Engagement you own.Why we built Retainza, your channels, your credentials.

Every serious app needs to reach its users, a trial-ending nudge, a shipped-order push, a re-engagement email. But the tools to do it well are closed, expensive, and hold your data and deliverability hostage.

Retainza flips that. It's a developer-first platform for the five things that actually move retention: email, push, in-app messages, deep-link navigation, and conditional automated sends. You bring your own FCM and SMTP, so we never own your delivery cost or your inbox reputation.

It's multi-tenant from day one, with the Project as the isolation boundary. Secrets are encrypted at rest with envelope encryption, a fresh data key per secret, wrapped by a master key that never leaves the process. And clean Store and Channel adapter seams mean you can move from in-memory to Postgres, or swap any channel, without a rewrite.

Start free and move to a fixed monthly plan as volume grows, your data and your credentials stay yours throughout.

What is Retainza

Push, in-app and email for your app — without the enterprise bill.

Retainza is a customer engagement and retention platform for apps: push notifications, email, in-app messages and deep-link navigation, driven by segments, campaigns and event tracking, with an AI assistant (Ask AI) that drafts campaigns, segments and templates for review. It is developer-first: messages go out through the customer's own Firebase (FCM) project and SMTP provider, so the customer keeps control of deliverability and sending cost. Pricing: a free plan (1,000 MTU), then Starter $50/mo (10,000 MTU), Growth $70/mo (25,000 MTU), Scale $100/mo (50,000 MTU); limits are hard caps with no overage billing. It suits startups and growth teams that want push, in-app and lifecycle messaging without enterprise-suite pricing.

Channels
Push to Android and iOS through your own Firebase project, email through any SMTP provider, in-app messages in five layouts, and deep links into any screen.
Ask AI
Describe a campaign, segment or template and Ask AI drafts it. Nothing reaches users until you confirm.
Pricing
Free for 1,000 MTU. Paid plans $50 / $70 / $100 per month, hard caps and no overage billing. See every limit.
Developers
SDKs for React Native / Expo and iOS today, with Android, Flutter and Node built and on their way to public registries. Guides, the HTTP API and an MCP server for AI coding tools are in the developer docs.

Stop burning budget on engagement.Same tools. Less cost. Less complexity.

Book a demo, or start engaging customers today.

Start engaging customers

Not ready to sign up? Get a free retention plan.

Tell us your app and we'll send which users to reach, on which channel, and when, within one business day.

We'll use your email to reply and follow up. Privacy