A PubNub Alternative Built on Open Standards
CloudSignal delivers real-time messaging on MQTT - an open ISO standard - with flat-rate pricing, broker-level security, and native AI transport. No proprietary SDKs required.
Feature Comparison
An honest, side-by-side look at what each platform offers.
Why Developers Choose CloudSignal
Four areas where CloudSignal meaningfully differs from PubNub.
Open Protocol, No Lock-in
CloudSignal is built on MQTT - an ISO/IEC standard used across industries from IoT to finance. Any MQTT-compatible client works out of the box. Migrate away at any time without rewriting your application.
Security at the Broker Level
Access control rules are enforced inside the broker itself, not as middleware in your application code. Topics are identity-bound, so a compromised client cannot publish to channels it was never authorized for.
Predictable Pricing
PubNub bills per transaction, per monthly active user, and per optional add-on. CloudSignal charges a flat monthly rate. Your bill does not spike when a feature goes viral.
AI-Native Transport
The CloudSignal AI Transport integrates directly with the Vercel AI SDK, streaming AI responses over MQTT in real time. No polling, no SSE workarounds - persistent bidirectional channels for every model interaction.
Making the Right Choice
Both platforms are mature products. The right choice depends on your team's priorities.
Choose CloudSignal if...
- You need a standards-based protocol that works with existing MQTT clients and libraries
- Cost predictability matters - fixed monthly plans instead of per-message billing
- Security requirements demand ACL enforcement at the transport layer, not in application logic
- You are building AI-powered chat, assistants, or streaming interfaces with the Vercel AI SDK
- You want offline-first messaging with guaranteed delivery via MQTT QoS semantics
- You need the option to self-host or move to a different provider without a full rewrite
Choose PubNub if...
- You need a large set of enterprise-specific vertical solutions (healthcare, fintech, gaming) with pre-built compliance features
- Your team is already deeply integrated with PubNub SDKs and the migration cost outweighs the benefits
- You require serverless Functions (PubNub Functions) to run edge logic inside the messaging layer
- You want the reassurance of a larger, more established vendor with a longer enterprise track record
Transparent Pricing at Every Scale
CloudSignal's plans are straightforward: a free tier with 50,000 messages per month, a $29/month Pro plan, and a $79/month Scale plan. No per-MAU charges, no per-transaction fees, no surprise bills at the end of the month.
Ready to Switch?
Start on the free tier - no credit card required. Your first 50,000 messages are on us.
Questions about migrating from PubNub?