The AI-powered UPDF alternative
UPDF is a cross-platform PDF editor with an AI assistant that summarises, translates and explains documents, usually sold as an inexpensive licence covering Windows, Mac, iOS and Android.
Quick answer
Filly AI is a UPDF alternative for filling rather than reading. UPDF's AI helps you understand a document; Filly's AI completes one, using details you saved once so every future form fills itself — then batch-fills across clients and collects a signature. A workflow rather than an editor.
Where UPDF is strong
UPDF is polished and unusually good value, and its AI is genuinely useful for making sense of a document — summarising a long contract, translating one, explaining a clause. Covering every platform on one licence is hard to beat on price.
Filly AI vs. UPDF at a glance
| Feature | Filly AI | UPDF |
|---|---|---|
| Free plan | Yes — 10 forms, 5 clients, 10 fills/mo, no card | Licence or subscription |
| Reusable client profiles | Core feature — save a client once, reuse everywhere | Document-at-a-time |
| 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 | Yes |
| Starting paid price | $19/mo (Solo) | Licence or subscription |
| Best for | Professionals refilling the same clients' details across many forms | Reading, editing and annotating PDFs across devices |
Why teams switch to Filly
Reading a form and completing it are different jobs
UPDF's assistant is built to summarise and explain. Filly's is built to map your data onto the right fields and flag the ones it is unsure about — the part that actually costs you an afternoon.
Your saved data does the work
Save a client once and every form you upload afterwards fills from that profile, including a form neither you nor Filly has seen before.
Signature is in the flow
Send a no-login link, the recipient signs in any browser, and the signed copy returns to you — without adding a separate e-sign product.
Batch across clients
Produce the same document for many people in one run — up to 5 clients per run on Solo and 20 on Pro.
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 UPDF alternative?
- Filly AI is a UPDF alternative when the job is filling forms rather than reading or editing them. It reads any PDF or DOCX, including scans via OCR, and fills it from reusable client profiles you save once, with batch fill and no-login e-signature. Free plan, then $19/month.
- How is Filly AI's AI different from UPDF's AI assistant?
- UPDF's assistant is oriented around comprehension — summarising, translating and explaining a document. Filly's is oriented around completion — identifying every field, mapping your saved data onto it, and marking anything low-confidence for you to confirm before export.
- Can Filly AI edit or annotate PDFs like UPDF?
- No. Filly fills forms and overlays values onto the original document; it does not annotate, redact, convert formats or rearrange pages. If you need a general editor, UPDF is a strong and inexpensive one — the two solve different problems.
- Does Filly AI need installing?
- No. Filly runs entirely in the browser, so there is no app to install on each device and no licence to move between machines. You sign in and your saved clients and forms are there.
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 UPDF. Details change — verify current features and pricing on each provider's site.