Mastros is worth it if your job is exporting lists, chats and media from Telegram, WhatsApp, LinkedIn, Instagram or TikTok into a file you can open, and you want it done in your own browser with no API key, no cookie handed to a server and nothing sent from your account. It is not worth it if you want bulk messaging, scheduled cloud jobs, hidden phone numbers or emails the platform does not show. This page lays out the plans, the limits, all the store reviews including the critical ones, and the cases where the answer is no.
What does Mastros do?
Five Chrome extensions, one per platform, that read what your logged-in tab shows and export it: group members, messages, contacts and media on Telegram; group members, contacts, chats and media on WhatsApp; search results, Sales Navigator lists and profiles on LinkedIn; followers, following, comments, bio emails and engagement rate on Instagram; comments, creators, bio emails and engagement rate on TikTok. Output is CSV, JSON or JSONL, plus XLSX on Instagram; the CSV opens in Excel and Google Sheets. Everything runs client-side.
What does Mastros not do?
It sends no messages, adds nobody to groups, follows nobody, likes nothing and never runs while you are away. It does not reveal phone numbers or emails the platform hides, does not scrape accounts you cannot see, does not run on a schedule, and does not export TikTok follower lists, because TikTok shows none. If any of those is the feature you need, a different category of tool is the honest recommendation: see Best Telegram scrapers 2026 and the Apify and Phantombuster pages for who does what.
What is free and what is paid?
Each extension has a free tier with monthly export limits, and Pro and Scale plans that raise them. Instagram and TikTok are free at launch. The exact numbers and prices are on each product page and change with the plans, so this post links rather than repeats: Telegram, WhatsApp, LinkedIn. Plans are monthly and cancel any time.
What do the reviews say?
As of September 8, 2026 the three paid extensions have 152 ratings on the Chrome Web Store: Telegram 4.9 from 71, WhatsApp 5.0 from 47, LinkedIn 5.0 from 34. One hundred and fifty of those ratings carry written text, and all of them are in the reviews data file this page draws from. Below are ten, quoted exactly as written, chosen to include the ones that name a limitation. Reviews left by the developer's own accounts are excluded everywhere on this site.
"The dev fixed the problem and was kind enough to stop the charges and offer a refund. Happy to report that the extension seems to be working fine now and looks like there are more features added. " Ralf Lan, Telegram, 5 stars, July 21, 2026
"It does the job very well, I don't usually leave comments but I am impressed already. UI/UX can be polished but its not a concern for me. 2 hours of work is now only 15 mins." Ozan, Telegram, 5 stars, June 5, 2026
"Clicking through LinkedIn results and pasting them into a spreadsheet was wasting my evenings. Mastros does exactly what the description promises. The export is clean, and the local-only processing gives me peace of mind. Just note that the free tier has limits, and you only get what's visible on the page. I'll keep it for the weekly batch exports." kk ss, LinkedIn, 5 stars, August 21, 2026
"Its main limitation is important: it can only export data that WhatsApp Web has already loaded and displayed. It cannot reveal hidden phone numbers, access chats you don't have permission to view, or retrieve an entire conversation beyond the currently loaded history. It is also read-only—it doesn't send messages, add contacts, or automate WhatsApp actions." pathan boks, WhatsApp, 5 stars, August 23, 2026
"Mastros makes exporting Telegram data feel much more organized than manually copying messages or member details. I like the range of options, especially chat exports, contacts, mutual groups, and original-quality media downloads. The controlled extraction approach is also a thoughtful touch. Monthly limits on the free plan may be restrictive for heavier use, but overall it seems practical for backups and research." Md.Shamim Islam, Telegram, 5 stars, August 30, 2026
"Honestly didn't expect much. Most Telegram tools I've tried before are either sketchy bots that get my account flagged, broken Python scripts on GitHub, or weird desktop apps asking for permissions I'd never grant. So when I found this Telegram scraper as a Chrome extension I figured I'd test it on a throwaway account first. I'm now using it on my main one.
What sold me: it just runs in the browser. No login wall, no separate server, nothing leaving my machine. Pulled members from a few of my mutual Telegram groups, deduped, exported to CSV. Used the same contact list the next morning for outbound outreach to a niche I'd been trying to break into for months. Two of them replied within the hour.
If you're doing any kind of Telegram lead generation, prospecting, or community-driven sales, just install it. Simplest Telegram members extractor I've found in a category where most things either don't work or get your account banned." Marco Max, Telegram, 5 stars, May 10, 2026
"I tested Mastros with both LinkedIn People Search and Jobs Search It successfully detected the results and exported the data into a structured file with useful fields such as names, job titles, companies, locations, profile urls, and job URLs. The exported data matched the visible search results, and the process was straightforward." Kareem Abdelaleem, LinkedIn, 5 stars, August 23, 2026
"Honestly much easier than I expected. Exported my Sales Nav search and had the CSV ready in like 2 mins." Sam Gab, LinkedIn, 5 stars, August 6, 2026
"I needed to pull our massive community member list into a spreadsheet for our new CRM, and this tool perfectly extracted hundreds of contacts with zero setup or messy API keys." Niamat Ullah, WhatsApp, 5 stars, August 22, 2026
"Was scraping Telegram groups manually for outbound and wasting hours every week on it. This solved the problem in one afternoon. CSV export is clean and plugs straight into my CRM workflow." Monica Enas, Telegram, 5 stars, May 8, 2026
What the caveat reviews have in common: the Telegram rating is 4.9 rather than 5.0 because of a single low rating on the store, and inside the 5-star reviews the same three caveats recur, and they are true: the free tier has monthly limits, exports contain only what the page has loaded and shows you, and the interface is plainer than the exports. One July review describes a billing problem that was fixed with a refund. That is the part of this page to trust most.
Who should not buy Mastros?
Marketing teams whose plan is to message everyone on the exported list; the export is the safe half and the messaging is what gets accounts limited, on every platform. Developers who need an API or a nightly pipeline. Anyone expecting emails from LinkedIn or hidden numbers from WhatsApp. Anyone on mobile only, since Chrome extensions run on computers.
Who gets the most out of it?
Community managers exporting their own groups, recruiters and salespeople turning searches into spreadsheets, researchers pulling comments for analysis, agencies vetting creators by real engagement rate, and anyone keeping a copy of a chat they care about. The reviews above are those people.
How is Mastros different from the alternatives?
Cloud scrapers reach further and run unattended; outreach suites collect and act; Mastros reads and exports. That is a narrower job and a lower-risk one, and it is priced as a flat monthly plan rather than per result or per hour. The comparison posts linked above lay out each competitor's case fairly.
FAQ
Is Mastros safe?
It runs in your browser on the page you are logged into, sends nothing from your account and holds no password or cookie. The risk that remains is the one every export carries: what you do with the file.
Does Mastros work on Mac?
Yes, anywhere Chrome runs.
Can I try it before paying?
Yes, every extension has a free tier.
Does Mastros get accounts banned?
Reading is not what platforms act on; bulk messaging and mass actions are, and Mastros does neither.
Is there a refund?
Ask at admin@mastros.online. The Terms page states the policy; the July 2026 review above is one case where a charge was stopped and refunded.
Who makes Mastros?
Elias Mahdavi, a solo developer. See About.