Pay for what you use.
Own your data. Always.
Free tools stay free — every calculator, every species guide. Pro and Breeder unlock the full operating system for serious fishkeepers.
Free
Start here. Always free.
- Full species database — all 100+ species
- All 15 aquarium calculators
- AI Aquarium Assistant — 10 messages/day
- Blackwater Aquatics knowledge base
- Breeder dashboard
- Fish & pair registry
- Spawn tracking & survival analytics
- Genetics engine & lineage tree
- Water parameter logging
- CSV data export
- Public breeder profile
Pro
$79/yr — save $29
For serious fishkeepers.
- Everything in Free
- Unlimited AI Aquarium Assistant
- Full breeder dashboard
- Unlimited fish & pair registry
- Spawn tracking & survival analytics
- Genetics engine & lineage tree
- Water parameter logging & charts
- CSV data export
- Public breeder profile
- Verified breeder badge
- API access
Breeder
$199/yr — save $89
Built for professionals.
- Everything in Pro
- Public breeder profile & store page
- Verified breeder badge
- Unlimited spawns + advanced analytics
- Bulk fish import/export
- API access — read your own data
- Priority support
- Early access to new features
- Breeder directory listing
- Custom lineage export (PDF)
- Spawn result publishing
Full feature comparison
Every detail, side by side.
Trusted by the aquarium community
“The AI assistant answered a breeding question about my discus that I'd been researching for weeks. It cited specific temperature triggers and gave me a complete conditioning protocol.”
Marcus T.
Discus breeder, Ontario
“I've used every aquarium app out there. SpawnOS is the first one that actually understands water chemistry at a level that matters for serious fishkeeping.”
Sarah K.
Planted tank specialist
“The spawn tracking alone is worth the Pro subscription. I went from spreadsheets to a system that shows me survival trends across all my betta lines.”
Jordan P.
Betta breeder, BC
Questions
Do I need a credit card to start the free plan?
No. The free tier is genuinely free — no credit card, no trial expiry. You get full access to the species database, all 15 calculators, and 10 AI messages per day forever.
What happens after the 14-day Pro trial?
You'll be prompted to add a payment method. If you don't, your account drops back to the Free tier. Your data stays intact — nothing is deleted.
Can I cancel anytime?
Yes. Cancel from your account settings at any time. No cancellation fees. Annual subscribers receive a prorated refund for unused months.
What is the Breeder profile?
A public page at spawnos.app/breeders/your-name showing your fish registry, active spawns, breeding history, and a bio. It becomes your professional presence in the SpawnOS community — and ranks on Google for your name and species.
Is my breeding data private?
Yes, unless you're on the Breeder plan and choose to publish spawn results. Your fish registry, pair data, and parameter logs are private by default on all plans.
Do you offer refunds?
Monthly subscriptions: no refunds on the current month. Annual subscriptions: prorated refund within 30 days of purchase. Contact us for exceptions.
Start free.
Upgrade when you're ready.
No credit card. No expiry. Every calculator and every species guide stays free forever. Pro and Breeder are for when you're serious about your operation.