STL Viewer vs PDF Merger
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
STL Viewer
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STL Viewer transforma seu iPhone ou iPad em uma estação profissional de inspeção de modelos 3D. Abra arquivos STL binários ou ASCII e analise a geometria com uma experiência Metal fluida, criada para engenharia, impressão 3D, prototipagem, educação e revisão técnica. VISUALIZAÇÃO PROFISSIONAL • Rotação, deslocamento e zoom multitoque • Vistas isométrica, frontal, traseira, lateral, superior e inferior • Modos sólido, wireframe, sólido + wireframe, X-Ray e orientação de normais • Materiais profissionais e ambientes de alto contraste INSPEÇÃO E MEDIÇÃO • Medição precisa entre pontos selecionados diretamente na superfície • Plano de corte interativo nos eixos X, Y e Z • Dimensões gerais, área superficial e volume • Contagem de triângulos e vértices únicos • Unidades STL atribuídas pelo usuário, sem suposições silenciosas SAÚDE DA MALHA • Diagnóstico de malha fechada • Detecção de arestas abertas e não manifold • Identificação de faces degeneradas • Classificação visual da integridade do modelo RELATÓRIOS STUDIO • Relatório técnico em PDF gerado no próprio aparelho • Campos de projeto, empresa e responsável • Resumo de geometria e saúde da malha pronto para compartilhar PRIVACIDADE LOCAL-FIRST Seus modelos são processados localmente. A geometria não é enviada para nossos servidores. O plano gratuito permite abrir, navegar e visualizar arquivos STL. Pro libera inspeção e medição avançadas. Studio adiciona relatórios técnicos em PDF. Assinaturas podem ser canceladas a qualquer momento nos ajustes da App Store. by Transfer.med.br
PDF Merger
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PDF Merger 2.0 is the fastest, most private way to combine, split, compress, scan, OCR, and sign PDFs on iPhone and iPad — now with built-in AI Chat powered by Gemini. — NEW IN 2.0 — • AI Chat (Gemini 2.5 Flash-Lite) — Ask any PDF anything. Summaries, lookups, totals, translations. Opt-in, with no chat history stored on our servers. 5 free questions/week. • OCR (on-device) — Recognise text on scanned PDFs in 30+ languages. Searchable, copyable, exportable. • Page Extraction — Pull any page into its own PDF in one tap. • Page Numbering — Add numbers to every page with custom format & position. • E-Signature — Stamp a saved signature image with date. • Cover Page Bundler — Auto-generate a cover with title + table of contents. • Insert Blank Page — Perfect for chapter breaks. • 40+ Languages — Fully localized UI and App Store keywords. • iPad Polished — Sidebar layout, drag-and-drop, Apple Pencil ready. — CORE FEATURES — • Merge PDFs — Drag, drop, and reorder unlimited files into one PDF. • Split PDFs — Extract page ranges or single pages with one tap. • Compress PDFs — Shrink size up to 80% while preserving readability. • Rotate Pages — Fix sideways scans, per-page or in batch. • Add Watermark — Text or image, adjustable opacity and position. • Password Lock — AES-128 encrypted PDFs. • Document Scanner — Camera-to-PDF with auto-crop and perspective correction. • JPG to PDF — Photos to PDF with auto-cropping. • PDF to Images — Each page as JPG or PNG. • Apple Intelligence — Smart Summary + Auto-Rename, fully on-device. — PRIVACY-FIRST — • PDF processing stays 100% on your device. • AI Chat is opt-in. When enabled, only the text of the PDF you're asking about is sent to Gemini, cached for 1 hour, and never stored beyond that. • No tracking, no analytics, no advertising. • Files live in your private app sandbox; deleted when you delete them. — PRO TIER (optional) — Unlock unlimited merges, larger batches, watermark removal, password protection, document scanner, OCR, e-signature, AI Chat, Apple Intelligence Smart Summary, and every new feature with a single subscription or one-time Lifetime purchase. • Weekly — try Pro for less than a coffee • Yearly — save 70% • Lifetime — pay once, own forever Subscriptions auto-renew unless cancelled at least 24 hours before the renewal date. Payment is charged to your Apple ID. Manage in Settings → Apple ID → Subscriptions. — DESIGNED FOR iOS — • Built natively with SwiftUI + PDFKit for iOS 17+. • Optimized for iPhone, iPad, and Apple Pencil. • Full Dark Mode support. • Dynamic Type accessibility throughout. • VoiceOver labels on every interactive control. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.freeprivacypolicy.com/live/dca821a0-9b8b-48a6-9565-d1c64344a313
Screenshots
Verdict
The clearest difference is in-app purchases: STL Viewer at none against PDF Merger's 3. PDF Merger's advantage is update cadence (every 9 months vs every 43 months). On price, ads, device support and iOS requirement 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 Merger sells 3 in-app purchases, starting at $1.99 per 7 days. STL Viewer asks for nothing beyond the download.
STL Viewer ships an update every 43 months, PDF Merger every 9 months. The most recent releases landed on October 8, 2026 and October 7, 2026 respectively.
| Parameter | STL Viewer | PDF Merger |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 43 months | Every 9 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 4 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Felipe Marques de Barros | Ahmet Bostancklioglu |
In-app purchases
STL Viewer
No in-app purchases
PDF Merger
- Pro — Weekly3 Days trial$1.997 Days
- Pro — Yearly$29.991 Year
- PDF Merger Lifetime$59.99









