OpenViewer vs brainmate by Brain M8
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OpenViewer
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OpenViewer is a lightweight viewer for all standard document formats. [Supported formats] PDF · HWP · DOCX · XLSX · PPTX · EPUB · TXT · Images [Key features] • Fast launch • Dark mode • Recent files + favorites • 100% on-device processing • Native HWP support for Korean documents [Why OpenViewer?] - No in-app purchases - No account required - Ad-supported (no ads inside viewer) - English, Korean, Japanese UI Contact: wowpia0127@gmail.com
brainmate by Brain M8
This AI-powered productivity tool acts as your second brain, remembering key details about people, companies, and projects. It helps you stay organized with smart reminders and a daily pulse check, all while keeping your data secure and accessible.
- AI-powered note-taking and organization
- Daily pulse for attention management
- Plain markdown notes with interlinking
- Follow-through reminders
- Secure data storage and export
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Your AI second brain for business. brainmate remembers the people, companies, and projects you tell it about — and asks about the things you haven't mentioned lately. Talk to it like a colleague. It files what matters into an organized workspace of notes you can browse, search, and export anytime. No prompt engineering, no setup, no learning curve. WHAT IT DOES - Chat that captures: mention a person, a deal, a deadline — brainmate writes it down in the right place and confirms what it saved. - Daily Pulse: a short check-in that surfaces what needs attention — stale relationships, open loops, questions worth answering. - A real workspace: every note is plain markdown with links between people, companies, and projects. Browse it, search it, export the whole thing whenever you want. - Reminders that follow through: ask for a nudge and it shows up — completing it updates your notes too. BUILT FOR BUSINESS OWNERS No dashboards to configure. No fields to fill in. You talk; it organizes. It's the assistant that actually remembers last month. YOUR DATA, YOURS Notes are stored securely and belong to you. AI features run only with your consent and can be turned off in Settings. Export everything, anytime. brainmate Solo is $29.99/month after a 2-week free trial. Cancel anytime. Already subscribed on the web? Sign in — no second purchase needed. Terms of Service: https://brainm8.ai/terms Privacy Policy: https://brainm8.ai/privacy
Screenshots
Verdict
The clearest difference is ads: brainmate by Brain M8 at none against OpenViewer's shown. brainmate by Brain M8 also leads on update cadence (every 8 days vs every 2 months). OpenViewer's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 18.0). On price and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
OpenViewer ships an update every 2 months, brainmate by Brain M8 every 8 days. The most recent releases landed on October 2, 2026 and October 6, 2026 respectively.
| Parameter | OpenViewer | brainmate by Brain M8 |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 2 months | Every 8 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | — | Subscription |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.1 — better | 18.0 |
| Further details — not scored | ||
| Size | 41 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | BongJun Park | Brain M8 LLC |
In-app purchases
OpenViewer
No in-app purchases
brainmate by Brain M8
No in-app purchases
Questions
Is OpenViewer free?
Is brainmate by Brain M8 free?
Do OpenViewer or brainmate by Brain M8 have ads?
Which is updated more often, OpenViewer or brainmate by Brain M8?
Other comparisons
