API Integration vs iPaaS vs Enterprise Automation Platforms
"We need to connect our systems" has at least three very different answers, at three very different price points, with three very different failure modes. Custom API integration, self-service iPaaS, and enterprise automation platforms all move data — but they're built for different problems, and buying the wrong tier costs more than money.
The Three Tiers
Custom API integration
A developer writes code against each system's API. Maximum flexibility, zero platform fees — and total ownership of every breaking change, retry bug, and 2 a.m. failure forever. Rational for one unusual, stable connection; irrational as a strategy. The five-year cost is dominated by maintenance nobody budgeted.
Self-service iPaaS — Zapier, Make
Zapier is the fastest way to wire app-to-app tasks: form fills to CRM leads, notifications to Slack. Thousands of apps, minutes to build, priced per task. Make adds visual multi-step scenarios with branching and iteration at aggressive pricing.
Both are superb at tasks — and strained by processes. High-volume order flows, bidirectional financial sync, guaranteed delivery, and deep ERP work (QuickBooks Desktop, Sage 100) are outside their design center. Costs also scale per-task, so success gets expensive.
Developer iPaaS — Celigo, Boomi, MuleSoft
Celigo is strong in the NetSuite ecosystem with genuinely good pre-built "integration apps." Boomi is a mature, broad enterprise iPaaS with master-data tools. MuleSoft is the heavyweight: an API-management-plus-integration platform built for large enterprises composing hundreds of services.
The trade: all three assume integration specialists on staff or an SI partner on retainer. Licensing and implementation land in enterprise territory, and business users won't touch the tooling. You're buying a capable toolkit — and the obligation to operate it.
Enterprise automation platforms — InterWeave
The fourth model skips the toolkit and delivers the outcome: pre-built, maintained business processes — quote-to-cash, payment reconciliation, subscription billing — running on 200+ connectors across CRM, ERP, and payments, configured rather than coded, with monitoring, audit trails, and human-in-the-loop AI on top. Aimed squarely at mid-market companies that need enterprise-grade financial integration without an integration engineering team.
How to Choose
- Zapier / Make — convenience automations where a missed task is an annoyance, not a financial event. Keep them for notifications and lead capture even after you outgrow them elsewhere.
- Celigo / Boomi / MuleSoft — you have (or will fund) an integration team, complex multi-domain architecture, and API management needs beyond app-to-app sync.
- InterWeave — your integrations carry money: orders, invoices, payments, subscriptions. You want the process delivered and operated, not a toolkit to build it with.
- Custom code — one unusual connection no platform covers, owned by a team that will still exist in five years.
"Don't ask which platform is best. Ask what breaks — and what it costs — when a sync fails at your volume. The answer picks the tier for you."
The Question Behind the Question
Every option above ultimately divides into two purchases. With a toolkit — custom code, Zapier, Make, Boomi, MuleSoft — you buy capability and supply the expertise, the process design, and the ongoing operation yourself. With an outcome platform, you buy the working process: the connectors stay maintained when APIs change, the flows come with exception handling designed in, and the vendor's team is accountable for it running.
Mid-market companies are chronically sold toolkits sized for enterprises or task apps sized for startups. The honest fit is usually the outcome model — which is the gap InterWeave was built to fill.
List your integrations and label each one: convenience, or money-moving? Convenience can live on task tools. Anything that moves money deserves a platform accountable for it.