# OnlyMonster vs Substy: Honest OnlyFans CRM Comparison (2026)

OnlyMonster is a multi-platform CRM with a public API and pricing from $30. Substy is a Fanvue-ready autonomous AI seller with a sales commission.

Canonical: https://outseeker.net/vs/onlymonster-vs-substy
Source: Outseeker (outseeker.net)

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> Pick OnlyMonster for a multi-platform operation that wants transparent per-account pricing and a real public API, with a rate you can lock by prepaying. Pick Substy only if you want an autonomous AI closing PPV on its own and can accept its sales commission, thin trust record, and Fansly gap.

OnlyMonster is a full management platform in its own desktop browser: chatting console, vault, chatter permissions, and a documented public REST API. Substy is a browser CRM built around an autonomous AI seller that runs the inbox 24/7 and routes whales to humans.

Platforms cut differently here. OnlyMonster covers OnlyFans, Fansly, Fanvue, Reddit, LoyalFans, and more. Substy runs OnlyFans and Fanvue live, with Fansly unsupported and MYM coming soon. Both carry a catch: OnlyMonster's independent review trail is thin, roughly one Trustpilot review, and Substy sits near 2.9 on refund complaints.

## At a glance

| | OnlyMonster | Substy |
| --- | --- | --- |
| Price from | From $30/mo per account | Free, then $69/mo per creator |
| Best for | Budget multi-platform API-driven agencies | Agencies wanting autonomous AI selling |
| Platforms | OnlyFans, Fansly, Fanvue, more | OnlyFans, Fanvue, more |
| Free trial | A 7-day free trial with no credit card required per the homepage, including 100 AI credits per the pricing docs. | A free 'Starter' plan at $0/month indefinitely (15% commission on AI sales, unlimited creators), with paid Pro and Elite plans including a one-week free trial. |

## Pricing

OnlyMonster prices per account. OnlyFans is dynamic, read off that account's trailing 30-day earnings across seven bands from $30 to $250/mo. Every non-OnlyFans platform is a flat $30/mo each. Prepay 3 or 6 months and you lock the rate before a page climbs a band.

Substy is subscription plus commission on AI sales: Starter $0 at 15%, Pro $69 per creator/mo at 10%, Elite $99 per creator/mo at 8.5%. Note the contradiction, the page bills per creator while marketing claims one flat rate. Work a number. Run 5 OnlyFans pages in the $30 band on OnlyMonster and that is 5 x $30 = $150/mo, fixed. On Substy Pro that is 5 x $69 = $345/mo, and if the AI books $8,000, add 10% = $800, so the real bill is $1,145. The commission grows with sales, not headcount.

## Feature comparison

| Feature | OnlyMonster | Substy |
| --- | --- | --- |
| Chatting console | Yes — A unified chatting console/inbox for fan interactions inside its dedicated OnlyMonster Browser. | Yes — A browser-based chat interface with a split inbox and automatic chatter assignment. |
| AI replies | Yes — AI Smart Replies, AI Auto-Generate, and AI Monster Translate, consuming a monthly AI-credit allocation. | Yes — An autonomous AI chatbot that runs 24/7, remembers each fan, adapts tone/language, and sells PPV; Slow/Normal/Aggressive modes plus a hybrid AI-plus-human mode. |
| Mass DM | Yes — Mass DM / bulk messaging is listed among the core features on the homepage. | Yes — Mass DM with dynamic lists, included starting on the Pro plan. |
| Analytics | Yes — Analytics dashboards, AI Chat Analysis, Fan Scoring, and chatter-performance monitoring, though third-party reviews call the reporting depth basic. | Yes — A centralized dashboard tracks revenue, conversions, AI performance, and per-model metrics; campaign and fan-level analytics are provided. |
| Chatter management | Yes — Team/employee management with role assignment, access-control permissions, and per-chatter performance/sales tracking. | Yes — Add chatters with custom access levels and monitor per-chatter performance (sales count, response rates, conversion) in real time. |
| Media vault | Yes — A media vault, with a documented API endpoint for uploading media to the OnlyFans vault via presigned S3 URLs. | Unknown — A media/content vault could not be confirmed or denied on any accessed page. |
| Saved scripts | Yes — Saved scripts and reply templates (canned messages) in the chatting console. | Yes — Customizable message scripts/templates define tone and negotiation style; scripts can be imported from other CRMs such as Infloww. |
| Tracking links | Yes — Tracking links and trial links, with dedicated API endpoints for tracking links, trial links, and chargebacks. | Yes — Integrated tracking links attribute traffic by channel (TikTok, Reddit, Telegram, etc.); included on the Elite plan. |
| API / integrations | Yes — A public, documented REST API (production endpoint omapi.onlymonster.ai) with an OpenAPI reference, webhooks, a 25 req/s rate limit, and endpoints for accounts, chats, messages, transactions, members, and vault folders. | Unknown — No public API or webhooks documented; only one-way data import/migration from competitors like Infloww is mentioned. |

## Choose OnlyMonster if

- The creators you manage span OnlyFans, Fansly, Fanvue, and Reddit, and you want one console covering all of them.
- You need to wire the CRM into your stack: OnlyMonster ships a documented REST API with webhooks and a 25 req/s limit.
- You want billing you can forecast and lock by prepaying 3 or 6 months before a page grows into a higher band.

## Choose Substy if

- You want an AI that sends and closes PPV on its own, in Slow, Normal, or Aggressive mode.
- You want hybrid routing that hands a fan to a human once they cross a spend threshold, Substy's example being $40.
- You want to start free on the $0 Starter tier and pay almost nothing until the AI earns.

## FAQ

### How is OnlyMonster's OnlyFans price set?

It is dynamic, read off the account's trailing 30-day earnings across seven bands from $30 to $250/mo. Non-OnlyFans platforms are a flat $30/mo each.

### What does Substy actually cost?

Two parts. Subscription is $0, $69, or $99 per creator/mo, plus a commission on AI sales of 15%, 10%, or 8.5%. Pro is never just $69, it is $69 plus a tenth of everything the AI sells.

### Which one covers more platforms?

OnlyMonster, by a wide margin: OnlyFans, Fansly, Fanvue, Reddit, LoyalFans, Subs, Telegram, and TXT. Substy runs OnlyFans and Fanvue only, with Fansly unsupported.

### Is Substy safe to trust?

Be cautious. It sits near 2.9 on Trustpilot from two reviews, with complaints of refused refunds and charges after cancellation. Test the free Starter and get terms in writing first.

## Sources

- [Official homepage. Feature list, supported platforms, 7-day trial no-card claim.](https://onlymonster.ai/)
- [Official docs. Seven OnlyFans earnings tiers with monthly/3mo/6mo prices, flat $30 other-platform rate, AI-credit allocations, rate-lock note.](https://docs.onlymonster.ai/billing-and-pricing/plans-and-pricing)
- [Official API docs. Public OpenAPI, production endpoint, rate limits, endpoints for accounts/chats/messages/tracking links/transactions/vault.](https://docs.onlymonster.ai/integrations-and-api/openapi)
- [Trustpilot. Very thin sample (about one review).](https://www.trustpilot.com/review/onlymonster.ai)
- [Homepage. Positioning, live platforms (OnlyFans/Fanvue live, MYM coming soon), core features.](https://substy.ai/)
- [Pricing page. Starter $0/15%, Pro $69 per creator/10%, Elite $99 per creator/8.5%, 25% annual discount, one-week trial, 'per creator' wording.](https://substy.ai/pricing)
- [AI chatbot page. Autonomous replies, hybrid mode with $40 threshold, multilingual, scripts/tone modes, PPV selling.](https://substy.ai/features/ai-chat)
- [Trustpilot. Around 2.9 rating, 2 reviews; complaints on AI reliability, support, refunds, post-cancellation charges.](https://www.trustpilot.com/review/substy.ai)

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_Source: [outseeker.net](https://outseeker.net/vs/onlymonster-vs-substy) — machine-readable Markdown version of this page._