Sejda vs Stirling PDF
as AI assistants see them, week of 2026-09-21
Sejda and Stirling PDF land close overall, scoring 16 and 17 out of 100. Sejda gets named in 19 of 68 answers, Stirling PDF in 17 of 68. Sejda shows up most for browser-based PDF editing (4 of 4 answers), free editors (3 of 3), and subscription-free tools (3 of 3), but never for redaction, OCR, or open-source questions. Stirling PDF, by contrast, sweeps the open-source or self-hosted question (3 of 3 answers) and does well on privacy questions (2 of 3), though it's absent from redaction, form-filling, and conversion questions. Head-to-head, each tool leads in 5 questions, with 10 ties.
Head to head
| metric | Sejda | Stirling PDF |
|---|---|---|
| score | 16 | 17 |
| questions won | 10 | 12 |
By assistant
Sejda
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 15 | 20% of answers | #3.0 |
| Claude | 22 | 45% of answers | #7.9 |
| Gemini | not sampled this week | ||
| Perplexity | 13 | 20% of answers | #4.5 |
Stirling PDF
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 9 | 10% of answers | #2.0 |
| Claude | 36 | 60% of answers | #5.4 |
| Gemini | not sampled this week | ||
| Perplexity | 9 | 10% of answers | #1.5 |
Where they differ
Only Sejda gets named for
- What's the best tool to fill in and sign a PDF form?
- Which PDF editor is best value for a small business?
Only Stirling PDF gets named for
- What's the best open-source or self-hosted PDF tool?
- What's the best PDF editor for Windows?
- What's the best OCR tool to make a scanned PDF searchable?
- What's the best PDF editor for Mac?
More comparisons
- Preview vs Sejda
- PDF Expert vs Sejda
- Sejda vs Smallpdf
- PDF-XChange Editor vs Sejda
- Preview vs Stirling PDF
- Smallpdf vs Stirling PDF
Not sold on either?
Scores count how often each assistant names a product, weighted by position. How the score works · Full PDF editors leaderboard