Whisperr vs OneSignal
OneSignal is a messaging platform: it delivers the push, email, SMS and in-app messages you set up, with Journeys to automate them. Whisperr decides which users need a retention message, writes it for each of them, and can send it through your own OneSignal account. They are not either-or: you can keep OneSignal for delivery and let Whisperr decide and write the retention messages.
At a glance
| Whisperr | OneSignal | |
|---|---|---|
| What it is | A retention engine that decides, writes and sends messages per user | A messaging platform for push, email, SMS and in-app messages |
| Who decides who gets a message | Whisperr, per user, from product and subscription events | You, with segments, Journeys and one-off sends |
| Who writes the message | Whisperr writes each one for that user, in your app’s voice and their language | You, with OneSignal AI to draft copy |
| Channels | Push and email | Mobile push, web push, email, SMS and in-app |
| Delivery | Through your own providers, and OneSignal can be one of them | OneSignal delivers; email can also go through SendGrid, Mailgun or Mandrill |
| Subscription data | RevenueCat, Superwall, Adapty | RevenueCat writes subscription tags to OneSignal |
| Pricing | Free up to 1,000 users; paid from $49 a month | Free plan; Growth from $19 a month; Professional and Enterprise custom |
What OneSignal does well
OneSignal makes sending easy and cheap to start. Its free plan covers mobile push, and Growth starts at $19 a month. It covers mobile push, web push, email, SMS and in-app messages, with SDKs for nearly every mobile framework. Journeys automate multichannel flows, Intelligent Delivery picks a send time per user (it isn’t on the Free plan), and OneSignal AI drafts copy and segments. RevenueCat can write subscription status to OneSignal as tags, so you can target users by plan or trial state.
How Whisperr works differently
OneSignal delivers what you tell it to send. Whisperr decides what to send, to whom, and whether to send anything at all. It reads each user’s product events and subscription events from RevenueCat, Superwall or Adapty, picks the users a message would help, and writes one message for each of them. Then it sends that message through your own push account (OneSignal, Firebase Cloud Messaging, Apple Push or Expo) or by email through Postmark, Resend or SendGrid.
A 10% holdout group gets no messages, so once each group has 200 users you see how many users the messages kept, not just how many opened them.
Which should you choose?
Use OneSignal alone if you want a low-cost way to send push and email you design yourself, including promotions, product news and transactional messages, and you’re happy to build and maintain the journeys.
Add Whisperr if you want retention handled per user: drifting users caught early, trial-ending, failed-payment and renewal-off moments covered, messages written for each person, and proof against a holdout. Whisperr can send through the OneSignal account you already have.
Pricing
OneSignal’s pricing page lists Free ($0), Growth (from $19 a month, priced by usage) and custom Professional and Enterprise plans. Whisperr is free up to 1,000 users and its paid plans start at $49 a month for 5,000 users, each with a 30-day free trial. Full pricing.
FAQ
Does Whisperr replace OneSignal?
Not necessarily. Whisperr can use your OneSignal account as its push provider, so OneSignal keeps delivering notifications while Whisperr decides who gets a retention message and writes it. Firebase Cloud Messaging, Apple Push and Expo also work.
How much does OneSignal cost compared with Whisperr?
OneSignal has a free plan, a Growth plan that starts at $19 a month, and custom-priced Professional and Enterprise plans. Whisperr is free up to 1,000 users, paid plans start at $49 a month, and each paid plan starts with a 30-day free trial. If you use both, you pay for both.
Does OneSignal write retention messages for me?
OneSignal AI is an assistant that drafts message copy and segments for you to review, and Journeys automate the flows you design. Whisperr writes each retention message for one user from their own activity, and decides whether that user should get a message at all.
Can OneSignal send at the best time for each user?
Yes. OneSignal's Intelligent Delivery picks a send time per user, and it isn't on the Free plan. Whisperr holds messages during quiet hours in each user's local time and applies daily and weekly caps.
Sources
Facts about other products come from their own websites and docs, checked on . Prices and plans change, so confirm them with the vendor.
Let Whisperr run this for you.
Whisperr watches how people use your app, spots the ones about to leave and brings them back with the right message at the right moment. After you sign up, one prompt in your coding agent sets it up.
You approve until you trust it. Then it runs itself.