MicBridge vs PDF Duo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MicBridge
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Dictate on your iPhone and the text is typed into whatever app is focused on your Mac or Windows PC — Word, a browser, a chat box, anything. Send images and files both ways too. It all runs on-device and over your own local network: no cloud, no account, no sign-up. WHAT IT DOES - Voice straight into the computer. Speech is recognised on your iPhone, shown as an editable draft, then typed as real keystrokes into the focused app the moment you tap Send. - Two-way file & photo transfer. Phone to computer and back. Images land on the computer clipboard ready to paste; send a file to the phone and it opens a Save/Share sheet. Large files stream without eating memory. - Cantonese, Mandarin and English dictation, switchable in one tap. WORKS WITHOUT WI-FI Corporate Wi-Fi that locks devices apart, a public hotspot with client isolation, or no network at all — turn on Bluetooth on both devices, scan the same QR, and you are connected. MicBridge types over Bluetooth when there is no usable Wi-Fi, so it keeps working in offices, hotels and on the road. (Bluetooth carries text; photos and files still need Wi-Fi.) PRIVATE BY DESIGN - Speech is processed entirely on-device and is never uploaded. - Text, images and files travel only over your local network, end-to-end encrypted with AES-GCM, to the computer you paired with. - No accounts, no cloud, no servers, no analytics. - Pairing keys stay on the device — Keychain on iOS, DPAPI on Windows. SET UP IN THREE STEPS 1. Open the free MicBridge companion on your Mac or Windows PC and choose Pair new device — a QR code appears. 2. On iPhone, tap Scan to pair and scan the QR. 3. Speak, review the draft, tap Send. The text types into your focused app. Tap the paperclip to send a photo or file. The desktop companion for macOS and Windows is a free download from the MicBridge site. MICBRIDGE PRO (OPTIONAL) - Monthly subscription: auto-renewable, cancel anytime in Settings. - Lifetime: one-time purchase, unlock forever. Prices are shown on the in-app purchase page. Terms of Use (EULA): https://micbridge.online/terms Privacy Policy: https://micbridge.online/privacy
PDF Duo
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PDF Duo is a free, beautifully crafted PDF reader and editor for iPhone, designed for iPhone Duo and foldable iPhones: open your Duo to read like a book with a real page curl, sign and fill forms, and mark up anything, privately on your phone. No account, no ads, no watermark. It works on every other iPhone and on iPad too. Reading, mark-up, form filling, signing and flattened export are all free, with no subscription. READ LIKE A BOOK Open your iPhone Duo to read a PDF like a book: two pages at once, with the spine on the real hinge. Turn pages with a real page curl; the page curls over the spine under your finger, in every pose. With Reduce Motion on, pages fade instead. Pinch to zoom into any page. The cover stands alone on the right, then pages 2–3, 4–5, as in a printed book. SIGN AND FILL Sign a PDF on iPhone with your finger, then drag, pinch and turn your signature into place. Save several signatures and initials; they stay on your phone. Fill in PDF forms field by field: text fields, checkboxes, radio buttons, dropdowns and lists, with Next field to move on. Add today's date or a line of text anywhere, or clear a form in one step. Flatten the PDF when you're done: send a copy with your signature, marks and form values burned into the page, so it can't be changed. Leases, contracts, school forms, delivery notes and invoices: signed and sent from your phone. MARK UP Highlight a PDF by running your finger along the text; underline and strike through the same way. Draw with the pen, or add text boxes, sticky notes, rectangles, ellipses, lines and arrows, in five colors and three opacities. Select, move or delete any mark, see every mark in one list, and undo or redo any change. Marks are saved as standard PDF annotations. A COMPLETE PDF READER Find any word and see every match with its line. Jump through the PDF's own contents, add bookmarks, browse thumbnails and a page grid, or scrub through the pages. Scroll continuously or read one page at a time; PDF Duo reopens where you left off. Compare two PDFs side by side across the fold, scrolling together. Connect iCloud Drive or any folder once and every PDF is there, or choose Open in PDF Duo from Files, Mail, Safari and Messages. Open password-protected PDFs. Rotate, delete, reorder and extract pages, or insert a blank page or a photo. DESIGNED FOR IPHONE DUO PDF Duo is designed for iPhone Duo and foldable iPhones, and fits each way you hold the phone: • Closed: read with one hand; the buttons stand in the Duo's own control column beside the clock. • Open as a book: two pages across the fold, a page curl over the spine, and no bar across the top. • Open upright: one large page, with a thumbnail rail under your thumb. • Half open like a laptop: the page stands above the fold, with thumbnails below, or the signature pad when you sign. Fold or rotate mid-document and you stay on the same page, with the same document and the same edit. iOS already shows a PDF as two pages on the open iPhone Duo with Quick Look. PDF Duo builds on that for reading and paperwork: a page curl over the spine, saved signatures, form filling field by field, your place remembered in every document, and a laptop pose for signing. PRIVATE BY DESIGN No account, no sign-in and no cloud service of ours. Your documents stay in your files, and PDF Duo opens them where they are. Signatures are kept only on this phone, in the Keychain, and are never synced or uploaded. It works offline, with no ads and no tracking. Unsaved changes come back after a crash, and every save is checked before it replaces your file. WHAT IT DOESN'T DO YET • Edit existing text or images in a PDF. You can sign, fill, highlight, draw, add text and notes, and reorder pages. • Certificate-based digital signatures. Your signature is a handwritten one, placed on the page. • Apple Pencil on iPhone Duo. • XFA forms and form scripts. • Selecting text straight in the book spread; pinch in and the page becomes selectable.
Screenshots
Verdict
The clearest difference is in-app purchases: PDF Duo at none against MicBridge's 2. 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. MicBridge sells 2 in-app purchases, starting at $1.99 per month. PDF Duo asks for nothing beyond the download.
| Parameter | MicBridge | PDF Duo |
|---|---|---|
| Price | Free | Free |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 3 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Ka Ming Ho | Alano Tech Pte. Ltd. |
In-app purchases
MicBridge
- MicBridge Pro$1.991 Month
- MicBridge Pro (Lifetime)$19.99
PDF Duo
No in-app purchases








