Sintra Mobile App: What Works on iPhone and Android, What Doesn't

Sintra's app runs on iPhone, iPad and Android phones, costs nothing to download and does nothing without a paid Sintra subscription. It gives you the same AI employees and the same Brain AI as the computer version, plus voice conversations that exist only in the app and are still in beta ^[1]. It also leaves out several web features, so it works as a remote control rather than a full replacement. Where you pay matters more than where you chat. In the App Store, Sintra X Monthly is listed at $48.49 a month. A plan bought through Apple or Google is billed, canceled and refunded by that store, outside Sintra's 14-day money-back guarantee. Chat on the phone. Buy on the website.

Getting the app running

The iOS version launched in November 2024 for iPhone and iPad and needs iOS 16.4 or later. The download is about 167.8 MB. On Android, the Google Play listing shows more than 50,000 downloads. Both apps are published by PlayOS, Inc., the company behind Sintra, and both list in-app purchases. The App Store listing says plainly that Sintra requires a subscription, which matches the web product: you cannot log in to do real work without an active plan. Because the app uses the same AI employees and Brain AI, what you taught Sintra on the web carries over.

Know how the account is shaped before you start. Each business can have its own workspace with its own Brain AI, its own integrations and its own credit balance. Team members get their own logins without a subscription of their own, and the owner pays for the plan. Gmail, Outlook and Notion connections stay personal to each user, while shared integrations are added by the owner. The phone changes none of this. It is another window onto the same workspace, with a few extras and a few gaps.

What the app adds, and what still needs a browser

The mobile extras

The headline extra is voice conversations, which both store listings describe as a beta available only in the app. The mobile chat also has a voice record button that transcribes what you say into a message ^[2], so you can dictate a request to Penn or Vizzy between meetings. A Train Helpers button asks you 10 questions a day about your business, and your answers feed Brain AI, which every helper reads from.

The app also pushes. Sintra says it sends notifications about important events, completed helper tasks and urgent requests. It suggests daily tasks built from what Brain AI knows about your business. You swipe through them and approve each with one tap. That is the habit the app is designed around: a few minutes a day reviewing what the helpers propose, instead of opening a laptop. For a solo owner who wears too many hats, this is the part that earns the download.

The gaps

Sintra's launch post for iOS said every web feature was also on mobile. The newer help center says otherwise, and it wins. Parallel chats, where several helpers work in separate threads at once, are not on mobile yet. Neither are the per-helper conversation settings: vibe, message length, language level, the Search Google and Writing Style toggles, and custom instructions all live in the browser. Brain AI folders, auto-organization and the contradiction check are missing from the app as well. The feature request wishlist needs a browser login at app.sintra.ai. Plan your setup work for the computer.

There is also no live sync between devices. A chat you start in the browser does not appear on the phone while the app is open. You close the app, reopen it, and the chat is there. Nothing is lost, but the gap confuses people who think a conversation has vanished. If you switch devices during the day, reopening the app becomes a reflex.

Approving posts, replies and events from your phone

Approvals are where the app is most useful and where it differs most from the web. Soshie drafts posts weekly from the themes you tick in the content calendar, and every Sunday you get an inbox notice asking you to approve them. On the web, an approval card handles this. On iOS and Android there is no approval card yet: you open Soshie's chat and ask her to approve the post, which moves it from waiting for approval to scheduled. Until you do, nothing goes out. Our Soshie guide covers the networks and format limits behind those drafts.

The same rule holds for the other helpers. Cassie's inbox and Facebook comment replies wait as drafts until you approve them, and an email Vizzy writes in chat goes out only when you press Send. When you ask Vizzy for a meeting, a confirmation window appears before the event is created; the Vizzy guide explains her calendar rules. The exception is a recurring scheduled task you set up yourself. It runs on its timetable with no approval step, phone or not, and it spends credits each time. Review your scheduled tasks before you rely on the app as a safety net.

Buying Sintra X through Apple or Google

You can subscribe inside the app, and the store sets the price. On Android, check the price in the Google Play listing before you tap Subscribe. In the App Store, one Sintra X Yearly entry carries a 7-day trial; that is a store offer, not something the website sells. Discounts and promo codes apply only to website subscriptions, never to store purchases. These are the in-app purchases the US App Store listing shows for Sintra:

On the website, Sintra X costs $48.50 a month billed monthly, $70.80 every three months billed quarterly, or $15.60 a month billed yearly, which is $187.20 a year by our arithmetic. Every option includes 250 credits a month, and the credits reset monthly even on longer terms. Sintra does not guarantee the renewal price on any channel: its Terms charge renewals at the then-current rate, and our pricing guide covers the web plans in full.

Credits work differently by channel. The app sells workspace credit tiers of 150, 300, 500, 700 and 900 a month, with Monthly, Tri-Monthly and Annual periods per workspace. Sintra says 900 is the ceiling because of App Store and Google Play policies ^[3]. On the web, credit upgrades run from 300 to 5,000 a month, and Sintra's Summer Edition added 7,000 and 10,000 tiers. A team that expects heavy video work, at about 40 credits per 15 seconds, may outgrow what the store can sell.

Canceling and refunds when the store bills you

A plan bought in the app belongs to Apple or Google. You cancel it in the store's subscription settings, not inside the Sintra app, and deleting the app cancels nothing. Access and remaining credits continue until the paid period ends, and you can resubscribe later if you want the helpers back. On the website, only the workspace owner can cancel billing in a shared workspace; a store plan is canceled from the Apple or Google account that bought it. Canceling stops future renewals, not charges already made.

Refunds follow the same split. Sintra's 14-day money-back guarantee covers web checkout purchases only; App Store and Google Play purchases follow the stores' own refund policies ^[4]. Sintra cannot refund an App Store subscription. Google Play purchases are refunded and canceled through your Google Play account. On the web, the guarantee applies to the first purchase only, and you must ask support for the refund explicitly. Sintra treats credits as non-refundable; for anything bought in the app, credit tiers included, Apple or Google decide refunds under their own policies. If you might want your money back in the first two weeks, the website is the safer place to subscribe.

What the store listings say about data and complaints

The App Store privacy label says contact info, identifiers and usage data may be used to track you across apps and websites owned by other companies. The Google Play data safety section says data is encrypted in transit, that you can request deletion, and that the app may share data types such as photos, videos and audio with third parties. The iOS developer has not indicated which accessibility features the app supports. Read the labels before you connect a work inbox. Sintra itself advises removing personal details before you upload files.

Complaints on Google Play cluster around credits. One reviewer says the month's credits were gone on the first day. Another says a video cost 60 credits with no preview, and a corrected version cost 60 more. Sintra replied that video generation is still in early release and that it refunds credits spent on unsatisfactory results if you write to help@sintra.ai. Other reviewers say helpers sometimes fail to read PDFs from Brain AI and that video posts have failed without a notification. Check the usage log after anything heavy.

Phone for approvals, browser for setup

The Sintra app is worth installing if you already pay for Sintra X. It turns approvals, quick questions and daily task suggestions into something you clear in minutes, and voice lets you ask without typing. It is not a full copy of the web app: settings, parallel chats and Brain AI organization still need a browser, and syncing needs a reopen. The bigger decision is where to subscribe. Buying in the app trades Sintra's own guarantee and the larger credit tiers for store billing. Buying on the website keeps both. Install the app either way.