Spillmark vs LarkSim

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Spillmark compared with LarkSim
Detail	Spillmark	LarkSim
What it does	Run your Amazon store on autopilot with AI agents	UK physical SIM cards with real British phone numbers for overseas account verification
Stage	Not given	Not given
Founded	Not given	Not given
Based in	US	CN
Pricing model	Paid	Paid
Pricing	Dashboard $19/mo, Starter $49/mo (for brands spending up to $3k a month on Meta), Growth $199/mo (for brands spending over $3k a month on Meta)	giffgaff self-service card: $15 USD; giffgaff premium card with £10 credit: $43 USD; £10 official top-up voucher: $23 USD; US T-Mobile physical card: $28 USD (approximately ¥199); T-Mobile renewal top-up: ¥66–99 per month
Key features	Holdout testing for measuring true ad lift with statistical ranges Profit dashboard showing earnings by channel after fees and costs Read-only access with no automatic changes to ad accounts Locked experiment designs that cannot be edited after starting Pre-test checks showing whether tests can deliver clear answers Alert notifications for detected problems and issues Branded Amazon PPC tests on Growth plan	Real UK phone number for SMS and calls No fixed monthly fee, pay as you use Global roaming support Number preservation by maintaining activity every 6 months Chinese-language activation and recharge guidance Fast domestic shipping within 1-5 days Premium card includes £10 official top-up voucher User registers and manages own account
What makes it different	Measures true sales lift causation, not platform attribution credit Built by and tested on an actual Amazon seller's own brand Tests locked before starting with results never edited after Data never shared, pooled or benchmarked with other brands Read-only access by default with full user approval for all changes	Domestic inventory shipping within China, no cross-border wait times Real physical SIM card more authentic than VoIP virtual numbers Works in mainland China with SMS and call reception, no monthly subscription
Ships internationally	Not given	Not given
Sells online	Not given	Not given
Physical shop	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	28 no change since last check
Trust Flow (Majestic)	0	9
Citation Flow (Majestic)	0	27
Referring domains (Majestic)	0	44

6 details filled in for both companies.

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