Best Form API Software in 2026
Updated
In short: Paperform is ranked #1 of 25 as of 3 October 2026, ahead of SurveyJS and HeadlessForms. The best-ranked option with a free plan is SurveyJS. The lowest first paid tier on this page is Formcarry at $0.42/mo.
For forms that need to feed data into a product or process, the ranked options span form features and integration details. Endatix leads, followed by Basin, Paperform, HeadlessForms and Formcarry; Feathery, OpnForm and Form.io are also among the first entries. Compare conditional logic, file uploads and electronic signatures with webhooks to see how submissions can meet your workflow needs. Deployment model and monthly submissions can help frame implementation and expected use, while free-plan availability and paid-from pricing give cost context. Consider what respondents need to provide and what your system should do with each submission, then weigh the listed capabilities accordingly.
25 form API software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
| # | Platform | Score | Why | From | Free plan | Paid from | Deployment model | |
|---|---|---|---|---|---|---|---|---|
| 1 | Paperform | 7.4 | RecognisedAPIDocumented | $4.08/mo | Yes | 29 /mo | — | View |
| 2 | SurveyJS | 7.4 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 3 |  HeadlessForms | 7.3 | RecognisedAPIDocumented | $1,928/mo | Yes | 3.75 /mo | cloud | View |
| 4 |  Basin | 7.2 | RecognisedAPIDocumented | $1.04/mo | Yes | 12.5 /mo | cloud | View |
| 5 | Endatix | 7.2 | RecognisedAPIDocumented | $360/mo | Yes | 360 /mo | hybrid | View |
| 6 |  Formcarry | 7.2 | RecognisedAPIDocumented | $0.42/mo | Yes | 5 /mo | cloud | View |
| 7 |  Formidable | 7.2 | RecognisedAPIDocumented | $15/mo | Yes | 15 /mo | cloud | View |
| 8 |  Formspree | 7.2 | RecognisedAPIDocumented | $15/mo | Yes | 10 /mo | — | View |
| 9 | forms.app | 5.9 | RecognisedAPIDocumented | $19/mo | Yes | 19 /mo | — | View |
| 10 | Formsite | 5.8 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 11 | OpnForm | 5.8 | RecognisedAPIDocumented | $25/mo | Yes | 25 /mo | — | View |
| 12 | Feathery | 5.7 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 13 | Formester | 5.7 | RecognisedAPIDocumented | $13/mo | Yes | 12 /mo | — | View |
| 14 | FormKeep | 5.7 | RecognisedAPIDocumented | $4.99/mo | Yes | 4.99 /mo | — | View |
| 15 | Formsort | 5.7 | RecognisedAPIDocumented | $279/mo | Yes | 279 /mo | — | View |
| 16 |  FormBackend | 5.5 | RecognisedAPIDocumented | — | Yes | 5 /mo | cloud | View |
| 17 |  Web3Forms | 5.5 | RecognisedAPIDocumented | — | Yes | — | cloud | View |
| 18 |  Forminit | 5.4 | RecognisedAPIDocumented | — | Yes | 15.83 /mo | — | View |
| 19 |  Formspark | 5.4 | RecognisedAPIDocumented | — | Yes | — | cloud | View |
| 20 |  FormSubmit | 5.4 | RecognisedAPIDocumented | — | Yes | — | cloud | View |
| 21 | Form.io | 5.3 | RecognisedAPIDocumented | $220/mo | No | 300 /mo | — | View |
| 22 |  Forms & Workflow (OpenForms) | 5.1 | RecognisedAPIDocumented | — | — | — | cloud | View |
| 23 |  Formly | 5.0 | RecognisedAPIDocumented | $29/mo | No | 24 /mo | — | View |
| 24 |  FormTitan | 4.9 | RecognisedAPIDocumented | — | — | — | — | View |
| 25 |  Orbeon Forms | 4.7 | RecognisedAPIDocumented | — | — | — | — | View |
Is your platform 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 form API software is ranked first on Inferse?
Paperform is ranked #1 of 25 with a score of 7.4. SurveyJS is second and HeadlessForms third.
How many of these have a free plan?
15 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Formcarry has the lowest first paid tier we found: $0.42/mo.
How is this list ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it. Paid placements never change a rank.