Aviationstack ◆
Aviationstack is a scalable REST API for real-time flight tracking, historical flight data, airport info, and global aviation data.

Engagespot (Developer Tools): Engagespot is developer-first notification infrastructure with a free tier and scalable pricing. Pricing: Free forever. (data verified August 2026)
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Engagespot is a notification infrastructure platform that lets developers integrate multi-channel notifications—email, SMS, push, Slack, Discord, webhooks, and more—into their apps via a single API. It handles message brokers, queues, rate limiting, and retry logic, so you don't have to build and maintain that plumbing yourself.
Building a reliable notification system from scratch is time-consuming and error-prone. Engagespot removes the heavy lifting: you add one API and get a unified interface for all channels, plus templates, preference management, and workflow automation. That means faster feature shipping and fewer engineering hours spent on infrastructure.
Engagespot is built for developers at startups and growing companies that need to send notifications to users quickly—think SaaS apps, marketplaces, fintech, and any product with user activity alerts, security alerts, or promotional campaigns. It's ideal if you want to avoid managing complex messaging infrastructure. It's not for low-code or no-code teams looking for a drag-and-drop notification builder.
Use Engagespot to power in-app inboxes, email receipts, push alerts for mobile apps, Slack notifications for team events, or SMS for critical security alerts. Its preference manager lets users choose how they want to be notified, and workflows enable multi-step notification sequences.
Editorial score from our review methodology — not user ratings.
Engagespot pricing: Free forever. Billing model: Free.
$0. Includes 10,000 event triggers per month, unlimited channels, unlimited workflows, 2-way notifications, US/EU region, multi-tenancy, and email support.
$250/month. Includes 250,000 event triggers per month (with $1.5 per 1K additional triggers, capped). Everything in Free, plus removal of Engagespot branding, multi-lingual templates & translations, priority email and chat support, and unlimited environments.
Starting at $2,500/month. Custom volume-based pricing. Everything in Growth, plus custom SLA, 24/7 priority support, dedicated solutions architect, data warehouse & observability integrations, custom log retention, SSO SAML, SOC 2, HIPAA compliance, and private cloud or on-prem deployment.
All plans start with a free tier – no credit card required for the free plan.
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