OneSignal - Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
Litmus - litmus tests and tracks your email campaigns, so you can always put your best design forward.
Truepush - Unleash limitless possibilities with Truepush and save up to $600 monthly. Free up to 10K Subscribers on all features.
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
PushCrew - Push Notifications for Websites
250ok - 250ok offers a SaaS-based platform to monitor and measure the deliverability of email networks.