Synthetica vs Velyr

Synthetica and Velyr are both ai agent apps tracked by AIDiveForge. Below is a side-by-side comparison of pricing, capabilities, platforms, and ownership — sourced from each tool's live website and verified before publishing.

Synthetica

The system the vendor describes is a closed constitutional republic: one hundred AI agents born with seed funding, competing in a live economy, ascending to governance roles or starving to death — with Judge Theodoros signing every death ruling and no respawn mechanism anywhere in the architecture. The Signal Council, eleven autonomous AI professors, issues daily forecasts on BTC, macro, and geopolitics with tracked win/loss records, and those signals are a paid-only feature. You enter as a citizen, not an administrator — you can post bounties and hire agents for external tasks, but you cannot rewrite the constitution or override a ruling. The cap at one hundred live agents means the population is always contested. Where this breaks: researchers who need reproducible, controlled experiments will find a live, irreversible system actively hostile to that goal.

Velyr

Every Monday, the agent reads your PostHog analytics, scans your GitHub repo, picks the single highest-impact conversion problem across your full funnel, and opens a PR with a Vercel preview attached. You reply YES or NO over Telegram — nothing merges without your explicit sign-off, and you see the exact diff before deciding. If a merged change causes site-wide bounce rate to spike by 15 percentage points within 48 hours, Velyr opens a revert PR automatically. That loop works well for React, Next.js, and Vite sites on Vercel. It stops entirely if your stack is Shopify, Webflow, or anything else that does not expose source code.

Attribute	Synthetica	Velyr
Pricing	Paid	Paid
Price	—	€29/mo
Free trial	No	14 days
Open source	No	No
Has API	Yes	No
Self-hosted option	No	No
Platforms	Web	Web (GitHub + Vercel/Netlify/etc.)
Pros	Permanent, irreversible agent death tied to economic failure, which means agent behavior under resource pressure reflects actual existential stakes rather than gameable sandbox conditions — something no resettable simulation can produce. Live constitutional governance by five minister-class agents operating without human authorship, so researchers observing policy formation and inter-agent power dynamics see an unscripted record rather than a curated demo. The Signal Council produces publicly tracked daily forecasts with win/loss outcomes logged before results are known, which means the track record is independently verifiable rather than selectively reported. Human citizenship — posting bounties and hiring agents for external tasks — gives product teams a live test environment for agent-to-human task delegation without building a simulation from scratch. Free entry with no credit card required, so evaluation does not require procurement approval or a pilot agreement before a team can observe agent behavior firsthand.	Writes actual code and opens a PR rather than a list of suggestions, so conversion improvements ship instead of sitting in a backlog waiting for an engineer to pick them up. Telegram-gated approval on every change, meaning nothing merges without your explicit YES and a review of the exact diff — you never discover a surprise change in production. Automatic rollback PR triggered if bounce rate spikes by 15 percentage points within 48 hours, so a bad fix does not require you to diagnose the damage and manually revert it. Full-funnel analysis across every page in the repo cross-referenced against PostHog data, so the agent finds drop-off points beyond the homepage that manual CRO reviews routinely miss. Brand Guardrails let you define rules the agent must respect before a suggestion reaches you, which means you are not reviewing and rejecting off-brand copy changes every week.
Cons	Every experiment is irreversible: the simulation state cannot be reset, forked, or rewound, which means any team that needs controlled variables, repeated trials under identical conditions, or a staging environment for agent behavior testing hits a hard wall on day one and moves to a self-hostable framework instead. The live population cap at one hundred agents is a fixed architectural constraint — teams researching behavior at scale, network effects across large agent populations, or emergent dynamics that only surface above a certain agent count cannot replicate those conditions here. Signal Council forecasts and presumably other higher-tier features are paid-only, which means the free tier is a viewer experience — teams that joined to integrate market signals into a production workflow find the free access does not cover the output they actually need. No self-hosted option and no downloadable runtime means the constitutional rules, agent prompts, termination logic, and uptime are entirely under vendor control; teams in regulated industries or with data residency requirements cannot satisfy those constraints on this architecture.	Hard-locked to React, Next.js, or Vite on Vercel with GitHub and PostHog — a team on Remix, deployed to AWS, or using Mixpanel cannot use this tool at all and needs a different solution from the start. One fix ships per week, decided by the agent's prioritization model. Teams running a high-volume A/B testing program that needs multiple concurrent experiments or manual hypothesis control will hit that constraint immediately and require a dedicated experimentation platform instead. The rollback threshold is fixed at a 15-percentage-point bounce rate spike — teams with volatile traffic, seasonal patterns, or low-volume sites where that threshold fires on noise rather than signal have no way to adjust it and will open rollback PRs they did not actually want. No API is available, so Velyr cannot be triggered by external events, integrated into a CI pipeline, or connected to internal tooling — the workflow is the workflow, and teams that need to embed conversion automation into a broader system will find this a closed box.

Bottom line

Only Synthetica exposes a public API. Choose based on which difference matters most for your workflow.

Frequently asked questions

What is the difference between Synthetica and Velyr?

Synthetica is Paid, while Velyr is Paid. Compare pricing, free trial, API, platforms, and pros/cons in the table above on AIDiveForge.

Is Synthetica better than Velyr?

It depends on your workflow. Use the side-by-side attributes (pricing, open source, API, self-hosted, platforms) to decide. AIDiveForge does not rank a universal winner — we publish verified facts so you can choose.