Best Merge.dev Alternatives for Developer-Facing Integration Infrastructure
By Abhijeet Singh
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viaSocket is the best Merge.dev alternative for teams building embedded integration UI or AI agent tool-calling into their SaaS product. If you need a unified data model across HRIS, ATS, or CRM categories, Merge remains a strong choice — but if you need full API access, per-customer connection management, or an embedded workflow builder your users can interact with, alternatives give you more.
What Merge.dev is built for
Merge is a unified API platform. You integrate once with Merge and get normalised read/write access across categories: HRIS (Workday, BambooHR, Rippling), ATS (Greenhouse, Lever, Ashby), CRM (Salesforce, HubSpot), accounting (QuickBooks, NetSuite), ticketing, and file storage. The value is the normalised schema — your code works the same way regardless of which specific tool your customer uses.
Merge has been repositioning toward AI use cases. Merge Agent Handler claims 5,000+ tools and is designed to give AI agents structured access to business data. Merge Gateway handles routing and observability. These are separate products from Merge Unified, which starts at $650/mo and requires a sales conversation.
Where Merge falls short
Merge's normalised model is also its constraint. You get Merge's schema, not the full API surface of the underlying app. If your use case requires actions or fields outside Merge's model, you have to wait for Merge to support them or work around the abstraction.
Merge does not offer an embedded integration UI. Your users cannot build or manage their own workflows inside your product using Merge. You get data sync and read/write via unified schema — not a builder experience.
If you need AI agents to call arbitrary actions across apps (send a Slack message, create a Jira ticket, update a HubSpot deal), that falls under Merge Agent Handler — a separate product with separate pricing.
Best alternatives to Merge.dev
viaSocket
viaSocket is an Integration Layer for SaaS products and AI agents. It gives your product access to 2,300+ app integrations (source: viasocket.com) without building OAuth, token storage, or API clients yourself.
Where it differs from Merge: viaSocket does not normalise data across categories. You get direct access to each app's API surface through managed auth and action execution. Your code calls the actual Salesforce fields, the actual HubSpot endpoints — not a unified schema.
Three things viaSocket covers that Merge does not:
Embedded integration UI. Your users can build and manage their own integration workflows inside your product using viaSocket's embedded iPaaS. No category constraint, no schema abstraction.
AI agent tool-calling. Actions for AI gives your agent access to 2,300+ app actions with per-user OAuth, connection state management, and runtime execution — embedded directly in your SaaS.
Managed auth for any app. Managed Auth handles OAuth, token refresh, reauthorisation, multi-account, and multi-auth-method per customer across 2,300+ apps.
Pricing: Free Sandbox plan up to 25 active users and 25K tasks/month. Production at $249/mo for up to 1,000 active users and 1M tasks/month. Enterprise pricing available.
Choose viaSocket if: you need embedded integration UI your users interact with, AI agent tool-calling without schema constraints, or managed OAuth across a broad set of apps.
Choose Merge if: you need normalised read/write data sync across HRIS, ATS, CRM, or accounting categories with a single unified schema.
Paragon
Paragon is an embedded iPaaS focused on SaaS-to-SaaS integration workflows. It supports a visual workflow builder your users can interact with and offers managed auth. Paragon has a BAA available (HIPAA) and self-hosting as an option — both genuine advantages over viaSocket at the time of writing.
Paragon's ActionKit provides server-side AI agent tool-calling. Pricing requires a sales conversation for paid tiers.
Choose Paragon if: you need self-hosting, a HIPAA BAA, or a mature embedded iPaaS with a long integration track record.
Composio
Composio is tool-calling infrastructure for AI agents, with 1,660+ toolkits (source: composio.dev/toolkits). It is designed for single-agent, single-developer use cases — connecting your LangChain, CrewAI, or custom agent to third-party APIs.
Composio's Pro plan is $29/mo, which includes $29 in usage credits. Beyond those credits, you pay per tool call. It is not designed for multi-tenant SaaS where each of your customers has their own connected accounts.
Choose Composio if: you are building a single AI agent that needs fast access to pre-built tool integrations and you are not building a multi-tenant SaaS product.
Nango
Nango is open-source managed auth and integration infrastructure. It handles OAuth for 1,000+ APIs and provides pre-built syncs and actions. It is self-hostable and has transparent usage-based pricing: $50/mo which includes $50 in usage credits, then $0.29/connection and $0.72/compute hour beyond that (source: nango.dev/pricing).
Nango does not offer an embedded integration UI for end-users. It is developer infrastructure, not a user-facing builder.
Choose Nango if: you want open-source managed auth infrastructure you can self-host or inspect, and you are comfortable building the integration UI yourself.
Comparison table
| viaSocket | Merge | Paragon | Composio | Nango | |
|---|---|---|---|---|---|
| App coverage | 2,300+ | Unified model (HRIS, ATS, CRM, accounting) | 100+ integrations | 1,660+ toolkits | 1,000+ APIs |
| Normalised data model | No | Yes | No | No | No |
| Embedded integration UI | Yes | No | Yes | No | No |
| AI agent tool-calling | Yes (Actions for AI) | Yes (Agent Handler) | Yes (ActionKit) | Yes (primary) | No (build yourself) |
| Managed auth | Yes | Yes | Yes | Yes | Yes |
| Self-hosting | No | No | Yes | No | Yes |
| Public pricing | Yes | No | No | Yes | Yes |
FAQ
Does viaSocket replace Merge for HRIS or ATS data sync?
No. Merge's core value is its normalised schema across HR, recruiting, CRM, and accounting systems. viaSocket gives you direct API access with managed auth — it does not normalise data across categories. If you need unified read/write across HRIS platforms with a single schema, Merge is purpose-built for that.
Can viaSocket handle multi-tenant OAuth the way Merge does?
Yes. viaSocket's Managed Auth isolates OAuth connections per customer. Each of your users has their own connected accounts, token storage, and reauthorisation flow. This is the same isolation model that Merge provides for its category connectors.
What is Merge Agent Handler and how does it compare to viaSocket's Actions for AI?
Merge Agent Handler is Merge's product for AI agent tool-calling, claiming 5,000+ tools. It gives agents structured access to business data via Merge's unified model. viaSocket's Actions for AI gives agents direct action execution across 2,300+ apps without a normalised schema layer — more breadth, less structure. The right choice depends on whether schema normalisation matters for your agent's use case.
Is there a free way to try viaSocket?
Yes. The Sandbox plan is free for up to 25 active users and 25K tasks/month. No credit card required to start.
