The AI-powered Simplicity AI alternative
Simplicity AI is an AI form filler for arbitrary PDFs — upload any form, including tax, immigration, and legal documents, and have it populated for you in one pass.
Quick answer
Filly AI is a Simplicity AI alternative built for repeat work. Simplicity fills the document in front of you; Filly saves the client behind it, so every future form auto-fills from that profile. Filly also fills Word files, batch-fills across clients (up to 5 clients per run on Solo and 20 on Pro), and includes no-login e-signature.
Where Simplicity AI is strong
Simplicity AI is genuinely good at the unusual document: hand it a form nobody has templated, and it will find the fields and fill them without setup. For a one-off PDF that doesn't fit any library, that's exactly the right shape of tool.
Filly AI vs. Simplicity AI at a glance
| Feature | Filly AI | Simplicity AI |
|---|---|---|
| Free plan | Yes — 10 forms, 5 clients, 10 fills/mo, no card | Free trial, then paid |
| Reusable client profiles | Core feature — save a client once, reuse everywhere | Document-at-a-time, not client records |
| Batch fill (many clients at once) | Yes — up to 5 clients per run on Solo and 20 on Pro, one ZIP | Limited |
| AI field extraction | Yes — reads any PDF/DOCX, incl. scanned (OCR) | Yes |
| No-login e-signature | Yes — share a link, sign in any browser | Not the focus |
| Starting paid price | $19/mo (Solo) | Free trial, then paid |
| Best for | Professionals refilling the same clients' details across many forms | One-off or unusual PDFs with no template |
Why teams switch to Filly
The second form is the point
A document-at-a-time filler starts from zero every time. Filly saves the person once, so the next form — and the twentieth — fills itself from the same profile without re-entering anything.
Word documents too
Contracts, engagement letters, and intake packs often never existed as a PDF. Filly fills DOCX as well as PDF from the same client record.
Batch fill across clients
Generate the same form for many clients in one run, delivered as a single ZIP — up to 5 clients per run on Solo and 20 on Pro.
Signature is part of the flow
Share a no-login link, the recipient signs in any browser, and the signed copy comes back to you — no separate signing tool bolted on.
Try Filly free — no card
Fill your first forms today. 10 forms, 5 clients, 10 fills a month on the free plan.
Get startedFrequently asked questions
- What is a good Simplicity AI alternative?
- Filly AI is a Simplicity AI alternative for people who fill forms repeatedly rather than once. Both use AI to read and populate any PDF; Filly adds reusable client profiles so every future form fills from saved details, plus Word support, batch fill (up to 5 clients per run on Solo and 20 on Pro), and no-login e-signature, with a free plan to start.
- How is Filly AI different from Simplicity AI?
- The difference is what gets remembered. Simplicity AI is document-first — upload a form, it fills that form. Filly is client-first — save a person once and their details flow into any form you upload afterwards, including one the tool has never seen. Filly also covers Word documents and includes e-signature.
- Can Filly AI fill unusual or non-standard PDFs?
- Yes. Filly reads any PDF or Word document, uses OCR on scanned and flattened files, and extracts the fields with AI — no template needed. Anything it's unsure about is flagged by confidence so you can confirm it before exporting.
- Is Filly AI free to try?
- Yes. The free plan includes AI field extraction, up to 5 saved clients, and 10 filled documents per month with no credit card. Paid plans start at $19/month for higher limits, batch fill, and e-signature.
Other comparisons
Comparison based on publicly available information as of 2026. Product names and trademarks belong to their respective owners; Filly AI is not affiliated with or endorsed by Simplicity AI. Details change — verify current features and pricing on each provider's site.