---
title: NoLag vs Ably
description: "NoLag vs Ably: both are realtime pub/sub platforms with presence. NoLag adds a coordination layer for AI agents and ready-made high-level SDKs so you ship features faster."
---

# NoLag vs Ably

Ably is a mature realtime platform known for pub/sub, presence, message history, and strong delivery guarantees. NoLag is realtime messaging infrastructure with the same pub/sub foundation, plus two things Ably does not focus on: blueprint SDKs for common app patterns, and a coordination layer built for AI agents.

Short version: if you need a battle-tested realtime transport with rich delivery semantics, Ably is a strong choice. If you want to move faster with higher-level SDKs, or you are building agentic features, NoLag is built for that.

## At a glance

| | NoLag | Ably |
| --- | --- | --- |
| Core model | Realtime pub/sub over WebSocket | Realtime pub/sub over WebSocket |
| High-level SDKs | Blueprints for chat, notify, feed, dashboards, tracking, sync, and more | Pub/sub, presence, history primitives |
| AI-agent coordination | Built in: dispatch, share state, observe, approve | Not a focus |
| Delivery | Presence, QoS levels | Presence, history, delivery guarantees |
| SDKs | JavaScript/TypeScript, Go, Python | Client and server libraries across many languages |

## Where NoLag is different

- **Blueprint SDKs.** A domain-specific API for chat, notifications, dashboards, tracking, and more, so you skip the plumbing.
- **A coordination layer for AI agents.** Dispatch, share state, observe decisions, and gate actions with human approval, framework-agnostic and on the same infrastructure as your app features.
- **Agents and humans on one platform.** No separate stack for agentic features.

## Where Ably is a strong fit

- A mature, widely trusted realtime platform.
- Rich delivery semantics and message history out of the box.
- Broad official SDK coverage.

## When to choose NoLag

- You are building AI-agent features and want coordination primitives, not just transport.
- You want higher-level SDKs to ship common realtime patterns quickly.
- You want one platform for both human-facing and agent-facing realtime.

## Try it

Follow the [5-minute quick start](/docs/getting-started), then look at the [high-level SDKs](/docs/high-level-sdks) and the [AI agents](/docs/agents) guide.