Instafill and Filly AI both use AI to detect fields on a PDF and fill them from reusable profiles, so they compete for the same searches. The real difference isn’t the fill engine — it’s who each one is built and priced for. Instafill is an enterprise-grade tool aimed at regulated, high-volume teams. Filly AI puts the same core workflow — fill from a saved profile, then sign — within reach of solo professionals and small firms.
Choose Instafill if you’re an enterprise or regulated team (healthcare, insurance, high-volume operations) that needs HIPAA compliance with BAA, a REST API, and CRM integrations, and can budget from $99/month. Choose Filly AI if you want affordable AI form-filling that also signs: free to start and $19/month, with reusable client profiles, no-login e-signature, Word support, and a built-in library of government forms. Filly gives individuals and small teams the same everyday workflow at a fraction of the price.
What’s the core difference?
Both tools read a form, map your saved data onto it, and handle scanned or flattened PDFs. Where they part ways is positioning. Instafill is priced and built for organizations — document-metered plans, HIPAA with BAA signing, an API, and Salesforce/Monday integrations — starting at $99/month. Filly AI is built for the person doing the paperwork: a genuinely free tier with AI, a $19/month entry plan, and e-signature included from the start. If you fill forms for clients but don’t need an enterprise compliance stack, the price gap is the headline.
Filly AI vs Instafill: feature comparison
| Feature | Filly AI | Instafill |
|---|---|---|
| Starting paid price | $19/month | $99/month |
| Free plan with AI fills | Yes — 10 AI fills/month, no card | Limited free version |
| Reusable client profiles | Yes | Yes |
| AI detection on scanned / flat PDFs | Yes — OCR + AI | Yes |
| Word (.docx) support | Yes | Yes |
| E-signature | Yes — no-login link, included from $19 | Yes — on the $299 Business tier |
| Built-in government-form library | Yes — W-9, W-4, I-9 and more, plus 25 templates | No — you upload your own forms |
| AI template generation (describe a doc → template) | Yes | No — fills existing forms only |
| Batch fill (one form, many people) | Yes — by saved client | Yes — from CSV/XLSX |
| API, webhooks & CRM integrations | Not yet | Yes — API, webhooks, Salesforce, Monday, browser extensions |
| Formal compliance certifications | GDPR posture; certifications on the roadmap | HIPAA (with BAA), ISO 27001 |
When is Instafill the better choice?
Instafill is the stronger pick for organizations with compliance and scale requirements. If you work in healthcare or insurance and need a signed BAA and HIPAA compliance, need to fill forms programmatically through an API or push data in from Salesforce or Monday, or process high volumes with row-by-row spreadsheet batches and self-learning accuracy, Instafill is built for exactly that. It’s a mature product with a deep feature set, and its higher price reflects an enterprise audience. If your team can justify $99–$299/month for those capabilities, it earns it.
When is Filly AI the better choice?
Filly AI is built for the people Instafill’s pricing leaves out: solo lawyers and paralegals, small firms, freelancers, HR teams of one, and anyone who fills forms for clients without an enterprise budget. You get the core workflow — save a client once, fill any form from their profile — plus the parts that usually cost extra elsewhere: e-signature is included from the $19 plan (not gated behind a $299 tier), real government forms are ready to fill, Word documents are supported, and you can describe a document and have Filly generate a fillable template. There’s a free plan with AI so you can try it on your own paperwork first. Signing matters here too: about 79% of e-signed agreements are completed within 24 hours, versus days for print-and-scan.
How do the prices compare?
Filly AI runs free, then $19 (Solo), $39 (Pro), and $79 (Enterprise) per month. Instafill starts at $99 (Professional) and $299 (Business) per month, metered by completed documents, with annual billing saving 20%. For an individual or small team, Filly delivers the same day-to-day filling-and-signing workflow at roughly a fifth of the entry price — and its free tier includes AI, which Instafill’s limited free version restricts. See Filly’s pricing.
Frequently asked questions
Is Filly AI just a cheaper Instafill?
They share a core — AI field detection and reusable profiles — but they’re aimed at different buyers. Instafill adds an enterprise layer (HIPAA/BAA, API, CRM integrations) and prices for it. Filly focuses on the everyday fill-and-sign workflow for individuals and small teams, and adds things Instafill doesn’t have: a built-in government-form library and AI template generation.
Does Filly AI have an API or HIPAA compliance?
Not yet. Filly has a strong GDPR posture (data deletion, EU residency, a public security page) but no formal HIPAA or ISO certifications, and no public API today. If you require a signed BAA or programmatic access, Instafill currently covers those; Filly’s roadmap includes both.
Both offer e-signature now — what’s the difference?
Availability and price. Filly includes no-login e-signature from its $19 plan; Instafill offers e-signature on its $299 Business tier. For anyone who mainly needs to fill a form and get it signed, Filly delivers that end to end at the entry price.
Can I try Filly AI before paying?
Yes — the free plan includes 10 AI fills a month with no credit card. Try it on a ready-made template or upload your own form.