Best Form API Software in 2026
Updated
In short: Paperform is ranked #1 of 25 as of 4 October 2026, ahead of Endatix and Basin. The best-ranked option with a free plan is Endatix. The lowest first paid tier on this page is Basin at $2.01/mo.
Form API software helps gather responses and connect submitted information with other systems or workflows. Compared on conditional logic, file uploads, electronic signatures, and webhooks, the entries also specify deployment model and monthly submission volume. Free-plan availability and paid-from pricing offer useful cost context. Paperform, Endatix, and Basin are options to weigh against the forms you need to build and what respondents must provide. Consider whether conditional paths or signatures matter, how you plan to deploy the software, and what should happen once a response arrives.
25 form API software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
25ranked
16free plans on this page
$2.01/molowest paid tier
4 Oct 2026last checked
Input list Form API Software 25 channels on this page · 93 of 200 spec lines stated by the makers
Ch Tool Free planPaid fromDeployment modelMonthly submissionsConditional logicWebhooksFile uploadsElectronic signatures Spec sheet Score
01 Paperform Free planYesPaid from$29/moDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 3/8spec lines stated 7.4
02 Endatix Free planYesPaid from$360/moDeployment modelhybridMonthly submissionsnot statedConditional logicYesWebhooksYesFile uploadsYesElectronic signaturesYes 7/8spec lines stated 7.3
03 Basin Free planYesPaid from$12.5/moDeployment modelcloudMonthly submissions$250/moConditional logicYesWebhooksYesFile uploadsYesElectronic signaturesnot stated 7/8spec lines stated 7.1
04 forms.app Free planYesPaid from$19/moDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 3/8spec lines stated 7.0
05 SurveyJS Free planYesPaid fromnot statedDeployment modelnot statedMonthly submissionsnot statedConditional logicYesWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 3/8spec lines stated 7.0
06 HeadlessForms Free planYesPaid from$3.75/moDeployment modelcloudMonthly submissions$100/moConditional logicYesWebhooksYesFile uploadsYesElectronic signaturesnot stated 7/8spec lines stated 6.9
07 FormBackend Free planYesPaid from$5/moDeployment modelcloudMonthly submissions$1,000/moConditional logicNoWebhooksYesFile uploadsYesElectronic signaturesnot stated 7/8spec lines stated 6.8
08 Formcarry Free planYesPaid from$5/moDeployment modelcloudMonthly submissions$500/moConditional logicnot statedWebhooksYesFile uploadsYesElectronic signaturesnot stated 6/8spec lines stated 6.8
09 Formidable Free planYesPaid from$15/moDeployment modelcloudMonthly submissions$5,000/moConditional logicYesWebhooksYesFile uploadsnot statedElectronic signaturesnot stated 6/8spec lines stated 6.8
10 Formspree Free planYesPaid from$10/moDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsnot statedElectronic signaturesnot stated 2/8spec lines stated 6.8
11 OpnForm Free planYesPaid from$25/moDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 3/8spec lines stated 6.8
12 Formsite Free planYesPaid fromnot statedDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 2/8spec lines stated 6.7
13 Form.io Free planNoPaid from$300/moDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 3/8spec lines stated 6.6
14 Formester Free planYesPaid from$12/moDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 3/8spec lines stated 6.6
15 FormKeep Free planYesPaid from$4.99/moDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 3/8spec lines stated 6.6
16 Formsort Free planYesPaid from$279/moDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 3/8spec lines stated 6.6
17 Feathery Free planYesPaid fromnot statedDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 2/8spec lines stated 6.5
18 Forms & Workflow (OpenForms) Free plannot statedPaid fromnot statedDeployment modelcloudMonthly submissionsnot statedConditional logicYesWebhooksnot statedFile uploadsnot statedElectronic signaturesnot stated 2/8spec lines stated 5.8
19 Forminit Free planYesPaid from$15.83/moDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 3/8spec lines stated 5.7
20 Formly Free planNoPaid from$24/moDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 3/8spec lines stated 5.7
21 Formspark Free planYesPaid fromnot statedDeployment modelcloudMonthly submissionsnot statedConditional logicnot statedWebhooksYesFile uploadsNoElectronic signaturesnot stated 4/8spec lines stated 5.7
22 Web3Forms Free planYesPaid fromnot statedDeployment modelcloudMonthly submissions$5,000/moConditional logicnot statedWebhooksYesFile uploadsYesElectronic signaturesnot stated 5/8spec lines stated 5.7
23 FormSubmit Free planYesPaid fromnot statedDeployment modelcloudMonthly submissionsnot statedConditional logicnot statedWebhooksYesFile uploadsYesElectronic signaturesnot stated 4/8spec lines stated 5.6
24 FormTitan Free plannot statedPaid fromnot statedDeployment modelnot statedMonthly submissionsnot statedConditional logicYesWebhooksnot statedFile uploadsYesElectronic signaturesnot stated 2/8spec lines stated 5.5
25 Orbeon Forms Free plannot statedPaid fromnot statedDeployment modelnot statedMonthly submissionsnot statedConditional logicnot statedWebhooksnot statedFile uploadsnot statedElectronic signaturesnot stated 0/8spec lines stated 5.2
Compare all 25 in a table
| # | Tool | Score | Free plan | From | Free plan | Paid from | Deployment model | Monthly submissions |
|---|---|---|---|---|---|---|---|---|
| 1 | Paperform | 7.4 | Free plan | $29/mo | Yes | 29 /mo | — | — |
| 2 | Endatix | 7.3 | Free plan | $360/mo | Yes | 360 /mo | hybrid | — |
| 3 | Basin | 7.1 | Free plan | $2.01/mo | Yes | 12.5 /mo | cloud | 250 /mo |
| 4 | forms.app | 7.0 | Free plan | $19/mo | Yes | 19 /mo | — | — |
| 5 | SurveyJS | 7.0 | Free plan | — | Yes | — | — | — |
| 6 | HeadlessForms | 6.9 | Free plan | $1,928/mo | Yes | 3.75 /mo | cloud | 100 /mo |
| 7 | FormBackend | 6.8 | Free plan | $5/mo | Yes | 5 /mo | cloud | 1,000 /mo |
| 8 | Formcarry | 6.8 | Free plan | $5/mo | Yes | 5 /mo | cloud | 500 /mo |
| 9 | Formidable | 6.8 | Free plan | $15/mo | Yes | 15 /mo | cloud | 5,000 /mo |
| 10 | Formspree | 6.8 | Free plan | $15/mo | Yes | 10 /mo | — | — |
| 11 | OpnForm | 6.8 | Free plan | $25/mo | Yes | 25 /mo | — | — |
| 12 | Formsite | 6.7 | Free plan | Free | Yes | — | — | — |
| 13 | Form.io | 6.6 | No | $220/mo | No | 300 /mo | — | — |
| 14 | Formester | 6.6 | Free plan | $13/mo | Yes | 12 /mo | — | — |
| 15 | FormKeep | 6.6 | Free plan | $4.99/mo | Yes | 4.99 /mo | — | — |
| 16 | Formsort | 6.6 | Free plan | $279/mo | Yes | 279 /mo | — | — |
| 17 | Feathery | 6.5 | Free plan | Free | Yes | — | — | — |
| 18 | Forms & Workflow (OpenForms) | 5.8 | No | — | — | — | cloud | — |
| 19 | Forminit | 5.7 | No | — | Yes | 15.83 /mo | — | — |
| 20 | Formly | 5.7 | No | $29/mo | No | 24 /mo | — | — |
| 21 | Formspark | 5.7 | No | — | Yes | — | cloud | — |
| 22 | Web3Forms | 5.7 | No | — | Yes | — | cloud | 5,000 /mo |
| 23 | FormSubmit | 5.6 | No | — | Yes | — | cloud | — |
| 24 | FormTitan | 5.5 | No | — | — | — | — | — |
| 25 | Orbeon Forms | 5.2 | No | — | — | — | — | — |
Is your tool on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which form API software is ranked first on Specifiction?
Paperform is ranked #1 of 25 with a score of 7.4. Endatix is second and Basin third.
How many of these have a free plan?
16 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Basin has the lowest first paid tier we found: $2.01/mo.
How is this list ranked?
Ranked on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.