V belkins.app
14-day validation protocol

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.

16 products updated 2026-05-26 belkins.app home

What This Page Establishes

entity facts · answer-ready
  • 16 SaaS landings are listed across 2 cohorts.
  • 27 Stripe SKUs are represented across the portfolio.
  • 5 working MVPs or live tools are listed in the catalog.
  • The current clusters include email deliverability, sales operations, finance operations, regulatory intelligence, and document-to-link workflows.

Products

16 entries
InvoiceGPT landing page with overdue-invoice email workflow preview Open
07 / invoicegpttesting

InvoiceGPT

freelancersAI ops

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.

GrantRadar landing page showing EU grant discovery positioning Open
01 / grantradartesting

GrantRadar.eu

researchersResearch

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.

StackSwap landing page with cloud cost-arbitrage calculator preview Open
02 / stackswaptesting

StackSwap

cloud buyersAI ops

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.

PatentClaims landing page showing patent claim similarity positioning Open
03 / patentclaimstesting

PatentClaims

inventorsResearch

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.

RegLawFeed landing page with regulatory-change monitoring promise Open
04 / reglawfeedtesting

RegLawFeed

operatorsResearch

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.

PodcastPitch landing page with podcast outreach matching promise Open
05 / podcastpitchtesting

PodcastPitch

foundersAI ops

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.

BacklinkBait landing page with SEO linkable-asset discovery pitch Open
06 / backlinkbaittesting

BacklinkBait

SEO teamsAI ops

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.

MeetingDrift landing page with recurring meeting drift score preview Open
08 / meetingdrifttesting

MeetingDrift

chiefs of staffAI ops

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".

ReceiptRadar landing page with receipt capture and expense categorization preview Open
09 / receiptradartesting

ReceiptRadar

SMBsAI ops

Receipts categorized into QuickBooks

Receipt capture + expense categorization for SMBs and bookkeepers. Email receipts to one address, PaddleOCR'd, categorized straight into QuickBooks.

Folderly Solo landing page showing mailbox deliverability monitoring offer Open
10 / folderly-solotesting

Folderly Solo

solo foundersFolderly

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.

Folderly Lens landing page with cold-email estate audit positioning Open
11 / folderly lenstesting

Folderly Lens

agenciesFolderly

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.

Folderly Flash landing page with email deliverability verdict workflow Open
12 / folderly flashlive

Folderly Flash

outbound teamsFolderly

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.

PeekSafe landing page with sandboxed file preview tool Open
13 / peeksafelive

PeekSafe

operatorsDocument-to-link

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.

Liven landing page with static document to living page conversion demo Open
14 / livenlive

Liven

sellersDocument-to-link

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.

Trail landing page with tracked document link dashboard preview Open
15 / traillive

Trail

foundersDocument-to-link

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.

LiveProof landing page with interactive ROI calculator for cold email Open
16 / liveprooflive

LiveProof by Folderly

outbound teamsDocument-to-link

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.

FAQ

plain answers · citation-ready

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.

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.