Folderly email deliverability tools
Cold-email deliverability audits, inbox health checks, blacklist forensics, sender reputation, and outbound ROI proof.
Product Lab OS · live in 2026
Live AI product bets from Vlad, Belkins, and Folderly.
Open the working tools first, then inspect the demand tests behind them: Folderly wedges, AI ops ideas, document-to-link workflows, real URLs, buyer labels, and price anchors.
Folderly Flash30-second deliverability verdictOpen tool
LiveProofLive ROI calculator for cold emailOpen tool
PeekSafeSandboxed file previewOpen tool
shipping solo · real URLs · Stripe-priced
16landings
5working MVPs
27Stripe SKUs
2public cohorts
Start Here
The highest-signal tools are pulled from the manifest, not hand-curated HTML. Folderly Flash, LiveProof, PeekSafe, Liven, Trail, and Folderly Lens get a faster path before the full catalog.
Open
12 / folderly flashlive
Folderly Flash
30-second deliverability verdict
Send any email, get your deliverability verdict in 30 seconds — SPF/DKIM/DMARC enforcement, spam-trigger & blacklist forensics, one-click Folderly remediation. The mail-tester rewrite, on real infra. Free to test.
Open
11 / folderly lenstesting
Folderly Lens
KILL / REHAB / KEEP domain audit
External cold-email estate audit by Folderly's deliverability team. Per-domain KILL / REHAB / KEEP — the view Spamhaus already has. Same engine that ran a real 90-domain client audit. First audit free.
Open
16 / liveprooflive
LiveProof by Folderly
Live ROI calculator for cold email
Stop attaching the one-pager. Drop a live ROI calculator into cold email — your prospect drags their own numbers and sells themselves. Lead capture on every drag.
Open
13 / peeksafelive
PeekSafe
Sandboxed file preview
Never open a stranger's attachment again. Preview any file — PDF, deck, spreadsheet — as a safe, sandboxed, beautiful link. No download, no macros ever run. Free to start.
Open
14 / livenlive
Liven
PDF rebuilt as a living page
Your PDF is dead on arrival. Liven rebuilds any deck or report as a living interactive page — tabs, animated numbers, hover-able charts. You send a link, not a 12MB attachment.
Open
15 / traillive
Trail
Tracked link engagement dashboard
DocSend for living documents. Host any interactive artifact at one tracked link — see who opened it, which tab they clicked, and the moment they hit book-a-call.
Product Catalog
Experiments
Wave 1 and the Folderly wedge products are listed as the core demand-test catalog: clear buyer, public URL, pricing anchor, and a narrow promise.
Open
07 / invoicegpttesting
InvoiceGPT
Gmail-ready payment nudges
Voice-cloned overdue-invoice nudges for freelancers. Trained on 5 of your real emails — drafts Day +7 / +14 / +30 in your tone, lands in Gmail Drafts for one-click send.
Open
01 / grantradartesting
GrantRadar.eu
Grant alerts matched to your CV
EU grant discovery matched against your CV — Horizon, EIC, ERC, MSCA, BMBF, NCN. Weekly digest of ≥80% fit alerts so you stop missing deadlines you didn't know existed.
Open
02 / stackswaptesting
StackSwap
Cross-cloud savings audit
Cross-cloud cost arbitrage for AWS / GCP / Azure. Surfaces the top 10 SKUs you could move to Hetzner / Cloudflare / DO with one click. Free first audit.
Open
03 / patentclaimstesting
PatentClaims
Claim diffs and prior-art surfacing
Patent claim diffing + prior-art surfacing built on the USPTO ODP corpus. For solo inventors and early-stage startups who can't afford $400/hr counsel for every filing.
Open
04 / reglawfeedtesting
RegLawFeed
Regulatory diffs that affect shipping
Daily regulatory diffs across FAA UASFM, CFPB, EU GDPR DPA, FDA Devices, FTC. Severity-gated Slack digest — only the things that change what you can ship.
Open
05 / podcastpitchtesting
PodcastPitch
Podcast matches with grounded openers
Targeted podcast pitches scored against host history. 30 matches/mo, custom opener per match grounded in real episode quotes — written to actually get a yes.
Open
06 / backlinkbaittesting
BacklinkBait
Weekly linkable-asset prospects
Linkable-asset discovery for SEO teams. 50 fresh prospects/week across 4 source feeds, with a pre-written opener per prospect. Built for niches HARO ignores.
Open
08 / meetingdrifttesting
MeetingDrift
Recurring meetings to kill
Detects when recurring meetings have lost their purpose. Chrome extension scores every event on your calendar and sends a Friday Slack digest of "kill these".
Open
09 / receiptradartesting
ReceiptRadar
Receipts categorized into QuickBooks
Receipt capture + expense categorization for SMBs and bookkeepers. Email receipts to one address, PaddleOCR'd, categorized straight into QuickBooks.
Open
10 / folderly-solotesting
Folderly Solo
Mailbox health and reputation alerts
Folderly's enterprise deliverability stack repackaged for solo founders and indie consultants. 1 mailbox monitored, weekly health report, spam-trap + reputation alerts.
Open
11 / folderly lenstesting
Folderly Lens
KILL / REHAB / KEEP domain audit
External cold-email estate audit by Folderly's deliverability team. Per-domain KILL / REHAB / KEEP — the view Spamhaus already has. Same engine that ran a real 90-domain client audit. First audit free.
Open
12 / folderly flashlive
Folderly Flash
30-second deliverability verdict
Send any email, get your deliverability verdict in 30 seconds — SPF/DKIM/DMARC enforcement, spam-trigger & blacklist forensics, one-click Folderly remediation. The mail-tester rewrite, on real infra. Free to test.
Wave 2 · HTML-ilization
The second wave turns static documents into safer, trackable, interactive web surfaces: preview, rebuild, host, track, and prove.
Open
13 / peeksafelive
PeekSafe
Sandboxed file preview
Never open a stranger's attachment again. Preview any file — PDF, deck, spreadsheet — as a safe, sandboxed, beautiful link. No download, no macros ever run. Free to start.
Open
14 / livenlive
Liven
PDF rebuilt as a living page
Your PDF is dead on arrival. Liven rebuilds any deck or report as a living interactive page — tabs, animated numbers, hover-able charts. You send a link, not a 12MB attachment.
Open
15 / traillive
Trail
Tracked link engagement dashboard
DocSend for living documents. Host any interactive artifact at one tracked link — see who opened it, which tab they clicked, and the moment they hit book-a-call.
Open
16 / liveprooflive
LiveProof by Folderly
Live ROI calculator for cold email
Stop attaching the one-pager. Drop a live ROI calculator into cold email — your prospect drags their own numbers and sells themselves. Lead capture on every drag.
Source Facts
- Canonical entity
- Belkins.app is a public product-lab portfolio by Vladyslav Podoliako, the founder and CEO of Belkins and co-founder of Folderly.
- Current catalog
- The hub lists 16 non-external SaaS landings across 2 cohorts, with 27 Stripe SKUs and 6 related venture/profile links.
- Folderly cluster
- Folderly Solo, Folderly Lens, Folderly Flash, and LiveProof by Folderly are positioned as smaller deliverability and outbound-conversion tools inside the lab.
- Validation model
- Each product is framed around a fourteen-day demand-test protocol: real landing, working interaction, payment path, then kill-or-scale decision.
Topic Clusters
AI sales and marketing operations
Tools for overdue invoices, podcast guest pitching, journalist-source requests, meetings, and outbound workflows.
Research and regulatory intelligence
Grant discovery, patent claim analysis, and regulatory-change monitoring for teams that need precise alerts.
Document-to-link workflows
File preview, living reports, tracked documents, and interactive proof assets for teams that still send attachments.
FAQ
What is Belkins.app?
Belkins.app is Vladyslav Podoliako's public product lab and portfolio showcase for Folderly mini-products, AI SaaS experiments, working MVPs, and bootstrap demand tests.
Who runs Belkins.app?
The portfolio is run by Vladyslav Podoliako, founder and CEO of Belkins and co-founder of Folderly.
Which Folderly mini-products are listed?
The Folderly cluster includes Folderly Solo, Folderly Lens, Folderly Flash, and LiveProof by Folderly.
How does the product-lab model work?
Each idea gets a focused validation surface: a real landing page, a working interaction, a payment path, and a fourteen-day kill-or-scale decision.
Are the products only ideas?
No. Some entries are demand tests, while Wave 2 includes working MVPs such as PeekSafe, Liven, Trail, and LiveProof.
What else I'm working on
These entities establish the public context around the product lab: Belkins, Folderly, Folderly AI, LinguaLive, the personal site, and the newsletter.
belkins.ioventure
Belkins
Outbound lead-generation agency
Co-founder & CEO. B2B outbound lead-generation agency. 9 years, 1000+ clients, the work that bought me the right to ship these experiments on my own dime.
folderly.comventure
Folderly
Email deliverability platform
Co-founder. Email deliverability SaaS — fixes inbox placement so your outbound actually reaches replies. Trusted by 1000+ B2B teams. Folderly Solo (above) is the indie SKU.
generate.folderly.comlive
Folderly AI
AI cold-email generator
AI email generator built on Folderly's deliverability stack. Drafts cold openers trained on what actually lands in inbox and earns a reply. Free to try.
lingualive · ioslive
LinguaLive
Voice-first iOS tutor
AI language tutor for iPhone. Voice-first, real-time conversation practice, personalized lessons. Shipped solo, live on the App Store.
vladyslavpodoliako.compersonal
Vlad Podoliako
Personal site and writing
My personal site — bio, writing, talks, things I've shipped. Start here if you want the long-form version of who's behind the experiments.
vladsnewsletter.comwriting
Vlad's Newsletter
Weekly product lab notes
Weekly: what I'm building, what I killed, what I learned. AI products, bootstrap economics, the unglamorous parts of running ventures while shipping side bets.