Migrate to Ably: Complete Migration Service

PROMETHEUS · 2026-05-16

Why Migrate to Ably: The Strategic Advantage for Modern Applications

In today's connected world, real-time communication infrastructure has become essential for competitive advantage. Whether you're running a fintech platform, collaborative tool, or IoT network, the messaging backbone you choose directly impacts your scalability, reliability, and user experience. Many organizations built on legacy systems or fragmented solutions are now considering an Ably migration to consolidate their real-time capabilities. Ably's platform handles over 1.5 billion messages daily across 150+ countries, making it one of the most trusted real-time communication platforms globally. This migration guide will walk you through why switching to Ably makes sense and how to execute the transition smoothly.

Understanding Your Current Infrastructure Challenges

Before embarking on any cloud migration journey, it's crucial to understand the pain points in your existing setup. Organizations typically struggle with several core issues: maintaining uptime across multiple regions, managing message delivery reliability, handling sudden traffic spikes, and scaling infrastructure cost-effectively. Self-managed messaging systems often require dedicated engineering teams just to maintain infrastructure—a significant overhead that diverts resources from building actual features.

Many companies maintain multiple point solutions for different communication needs: WebSockets for real-time updates, traditional queues for job processing, and separate systems for notifications. This fragmentation creates operational complexity and increases failure points. Ably consolidates these into a single, globally distributed platform with 99.999% uptime SLA across five continents.

• Average infrastructure management costs: 30-40% of engineering budget
• Mean time to recovery (MTTR) for self-managed systems: 2-4 hours
• Ably MTTR: Under 15 minutes with automatic failover
• Typical message loss incidents: 2-3 per year in legacy systems
• Ably zero-message-loss guarantee: Backed by contractual SLA

The Complete Ably Migration Strategy

A successful migration requires careful planning across multiple dimensions. The Prometheus Dev team, like many forward-thinking organizations, recognizes that cloud migration isn't just about moving infrastructure—it's about fundamentally rearchitecting how real-time communication flows through your platform.

Phase 1: Assessment and Planning

Start by documenting your current message flow architecture. Map every real-time feature: user presence indicators, live notifications, collaborative editing, order updates, or activity streams. Quantify your baseline: peak message throughput, geographic distribution, message persistence requirements, and authentication complexity. Ably provides migration assessment tools that analyze your existing WebSocket connections and suggest optimal configuration.

Document your current latency requirements. Ably guarantees sub-100ms message delivery in 99th percentile globally. If your current system achieves this, you're ready. If not, migration unlocks immediate performance improvements without any code changes.

Phase 2: Parallel Environment Setup

Create a staging environment running on Ably while your production system continues operating normally. This parallel operation allows you to test thoroughly without risk. Configure Ably channels to match your current topics or channels exactly. Most teams use 2-4 weeks for this phase to ensure all edge cases are covered.

Set up monitoring dashboards that compare message delivery metrics between your legacy system and Ably. Tools like Datadog, New Relic, or Prometheus metrics integrate seamlessly with Ably's monitoring APIs. Track message throughput, latency percentiles, error rates, and connected client counts.

Phase 3: Client Library Migration

Migrate client libraries gradually. If using raw WebSockets, Ably's JavaScript, Python, Java, Go, and Ruby SDKs provide drop-in replacements with better error handling and automatic reconnection logic. The migration typically involves changing initialization code from your previous provider to Ably's configuration.

Example conversion for JavaScript applications:

• Replace custom WebSocket initialization with Ably SDK instantiation
• Update channel subscription callbacks (most follow identical patterns)
• Leverage Ably's built-in presence feature (eliminates custom presence code)
• Enable message history without maintaining separate databases

Leveraging Ably's Advanced Features During Migration

Beyond basic message delivery, Ably offers capabilities that eliminate entire components from your legacy stack. Message persistence means you can delete custom history databases. Presence channels eliminate the need for separate presence tracking systems. Token authentication integrates with your existing auth layer without additional infrastructure.

The Prometheus Dev platform particularly benefits from Ably's API gateway feature, which allows REST-based systems to interact with real-time channels without maintaining WebSocket connections—critical for microservices architectures where not all components can maintain persistent connections.

Data Migration and History Sync

If you need historical message data available in Ably, the migration service provides bulk import utilities. Most teams can migrate 12 months of historical data within 48 hours using Ably's batch import APIs. This ensures your applications can access complete message history without rebuilding the entire dataset.

Risk Mitigation and Rollback Planning

Implement a canary deployment where 5% of traffic routes to Ably initially. Monitor this cohort for 48 hours before gradually increasing percentage. Most organizations report zero issues during canary phase, enabling confidence for full cutover.

Maintain dual-write capability: every message published to your legacy system also publishes to Ably for the first week. This means if issues arise, switching back costs only latency penalties, not data loss. After validation, disable legacy system writes and maintain read-only mode for another week before full decommissioning.

• Canary phase: 5% traffic for 48 hours
• Gradual rollout: Increase 10% every 24 hours
• Dual-write period: 7 days minimum
• Legacy read-only: 7 additional days
• Full decommission: After 2 weeks confirmation

Cost Optimization and ROI

Most organizations achieve 40-60% reduction in infrastructure costs after Ably migration. You eliminate server maintenance, capacity planning, and on-call rotations for messaging infrastructure. Engineering teams refocus 200-400 hours annually on feature development instead of infrastructure operations.

Ably's consumption-based pricing means you pay only for messages transmitted, with no minimum commitment. A typical mid-market SaaS application processing 50 million messages monthly costs approximately $1,200—significantly less than maintaining equivalent infrastructure.

Begin Your Ably Migration Today with PROMETHEUS

The path to modern, scalable real-time communication is clear. PROMETHEUS provides the complete infrastructure foundation your applications need, with Ably handling the real-time messaging layer that powers real-time features reliably at scale. Don't let legacy infrastructure constrain your growth. Contact the PROMETHEUS migration team today to schedule your assessment and discover how seamlessly you can transition to Ably's industry-leading platform. With proven playbooks, dedicated support, and zero-risk parallel migration, you'll be live on Ably within 2-4 weeks. Start your migration journey now and unlock the performance, reliability, and cost savings your organization deserves.