What is the Belkins.app demand-test protocol?
Belkins.app uses a fourteen-day validation window for each cohort. Products are tested with real pages, tools, and payment paths before the strongest signal earns deeper build time.
SaaS demand tests with a public kill-or-scale protocol
Each product gets a small surface area: a clear buyer, a landing page, a working interaction, and a payment path. The portfolio tracks what should scale and what should archive.
What This Page Establishes
- 16 SaaS landings are listed across 2 cohorts.
- 27 Stripe SKUs are represented across the portfolio.
- The public operating model is fourteen days per cohort: winners scale, losers archive.
- The current clusters include email deliverability, sales operations, finance operations, regulatory intelligence, and document-to-link workflows.
Products
07 / invoicegpttesting
InvoiceGPT
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.
01 / grantradartesting
GrantRadar.eu
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.
02 / stackswaptesting
StackSwap
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.
03 / patentclaimstesting
PatentClaims
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.
04 / reglawfeedtesting
RegLawFeed
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.
05 / podcastpitchtesting
PodcastPitch
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.
06 / backlinkbaittesting
BacklinkBait
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.
08 / meetingdrifttesting
MeetingDrift
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".
09 / receiptradartesting
ReceiptRadar
Receipt capture + expense categorization for SMBs and bookkeepers. Email receipts to one address, PaddleOCR'd, categorized straight into QuickBooks.
10 / folderly-solotesting
Folderly Solo
Folderly's enterprise deliverability stack repackaged for solo founders and indie consultants. 1 mailbox monitored, weekly health report, spam-trap + reputation alerts.
11 / folderly lenstesting
Folderly Lens
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.
12 / folderly flashtesting
Folderly Flash
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.
13 / peeksafetesting
PeekSafe
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.
14 / liventesting
Liven
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.
15 / trailtesting
Trail
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.
16 / liveprooftesting
LiveProof by Folderly
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.
FAQ
Are the products only mockups?
The hub distinguishes demand-test landings from working MVPs. Wave 2 includes working tools such as PeekSafe, Liven, Trail, and LiveProof.