Stop typing
“yes, still available”
Every Marketplace buyer asks the same three things. This answers them in your own words, within minutes, while you get on with your day — and stays quiet about everything else.
Free trial, no card. A confirmation now, then one email when it’s ready — nothing else.
Runs on your Mac Never sees your password 3-minute setup
What it does
Answers the easy ones
It only speaks when it’s certain. Everything else is left for you.
Getting started
Three minutes, no technical steps
No files to edit, no terminal, nothing to configure. If you can install an app, you can do this.
About 3 minutes, start to finish1
Paste your code
It arrives by email the moment you subscribe. One paste and you’re activated.
2
Sign in to Facebook
A normal Facebook window opens. Sign in as you always do — two-factor and all. Your password goes to Facebook, never to us.
3
Press “Find my items”
It lists what you’re selling. Mark anything that’s gone, write your replies once, and turn it on.
Security & privacy
Your account stays yours
This is a tool that runs on your computer, not a service you hand your account to. That difference is the whole design.
We never see your password
You sign in yourself, in a real Facebook window. Your password goes straight to Facebook — never typed into our app, never sent anywhere, never stored. We couldn’t hand it over if someone asked us to.
Your messages never leave your Mac
There’s no cloud. Conversations are read and answered on your own computer. The only thing that ever leaves is an alert to you, and only if you switch alerts on.
Nothing is written by AI
It sends the exact words you typed — nothing invented, nothing paraphrased. It only decides which of your replies fits, and stays quiet when it isn’t sure. You can see every reply before it’s ever used.
Cautious on purpose
It waits between replies, limits how many it sends, ignores your personal conversations entirely, and skips anything it can’t read confidently. Being slow and quiet is the point, not a limitation.
Your subscription is checked offline
The app confirms your subscription on your own machine rather than calling home to let you work. It keeps running if your internet drops, or if we’re having a bad day.
The app isn’t signed with an Apple developer certificate, so macOS asks you to approve it the first time you open it. Here’s exactly what you’ll see.
How it compares
Why not just let Meta AI answer?
Since March 2026 Facebook can auto-reply for you, drawing on what’s in your listing. If your listings already hold every answer a buyer needs, that may well be enough. This is for the answers that don’t belong in a public listing.
Meta AI auto-replies
MPMate
Where the answer comes from
Meta AIYour listing’s own fields — description, price, availability, pickup location.
This appAnything you want to say, including what you’d never publish in a listing: your exact address, the buzzer, which evenings suit you.
Whose words the buyer reads
Meta AIWording drafted by Meta AI. You can edit it when you set the listing up.
This appOnly the sentences you typed. Nothing is generated, ever.
Setting it up
Meta AIEnabled, previewed and edited while you’re creating a listing.
This appWritten once in the app, then used for every listing — including the ones you posted months ago.
What it takes on
Meta AIInitial and repeated questions that the listing already answers.
This appThe three built-in questions on Basic, or as many of your own as you like on Pro. Anything you haven’t written an answer for waits for you rather than being guessed at.
Who else is involved
Meta AIMeta AI generates the reply text on Meta’s systems.
This appRuns on your own Mac. We never see your messages, and no AI writes any of them.
To be fair: Meta’s version is free, built in and needs nothing installed, and for plenty of sellers it will be enough — try it first. This is for the ones who keep typing what a listing can’t hold: the street address, the buzzer code, the evening that actually works. If that isn’t you, save your money.
Pricing
Both plans reply automatically
Basic isn’t a crippled version — it’s the whole product. Pro is for people selling enough that minutes matter.
Basic$5/month |
Pro$10$5/month |
|
|---|---|---|
| Replies automatically, in your words | ✓ | ✓ |
| Unlimited items | ✓ | ✓ |
| Answer the tricky ones inside the app | ✓ | ✓ |
| Notifications on your Mac | ✓ | ✓ |
| See every reply before it sends | ✓ | ✓ |
| How often it checks | Every hour | Every 5 minutes |
| Your own custom replies | — | Unlimited |
| Email alerts while you’re out | — | ✓ |
Both plans start with a 14-day free trial, no card. The first few people here get Pro for $5/month instead of $10 — locked in for as long as you stay subscribed.
Before you sign up
The honest caveat
One thing to know
This automates your own Facebook account. Facebook’s terms don’t allow automation, and accounts can be restricted for it. The app is built to be as careful as it can — only simple questions, spaced-out replies, nothing ambiguous — but the risk is real, and it’s yours. We’d rather tell you now than after you’ve paid.
Mac first — macOS 11 or later, Intel or Apple Silicon. Windows is coming.
FAQ
Questions
Everything people ask first.
How it compares
Isn’t this just Facebook’s own auto-replies?
Facebook added Meta AI auto-replies in March 2026, and they cover the same easy questions using what’s in your listing — so if your listings already hold every answer a buyer needs, start there, it’s free. The difference is where the answer comes from. Meta AI works from listing fields and writes the wording itself. This sends the exact sentences you typed, including things you’d never put in a public listing: your street address, the buzzer number, which evenings suit you. You also write them once for every listing, rather than setting them up on each listing as you create it.
Will buyers realise it’s automated?
Most won’t — the replies are short, in your voice, and arrive quickly, which is how an attentive seller sounds anyway. We won’t pretend it’s undetectable though: if someone asks something odd and gets a straightforward answer about availability, they may guess.
Why not just reply faster myself?
If you can, do. This is for people getting the same three questions ten times a day, or losing sales while they’re at work.
How it behaves
What if I reply myself at the same time?
It steps back. If you’ve spoken last in a conversation it leaves it alone — it will never talk over you or answer something you’ve already handled.
Will it reply in the middle of the night?
It replies whenever it’s running, so yes — if your Mac is awake at 3am, a reply can go out at 3am. There are no quiet hours yet. For now, turning it off overnight is the answer, and quiet hours are near the top of the list to add.
What if someone asks something complicated?
It stays quiet and tells you. Price, condition, delivery, timing, anything with an extra question attached — all of that comes to you. You can answer inside the app or in Messenger as usual.
Will it tell someone an item is available after it’s sold?
Only if you haven’t marked it sold. That’s the one thing it can’t know by itself, so keeping your list current is the single job it needs from you — and it’s two taps per item.
Does it touch my personal conversations?
No. It only looks at conversations attached to a Marketplace listing, and skips everything else before even reading it.
Can I stop it for one particular item?
Yes — mark that item as “on hold” and it won’t answer about it, while carrying on with everything else.
Practical
How do I install it? macOS says it can’t verify the app
The app isn’t signed with an Apple developer certificate, so macOS blocks it the first time and shows this. Four steps, once, and you’ll never see it again.
“MPMate” Not Opened
Apple could not verify “MPMate” is free of malware that may harm your Mac or compromise your privacy.
The wording shifts a little between macOS versions.
1
Drag it to Applications
Open the disk image you downloaded and drag MPMate into your Applications folder, the way you would any other app.
2
Double-click it once, then click Done
macOS won’t open it yet — you’ll get the message above. Click Done. Don’t click Move to Trash.
3
Approve it in System Settings
Go to System Settings › Privacy & Security, scroll to the bottom, and click Open Anyway next to the app’s name. Do this within an hour of step 2, or macOS forgets and you’ll need to repeat it.
4
Enter your Mac password, and open it again
Click Open Anyway once more if you’re asked. That’s the last you’ll see of it — from now on it opens like anything else.
Why does it say that? Apple charges $99 a year for the certificate that removes this warning, and we haven’t bought one yet — at $5 a month it isn’t worth it until there are enough of you to cover it. The warning means Apple hasn’t inspected the app, not that anything is wrong with it. Plenty of small Mac tools are distributed exactly this way, and if that trade-off bothers you, that’s a fair reason to wait.
Does it need my Facebook password?
No. You sign in yourself in a normal Facebook window, including two-factor. The app never sees, stores or transmits your password.
Does my Mac need to stay on?
Yes. It runs on your computer rather than in the cloud, which is what keeps your messages private. If your Mac sleeps it picks up where it left off when you’re back.
Can I use it on two computers?
Yes, one subscription covers your own machines. It’s per person, not per computer — just don’t share your code around.
What happens if Facebook changes and it stops working?
Facebook redesigns things regularly, and when they do we publish a fix that your app picks up on its next check. No reinstall, nothing for you to do. It’s the main thing your subscription pays for.
What happens when my trial ends?
It stops replying and tells you. Nothing is charged unless you choose to subscribe — there’s no card on file during the trial.
Can I cancel?
Any time, and access runs to the end of the period you’ve paid for. Nothing renews after that.
Is my payment handled securely?
Payments go through an established payment provider — we never see or store your card details.
Be one of the first few
Pro for $5/month instead of $10, locked in for as long as you stay. We’ll email you the moment it’s ready, and not before.