Comparison

TopicFlow vs SignBack

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

TopicFlow

This app transforms AI conversations into structured, reusable notes, plans, and summaries. It allows users to branch discussions for focused follow-ups and capture key ideas before they are lost. Organize your AI-generated content locally and export it when ready.

Highlights
  • Transform AI chats into reusable notes
  • Branch conversations for focused follow-ups
  • Capture and organize key ideas
  • Refocus AI discussions without re-prompting
  • Export and share selected content
  • Local topic history organization
  • Connect own AI provider keys
Features
Read full description

TopicFlow turns AI chats into reusable notes, plans, outlines, decisions, and summaries. Instead of leaving every AI conversation as one long thread, TopicFlow gives your thinking structure. Keep your main line clear, branch into focused follow-up chats, then bring the strongest results back into reusable work. What you can do with TopicFlow: - Capture ideas before they disappear from long chat threads. - Branch AI chats for questions, alternatives, research notes, and next steps. - Refocus a conversation without rewriting prompts from scratch. - Turn selected discussion into notes, plans, requirements, decision records, or summaries. - Organize topic history locally on your device. - Use TopicFlow subscription access for DeepSeek-powered AI inside the app. - Export and share only when you choose. - Back up to your own iCloud or Google Drive app data space when backup is enabled. TopicFlow is built for writers, founders, builders, students, and independent thinkers who want AI conversations to produce durable work instead of disposable chat history. Important: TopicFlow subscription access unlocks the app workflow and hosted DeepSeek-powered AI features. AI availability, quotas, fees, rate limits, output rules, and terms may still be governed by DeepSeek and app store purchase rules. Terms of Use (EULA): https://specaxe.com/terms

About

SignBack

Effortlessly sign and fill out documents on your device without printing or scanning. Create multiple identities for different roles and use the smart assistant to quickly complete forms. All processing is done locally for maximum privacy.

Highlights
  • 100% free access
  • Secure local processing
  • Multiple identities
  • Smart fast fill assistant
  • Multi-format support
  • Sign and send back in one tap
  • Scan paper documents
Features
Read full description

Stop printing. Stop scanning. Stop turning a simple signature into a whole project. SignBack turns paperwork into a clean signed PDF from your iPhone or iPad. Open a PDF, fill the blanks, sign, and send it back without a SignBack account, subscription, or watermark. Use it for contracts, leases, government forms, waivers, intake forms, vendor paperwork, and everyday PDFs. No account. No server upload for document processing. No watermark on exported PDFs. KEY FEATURES PRIVATE BY DESIGN • Your signing workflow happens on your device. Documents are not uploaded to a SignBack server for opening, filling, signing, converting, or exporting. Nothing leaves until you choose to share the finished file. OPTIONAL iCLOUD SYNC • Keep your Signature Wallet, Signing Identities, Templates, profile name, and folder structure in sync across your own devices through your private iCloud. Sync is off by default, there is no SignBack account, and everything is encrypted on-device before upload. First sync gives you merge, replace, and review options so you stay in control. SMARTER FAST FILL • Fast Fill highlights likely fields on many forms, including signature lines, printed names, dates, initials, emails, phone numbers, addresses, and checkboxes. It now adapts to document complexity with confidence guidance, helping find fields on dense forms like W-9s while avoiding instruction pages and false fill spots. TAP-TO-ADD EDITING • Tap anywhere on a document to quickly add signatures, dates, text, and checkmarks. The redesigned bottom sheet includes identity-aware Quick Fill, inline text editing, floating size controls, and a cleaner color palette so you can finish documents faster without switching screens. SCAN MULTI-PAGE DOCUMENTS • Use your camera to scan paper forms, contracts, notices, receipts, and multi-page documents. Turn pages into a clean PDF you can fill, sign, save, and send back. OPEN MORE THAN PDFs • Open PDFs, Word documents, Pages files, text files, photos, and scans. Supported files convert into clean PDFs on-device so you can finish the paperwork that actually arrives. SIGNING IDENTITIES FOR REAL ROLES • Create saved identities for personal, work, LLC manager, trustee, property manager, agent, and other signing roles. Each identity can fill the right contact details and signature block when needed, and Signing Identities can be protected with Face ID. SIGNATURE WALLET • Draw or type your signature and initials once, then reuse them across documents. Signatures render with natural pen-like ink, smooth strokes, and tapered ends. Optional device authentication can help protect your app and signature wallet. ORGANIZE YOUR PAPERWORK • Save reusable templates for forms you handle often • Organize documents into folders • Use Apartment, Rental, and custom folder categories • Keep separate signing roles and reusable details • Access SignBack from the share sheet, home-screen widget, and Siri Shortcuts SEND BACK A CLEAN PDF • When you are done, Send Back flattens your fields into the document and opens the share sheet. Large PDFs can be compressed while still letting you send the original with iCloud Mail Drop if you prefer. ON-DEVICE DOCUMENT SUMMARIES • On supported devices, SignBack can use Apple Intelligence to summarize a document and surface key points before you sign. Requires compatible hardware, supported system software, Apple Intelligence enabled, and the model available. Summaries may be incomplete and do not replace reading the original document or getting professional advice. ACCESSIBLE PAPERWORK TOOLS • SignBack includes improved VoiceOver support across sync settings, Fast Fill, the PDF editor, folder picker, and identity list. The next time someone says “just sign this and send it back,” do exactly that with SignBack. Free and private by design. Apple Intelligence, Face ID, iCloud, iCloud Drive, iPad, iPhone, and Siri Shortcuts are trademarks of Apple Inc.

Screenshots

TopicFlow4 screens
SignBack4 screens

Verdict

The call

The clearest difference is in-app purchases: SignBack at none against TopicFlow's 3. TopicFlow's advantage is iOS requirement (15.0 vs 18.0). On price, rating, ratings volume and update cadence 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. TopicFlow sells 3 in-app purchases, starting at $4.99 per month. SignBack asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for TopicFlow against 5.0 for SignBack. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

TopicFlow ships an update every 9 days, SignBack every 5 days. The most recent releases landed on September 28, 2026 and September 17, 2026 respectively.

Scorecard3 real differences · 6 level
TopicFlow versus SignBack: the parameters behind the verdict, then further details
ParameterTopicFlowSignBack
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Number of ratings11
Update frequencyEvery 9 daysEvery 5 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better18.0
Further details — not scored
Size67 MB8 MB
Age rating4+4+
Developer亦君 潘Silvergrove Labs LLC

In-app purchases

3 purchases

TopicFlow

Subscriptions2
  • TopicFlow Monthly Subscription$4.991 Month
  • TopicFlow Yearly Subscription$29.991 Year
One-time1
  • TopicFlow Lifetime Access$69.99
None

SignBack

No in-app purchases

Questions

Is TopicFlow free?
TopicFlow is free to download, with in-app purchases available.
Is SignBack free?
SignBack is free to download, with no in-app purchases.
Which has better reviews, TopicFlow or SignBack?
TopicFlow and SignBack are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do TopicFlow or SignBack have ads?
Neither TopicFlow nor SignBack shows ads.
Which is updated more often, TopicFlow or SignBack?
TopicFlow ships an update every 9 days, and SignBack every 5 days. Most recently, TopicFlow was updated on September 28, 2026 and SignBack on September 17, 2026.

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