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Filly AI vs pdfFiller

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Entry price
Filly AI from $19/mo, pdfFiller from $8/seat/mo — different billing units, so no direct winner
Free plan
Only Filly AI (pdfFiller has paid plans only)
Public API
Both have one
Higher Trust score
pdfFiller — 92 vs 80 for Filly AI
Best fit
Filly AI: Immigration lawyers and paralegals filing the same forms repeatedly · pdfFiller: Teams that need PDF editing and e-signature in one subscription across devices

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

Filly AIReads a PDF or Word form with AI and auto-fills it from saved client profiles.pdfFillerBrowser-based PDF editor and e-signature tool from airSlate, with a REST API and native iOS, Android, and Mac apps.

Side by side

FactFilly AIpdfFiller
CategoryForm Filling & AutofillE-signature & Document Workflow
Pricing modelFreemiumPaid
Starts at$19/mo$8/seat/mo
Public APIYesYes
Trust score80 / 10092 / 100
PlatformsWeb, APIWeb, iOS, Android, macOS, API
CompanyCyrus Group Kft.airSlate Inc.
Last verifiedOct 15, 2026Oct 15, 2026

What our research says

Filly AI

Filly AI is built around a genuinely repetitive task, refilling the same form for different clients, and the batch mode plus e-signature step cover that workflow end to end. It's narrow by design, though: this is a forms tool, not a general document editor or contract analyzer.

Pros

  • Batch-fills the same form for multiple clients at once
  • Includes e-signature and basic PDF merge/split in the same tool
  • Free tier requires no card to try 10 forms
  • Operator and country are clearly disclosed (Cyrus Group Kft., Hungary)

Cons

  • Free plan's 10 fills a month is thin for daily professional use
  • Scope is limited to forms; it is not a general PDF editor or e-signature platform on its own

pdfFiller

pdfFiller covers the ordinary PDF-editing-plus-signature workflow well: fill fields, merge and convert files, collect signatures, and sync across a web editor and native mobile/desktop apps. It's an established airSlate product with a real API for teams that want to automate document handling rather than click through a UI. The catch is that the official pricing page didn't surface exact figures during this check, so the entry price here comes from third-party trackers rather than the vendor directly.

Pros

  • Native apps for iOS, Android, and Mac in addition to the web editor, so documents follow you across devices
  • Documented REST API with OAuth 2.0 authentication for filling, signing, and converting documents programmatically
  • 30-day free trial before any card is charged

Cons

  • Official pricing did not surface on the site during this check — the confirmed number comes from third-party trackers, not the vendor page
  • Monthly, non-annual billing carries a documented markup over the annual rate

Which one fits

Choose Filly AI if you need

  • Immigration lawyers and paralegals filing the same forms repeatedly
  • HR and insurance staff processing many client forms per week

Choose pdfFiller if you need

  • Teams that need PDF editing and e-signature in one subscription across devices
  • Developers automating document fill/sign workflows via API

Filly AI vs pdfFiller: the questions people ask

Is Filly AI cheaper than pdfFiller?

They charge in different units, so there is no like-for-like answer: Filly AI starts at $19/mo, pdfFiller at $8/seat/mo. Entry price is the lowest paid plan as we last verified it.

Does Filly AI or pdfFiller have a free tier?

Filly AI has a free tier; pdfFiller has paid plans only.

Which has a public API, Filly AI or pdfFiller?

Both ship a public API, so either can be built on; the fact table above shows the platforms each one runs on.

Browse all Form Filling & Autofill →