments and owner questions. DoorStopper’s plan is to start with one workflow for one property-management company at a time, and to grow from there.
Rental units and properties: U.S. Census Bureau, Rental Housing Finance Survey 2024, reference year 2023.
Read the company thesis
Talk about your portfolio
Start with one conversation.
The first conversation is a free portfolio review: how turns, missed payments and owner updates move through your team today, where days are lost, and which one workflow would be worth fixing first. The written summary is yours whether or not we work together.
Email Kelvin about your portfolio
Your note goes by email to Kelvin Tran, DoorStopper’s founder. The button opens your email app with the request drafted for you to complete. You can also write to kelvin@doorstopper.io directly.