Best API Integration Platforms in 2026
Updated
In short: Knit is ranked #1 of 34 as of 4 October 2026, ahead of Apache NiFi and Windmill. The best-ranked option with a free plan is Apache NiFi. The lowest first paid tier on this page is Sheety at $9.99/mo.
Connecting services through APIs often involves building repeatable workflows and deciding how those integrations will run. Compare custom connectors, reusable workflows, webhook triggers, and workflow-builder capabilities, as well as self-hosted deployment. Free-plan availability and included executions can be considered alongside paid-from pricing when assessing usage and cost. Knit, Apache NiFi, and Windmill are among the entries. Think about whether your integration work needs reusable processes, event-triggered workflows, or a self-hosted setup, then weigh those needs against the listed features.
34 API integration platforms ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
8 of the 25 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | KnitWeb · Android · iPhone · API | Three bars | — | 3 of 6 | Free | 6.6 | |
| 2 | Apache NiFiWeb · Windows · Mac · Linux · Self-hosted · API | Three bars | — | 4 of 6 | Free | 6.5 | |
| 3 | WindmillWeb · Windows · Linux · Self-hosted · API | Three bars | — | 3 of 6 | $120/mo | 6.5 | |
| 4 | CeligoWeb | Two bars | — | 1 of 6 | Free | 6.4 | |
| 5 | NangoWeb · Self-hosted · API | Two bars | — | 1 of 6 | $50/mo | 6.4 | |
| 6 | Workato Agent StudioWeb · API | Two bars | — | 1 of 6 | $75/mo | 6.4 | |
| 7 | Google Cloud Application IntegrationWeb · API | Two bars | — | 1 of 6 | Free | 6.3 | |
| 8 | SheetyWeb | Two bars | — | 1 of 6 | $9.99/mo | 6.2 | |
| 9 | Apache CamelWindows · Mac · Linux | One bar | — | — | 3 of 6 | — | 5.4 |
| 10 | Jitterbit HarmonyWeb · Windows · Linux | Two bars | — | — | 3 of 6 | — | 5.4 |
| 11 | Oracle IntegrationWeb · API | One bar | — | — | 1 of 6 | — | 5.4 |
| 12 | n8nSelf-hosted | One bar | — | — | 0 of 6 | €20/mo | 5.3 |
| 13 | SnapLogicWeb | One bar | — | — | 1 of 6 | — | 5.3 |
| 14 | ServiceNow Integration HubWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 15 | FedifyNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 16 | SuperfeedrWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 17 | TransportAPIWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 18 | WrapAPIWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 19 | WSO2 IntegratorWeb · Windows · Mac · Linux | Two bars | — | — | 4 of 6 | — | 5.1 |
| 20 | BoomiWeb · Self-hosted · API | One bar | — | — | 1 of 6 | $99/mo | 5.0 |
| 21 | PipedreamWeb | No signal | — | — | 1 of 6 | — | 5.0 |
| 22 | Tray.aiWeb · API | One bar | — | — | 1 of 6 | — | 5.0 |
| 23 | CyclrWeb | One bar | — | — | 1 of 6 | — | 4.9 |
| 24 | elastic.ioWeb | One bar | — | — | 1 of 6 | — | 4.9 |
| 25 | FrendsWeb | One bar | — | — | 1 of 6 | — | 4.9 |
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which API integration platform is ranked first on Freedom251?
Knit is ranked #1 of 34 with a score of 6.6. Apache NiFi is second and Windmill third.
How many of these have a free plan?
8 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Sheety has the lowest first paid tier we found: $9.99/mo.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation. Paid placements never change a rank.