PDF Expert vs STA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PDF Expert
This app allows you to edit, annotate, fill out forms, and convert PDF documents. It offers AI-powered summarization and analysis, along with tools to merge, sign, and protect your files. Work seamlessly across Apple devices with a user-friendly interface.
- Edit PDF text and images
- Annotate and highlight PDFs
- Fill out PDF forms
- Convert files to and from PDF
- AI-powered summarization and analysis
- Merge and combine PDF files
- Sign documents with e-signatures
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PDF Expert is a fast and easy PDF app to read, annotate, fill and sign PDF forms, convert files to PDF, and merge, split or compress documents – all in one intuitive app for iPhone, iPad, Mac & Vision Pro. Read PDF files with comfort, highlight and mark up text, fill out forms, sign contracts, create and convert PDFs, and summarize long documents in seconds with AI-powered tools. Unlock unlimited possibilities with PDF Expert Premium and work across all your Apple devices. "PDF Expert is one of my must-have iPad apps and a desktop-class PDF reader." – MacStories "The best app for managing, editing, and reading PDFs on your iPad." – The Sweet Setup ▶ WITH PDF EXPERT, YOU CAN: READ PDFs - PDF reader with Day, Night, and Sepia modes for comfortable reading anytime - Scroll PDFs vertically or horizontally and search text in any document - Open and view PDF files from email, web, Files, or any app via the Share menu - Read PDFs out loud with Text to Speech ANNOTATE AND MARK UP PDFs - Highlight, underline, and strike through text in your PDFs - Mark up documents with pen, shapes, text, notes, and comments - Add stamps such as Approved or Confidential - Record your voice and add audio notes to PDFs FILL AND SIGN PDF FORMS - Fill out PDF forms with text fields, checkboxes, and radio buttons - Sign PDF documents in seconds – draw your signature or add it from an image - Save your signature to sign contracts, agreements, invoices, and applications faster - Fill, sign, and send forms right from your iPhone – no printing or scanning needed - Supports all major form formats, including AcroForms and static XFA forms ***PREMIUM FEATURES*** EDIT PDFs - Edit text directly in a PDF – just as you would in a Word document - Add, replace, and resize images in your PDFs - Add links to other pages or websites - Add outlines to navigate large PDFs CREATE AND CONVERT PDFs - Create PDFs from Word files, images, and other documents - Convert Word to PDF, JPG to PDF, and PNG to PDF in seconds - Convert PDF to Word, Excel, PowerPoint, JPG, PNG, and TXT MERGE, SPLIT AND ORGANIZE PDFs - Merge and combine multiple PDF files into one - Split PDFs and extract pages into a new file - Add, delete, rotate, and reorder pages with thumbnail preview COMPRESS PDFs - Compress PDFs to reduce file size for email and sharing - Shrink large PDF files to save space on your device SUMMARIZE PDFs WITH AI – PDF COPILOT - List Main Points – get key takeaways from any PDF - Summarize – get concise summaries of entire PDFs or annotations - Ask Anything – find details with AI answers and references - Explain – get instant explanations of words or phrases PROTECT YOUR FILES - Password-protect PDF Expert - Redact – permanently black out sensitive information WORK WITH SCANNED DOCUMENTS - Open scanned PDFs to fill out, sign, annotate, and share CONSTRUCTION TOOLS - Scale and measure drawings with the Measure tab - Polygon, polyline, and redline tools MORE FEATURES - Customizable toolbar - Presentation Mode - Print and share PDFs via email or cloud ONE ACCOUNT FOR ALL YOUR APPLE DEVICES One Premium subscription covers PDF Expert on iPhone, iPad, and Mac – no need to buy versions separately. Read more about our terms and conditions here: https://pdfexpert.com/privacy https://pdfexpert.com/terms Don’t hesitate to reach out to us at http://readdle.com/contact
STA
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S.T.A est une solution d’affaire complète de gestion de temps et présence muni d'une application mobile parfaite pour les employés et employeurs. S.T.A calcul de façon efficace le temps à payer selon vos règles d’entreprise. Notre solution est complète et a fait ses preuves depuis plus de 20 ans. Au-delà de la gestion du temps et présences, nous vous permettons d’avoir une vue d’ensemble sur la gestion de vos ressources humaines dans le but d’améliorer la prise de décisions au quotidien et de vous faire sauver du temps et de l’argent. De plus, S.T.A s’intègre facilement aux différentes solutions de paie et de comptabilité comme Acomba, Employeur D, Avantage, Nethris, Neova, Famous et Insync. Dans un monde de plus en plus connecté, il est nécessaire de prendre avantages des technologies mobiles pour répondre aux besoins des différents types d’industries. Que vos employés soient sur la route, en télétravail ou tout simplement sur un chantier ils peuvent facilement faire parvenir leurs poinçons avec ou sans géolocalisation et ce en temps réel. Permettez à vos employés de : -Poinçonner leurs heures de travail en temps réel sur la route, en télétravail, sur un chantier, aux champs ou toute autres endroits ou vos activités les mèneront -Consulter leurs horaires de travail passé et à venir pour améliorer la communication des quarts de travail -Consulter le détail de leurs heures travaillés et réduisez les questionnements sur la paie -Saisir leurs productivités pour connaitre en temps réel l'avancement de vos projets -Complété des demandes de banques de temps pour simplifier vos processus RH Et bien plus encore!
Screenshots
Verdict
The clearest difference is in-app purchases: STA at none against PDF Expert's 12. STA also leads on iOS requirement (11.0 vs 16.0). PDF Expert's advantage is update cadence (fortnightly vs every 6 weeks) and chart position (#64 vs unranked). On price there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. PDF Expert sells 10 in-app purchases, starting at $9.99 per month. STA asks for nothing beyond the download.
PDF Expert ships an update fortnightly, STA every 6 weeks. The most recent releases landed on October 15, 2026 and October 11, 2026 respectively.
| Parameter | PDF Expert | STA |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (216K ratings) — better | — |
| Positive reviews | 45.5% of reviews | — |
| Number of ratings | 216K — better | — |
| Update frequency | Fortnightly — better | Every 6 weeks |
| Ads | No | — |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Best chart rank | #64 — better | — |
| Devices | iPhone, iPad — better | — |
| Requires iOS | 16.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 295 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Readdle Technologies Limited | Cyberlog inc |
Bugs and requests
PDF Expert
Reported bugs
4 issues- Corrupted PDFs after editing
- Sync issues with cloud storage providers
- Unexpected loss of annotations and edits
- Unreliable performance on older iPad models
Requested features
5 requests- Improved palm rejection for Apple Pencil
- Customizable toolbar and annotation presets
- Better integration with other productivity apps
- More flexible file management and organization
- Ability to create fillable PDF forms
STA
Not enough reviews yet to summarise bugs or requests.
In-app purchases
PDF Expert
- PDF Expert Premium Trial7 Days trial$9.991 Month
- PDF Expert Premium No Trial$9.991 Month
- PDF Expert for Education7 Days trial$39.991 Year
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- PDF Expert Premium7 Days trial3 variants$49.991 Year
- PDF Expert Premium New7 Days trial$49.991 Year
- PDF Expert Premium Existing7 Days trial$49.991 Year
- PDF Expert – Premium Editing1 Year trial$49.991 Year
- PDF Expert Mac & iOS Pro7 Days trial$79.991 Year
- PDF Expert Mac & iOS7 Days trial$79.991 Year
- PDF Expert Basic$9.99
STA
No in-app purchases









