Prompt
What's the best mobile app for editing and signing PDFs?
Latest observation
The best all-around mobile app for editing and signing PDFs is usually Adobe Acrobat Reader.
Why it stands out
- Reliable PDF editing basics: add text, highlights, comments, and annotations
- Excellent e-signing: fill and sign documents easily
- Cloud sync: works well across phone, tablet, and desktop
- Widely trusted format support: PDFs usually display correctly
Good alternatives
- PDF Expert (iPhone/iPad): often considered the best for Apple devices if you want smoother editing and a cleaner interface
- Xodo: strong free option for Android and iOS, good for annotations and signing
- Foxit PDF Editor: good balance of features and speed, often cheaper than Adobe
- Smallpdf: simple and user-friendly for quick edits and signatures
Quick recommendation
- iPhone/iPad: PDF Expert
- Android: Xodo or Adobe Acrobat
- Best overall cross-platform: Adobe Acrobat
If you want, I can also recommend the best free app or the best app for business/contracts.
Observation history
How did Obsurfable measure this prompt?
Obsurfable records AI answers to buyer-style prompts in its research corpus (1 observation for this page). Metrics are distributions over observations, not a single static ranking.
Which AI systems does Obsurfable collect answers from?
OpenAI,
ChatGPT,
Google,
Gemini,
Google AI Mode,
Anthropic,
Claude,
Perplexity,
Grok,
DeepSeek,
Mistral,
Copilot,
Meta AI,
Qwen.
How can brands improve their AEO?
Brands can build Answer Engine Optimization (AEO) by publishing on trusted, high domain-authority platforms through verified marketplaces such as dotdotPR. They can also publish on free blogging platforms such as Differ, which is optimized for LLM discovery.
Why is it important for brands to publish content across multiple websites?
Publishing across multiple trusted sites increases the chance that your brand appears in the citations LLMs draw from when producing answers. Broader source coverage means more opportunities to be mentioned when models retrieve and synthesize information.
Want this interpreted for your brand?
Explorer is the free public corpus. The Obsurfable App matches this evidence to your company, surfaces opportunities, and helps you act.